Telenetics 56 manual

Global Carrier 56 Modem User ’ s Guide 0049-2200-001 Rev . A[...]

Page ii The products and programs described in this User ’ s Guide are licensed products of T elenetics Corporation. This User’ s Guide contains proprietary information protected by copyright, and this User ’ s Guide and all accompanying hardware and documentation are copyrighted. T elenetics Corporation does not warrant that the hardware wil[...]

Page iii Cont act Information Please contact T elenetics for help, information, sales inquiries, or to join the T elenetics Mailing List. T echnical Support e-mail: support@telenetics.com W e b Pa ge : http://www .telenetics.com Phone: (949) 455-4000 Fax: (949) 455-4010 Mailing List For the latest sales and technical information, subscribe to the T[...]

Page iv Contents Introduction .................................................................................................................................... 8 Installation ...................................................................................................................................... 9 Unpacking Y our Hardware ..........[...]

Page v A TX Extended Response Codes ........................................................................................ 10 6 A TZn Restore Configuration Profile .................................................................................... 10 8 A T&B Character Length ...................................................................[...]

Page vi A T%T DCD Override ........................................................................................................... 16 4 A T%U V .42 Response Codes ............................................................................................. 1 65 A T%W Welcome Message ..............................................................[...]

Page vii A TS30 Inactivity T imer ........................................................................................................ 2 24 A TS33 EQM Threshold V alue .............................................................................................. 2 26 A TS38 Disconnect Delay ......................................................[...]

Page 8 Introduction W elcome to the Global Carrier 56 User Guide, a comprehensive guide to the efficient use of your modem. T ogether with the Read Me First Guide supplied with your modem, this reference manual provides all the information needed to make maximum use of your equipment and software. The Global Carrier 56 User Guide is divided into th[...]

Installation Page 9 Inst allation Unp acking Y our Hardware Y our package should include: • The Global Carrier 56 modem • An RJ-11 telephone-line cable • A power supply module • A DTE DB25 data cable • This User ’ s Guide If your package contents are damaged or missing, please contact your place of purchase immediately . Additional Item[...]

Page 10 T elco/Dial Line T elephone Set DTE RS232 Connector Low V oltage Power Input ON/OFF Hardware Overview Back V iew The following figure shows the back view of the Global Carrier 56 modem. Starting from the left side, this view shows: • A line jack for connecting the modem to the communications line. • An audio jack for leased-line operati[...]

Installation Page 11 Installation Summary The modem installation involves the following steps: 1. Finding a suitable location for the modem. See the section below . 2. Making the necessary modem connections. See page 12. 3. Installing the modem driver . See page 13. Finding a Suitable Location The location you select for your modem should provide e[...]

Page 12 Connecting the Cables 1. T urn off your computer . 2. Plug the data cable's male end (pins showing) into the connector marked RS232 at the back of your Modem and then plug the female end (no pins showing) of the same cable into the COM port at the back of your computer . 3. Y our computer's COM port could be 9 pins or 25 pins. Use[...]

Installation Page 13 Windows 98 1. Please insert the driver CD supplied and, when the "Found New Hardware Wizard" recognises the new Modem, click Next to search for the driver . 2. Select the "Search for the best driver your device. [Recommended]" and click "Next" to continue. 3. Select the "Specify a location&quo[...]

Page 14 Modem LED Display ☞ When your modem is using V .90, the Front Panel Mode LEDs will display the speed closest to the K56flex speed. Transmit Data (TXD) LED will flash when the modem is sending data. Receive Data (RXD) LED will flash when the modem is transferring data from the remote to the local computer . Off-Hook LED will glow when the [...]

Installation Page 15 Front Panel Mode LEDs Line Modulation O n e T wo Three Four K56flex 56000 bps ✺ M ✺ M ❍❍ K56flex 54000 bps ✺ M ✺ M ●❍ K56flex 52000 bps ✺ M ❍❍❍ K56flex 50000 bps ✺ M ●❍❍ K56flex 48000 bps ✺ M ❍● ❍ K56flex 46000 bps ✺ M ●● ❍ K56flex 44000 bps ❍❍❍❍ K56flex 42000 bps ●❍?[...]

Page 16 The A T Commands The A T commands are a group of special commands recognised by your modem. These commands derive their name from the letters A T , which are used to prefix commands. Before continuing: • Run your communications software and enter local mode (or terminal mode) at 38,400 bps Refer to your communication software manual for d[...]

A T Commands Page 17 • T ype: A T&T1 <E> The modem will enter on-line state (this command actually causes the modem to enter test mode, but is equivalent to entering on-line state). Now try to view the modem’ s firmware identity code: • T ype: A TI9 <E> Y our command will be ignored. This is because the modem assumes you are t[...]

Page 18 Response Codes Y our modem is capable of telling you, with on screen messages, what it is doing. These messages are known response codes or result codes, and you will see them from time to time. For example: After a command is successfully executed, the response is: OK After a connection is established, the response is: CONNECT A complete l[...]

A T Commands Page 19 Dial Modifiers Dial modifiers are characters than can be included in a phone number to make the modem perform special tasks while dialling. For example, not all modem users will be using a dedicated telephone line. Some users will have their modems connected to P ABXs. T o allow users of P ABXs to operate their modems successfu[...]

Page 20 Hanging Up The H command is used to hang up the modem. After you have finished communicating with another computer you must hang up your modem. Similarly , you must hang up the phone after calling another person. If you don’t, no one will be able to call you and you may even be charged for the length of time the phone was off the hook. T [...]

A T Commands Page 21 Y our modem is pre-configured to automatically answer any incoming call, provided it is switched on, is in local command state, DTR is high and is not performing a test. If you receive a call on the phone line the modem is connected to, it will answer the call and attempt to connect to the calling modem. S Register 0 contains t[...]

Page 22 Selecting Speeds The following section describes how to select line and terminal speeds for your modem. T erminal Speeds Y our modem has the ability to communicate with your computer at various speeds. The modem offers two speed modes: variable speed mode and constant speed mode. Constant speed mode forces your modem to maintain the termina[...]

A T Commands Page 23 Setting T erminal Speeds Y our modem can sense the terminal speed of the computer and automatically change its terminal speed to match. This is known as ‘auto bauding’, and is done each time an A T command is issued to the modem. Y our modem can auto baud at 300 bps through 9600 bps, 14,400 bps, 19,200 bps, 38,400 bps, 57,6[...]

Page 24 Example 2 - Dialling other modems at 19,200 bps (V .34 or V .FC) B Command Setting: B18 T erminal Speed: 57,600 bps Flow Control: On (&K3 for R TS/CTS flow control) Y ou may use this arrangement when dialling online information services or bulletin boards. W ith these settings, you modem will attempt to connect at 19,200 bps, but may ch[...]

A T Commands Page 25 Example 3 - Answering incoming calls B Command Setting: B9 T erminal Speed: 38,400 bps Flow Control: On (&K3 for R TS/CTS flow control) If you wish your modem to answer incoming calls, use these settings. This will allow your modem to connect at any speed between 14,400 bps and 300 bps. If you are using a software program t[...]

Page 26 Flow Control Y our modem supports R TS/CTS, XON/XOFF and T ransparent XON/OFF flow control. Flow control ensures that data is not lost between your computer and your modem. Flow control will be ignored when your modem is configured for variable speed mode (A TN1) or is in local command state. RTS/CTS Flow Control R TS/CTS flow control take[...]

A T Commands Page 27 Transparent XON/XOFF flow control is selected by issuing the &K5 command. Failsafe Flow Control Failsafe flow control is designed specifically for UNIX computers running the UUCP file transfer protocol. This form of flow control only affects data being transmitted from the computer to the modem. When the modem’ s data buf[...]

Page 28 Configuring the Modem Y our modem allows you to tailor its operating parameters to suit your own particular requirements. The modem uses S Registers to alter the configuration profile. Each S Register contains a decimal value to represent a time delay , an ASCII character or the number of times the phone should ring before the modem answers[...]

A T Commands Page 29 Error Correction Error Correction Protocols This section examines the error correction and data compression features of your modem. The modem offers both V .42 (LAP-M) and MNP® (Microcom Networking Protocol™) error correction protocols. These protocols allow data errors to be detected by the receiving modem, provide flow con[...]

Page 30 Data Compression T wo forms of data compression are supported by your modem; V .42bis and MNP 5. V .42bis is based on the Lempel-Ziv compression technique (similar to the techniques used by PC compression programs) and can work with both V .42 and MNP . V .42bis is very good at compressing data that has repetitions of sequences of character[...]

A T Commands Page 31 variable speed mode. N3 selects V .42/MNP auto-reliable mode and N5 selects V .42-only autoreliable mode. Y our modem supports special CONNECT messages for connections made with either reliable or auto-reliable modes. When the A TV1 command is issued and your modem connects in either reliable or auto-reliable mode, a respons[...]

Page 32 when operating with poor line quality . If the telephone line drops out, MNP 10 will attempt to reconnect up to the maximum time permitted by your country’ s telecommunications rules. Thus, if there is a short line drop-out, MNP 10 will provide minimal interruption whereas other modems will disconnect entirely . MNP is the only type of er[...]

A T Commands Page 33 Increasing Data Throughput with Error Correction & Data Compression Data throughput refers to the amount of data being transferred. Error correction and data compression allow you to increase data throughput in comparison to if error correction and data compression were not selected. T o allow error correction and data comp[...]

Page 34 Security & Encryption Y our modem has many sophisticated security features. Y our modem limits caller access by means of user names and passwords. User names and passwords are stored in the modem’ s non- volatile memory . W ith each user name and password a modem command of up to 30 characters may be specified. This allows the impleme[...]

A T Commands Page 35 Adding and Changing Users Y our modem allows you to add new users and change existing users. Selecting option 2 on the Security Menu will result in a prompt: Enter Name: T o add a new user: • T ype in the name of the new user <E> User names must not be longer than 30 characters. They are NOT case sensitive. T o change a[...]

Page 36 If you do not enter a command you will be given the option of entering a SuperSecure DES Key for the user . T o use this feature refer to the ‘SuperSecure Advanced Security Mode’ or else press ENTER to go on to the next user . Removing Users Y our modem allows you to remove individual users or all the users currently stored in your mode[...]

A T Commands Page 37 attempt was made to connect with that user name. Y ou should regularly check the number of successful and unsuccessful attempts to connect to your modem. • Select option 4 to view the access record <E> An unusually high number of unsuccessful attempts to connect with a particular user name may indicate someone is trying[...]

Page 38 Callback Security As mentioned earlier, your modem allows you to specify a modem command with every user name and password. This feature allows you to implement modem callback. Callback means that after a caller has successfully connected, your modem will hang up and then dial the caller . Even if an unauthorised caller successfully connect[...]

A T Commands Page 39 Y our modem will issue an OK message. Y ou will be returned to local command state. Downloading the Security File Selecting option ‘D’ from the security menu will enable a dump of the security database to your computer for storage or editing. Y ou will be asked to type ‘Y’ to start the download. The file format is: “&[...]

Page 40 and always keep a copy of the unmodified download file. Integrating Caller ID into the Security Database • Enter the Security Menu by typing A T#S. Y ou will then be presented with a request for a Password. If you have not specified a password then key ENTER, else type in the password. The Caller ID status is displayed at the bottom of th[...]

A T Commands Page 41 Encryption Y our modem supports Data Encryption Standard (DES) encryption. DES encryption allows you to encrypt data being passed to a remote modem. The remote modem must support Cipher Feedback (or CFB) DES encryption in order to decrypt the data sent from your modem. The #E1 command is used to enable DES encryption. The modem[...]

Page 42 ☞ ☞ ☞ ☞ ☞ For countries other than Australia, DES encryption is only available to end users who meet the security requirements of the Australian Department of Defence. Contact your modem supplier for details of making application for a DES equipped modem to be supplied to you. DES Multikey DES Multikey allows the answering modem t[...]

A T Commands Page 43 Entering a Key for Each User • Enter A T#E2 to enable SuperSecure mode • Select the security menu using A T#S • Enter the security password to gain access to the security menu • Set up the modem’ s primary DES KEY and Initial V alue (IV) as per standard DES setup • Select Option 2 to add new users • Enter the user[...]

Page 44 Accessing a System Using SuperSecure If both your modem and the remote modem have been correctly setup you can: q Dial the remote system. ❑ The modems will connect and enter security dialog mode using the modem’ s primary key . ❑ This key must be the same for both modems. • Enter your username • Press ENTER • Enter your user pas[...]

A T Commands Page 45 • ‘Fudge’ is Mark Stein’ s password on the remote system • ‘V anilla’ is the password on the local modem • ‘Access granted’ confirms that the passwords are correct • Secondary keys mismatch if the secondary KEY , IV or KE are different Enabling Rotating Secondary Keys ❑ If you enter a KE of 00 for the us[...]

Page 46 Entering a Password in the Remote Modem’s Database When connected in SuperSecure, you may change your password. • Enter **** with a 1 second guard time on either side of the stars • Enter your current password • Enter your new password • V erify your new password • Y ou will then be returned online Entering a New Password in the[...]

A T Commands Page 47 ❑ The record format is: aaa, “<username>”, “<encrypted password>”, “<command>”, “bbb,ccc,ddd,eee,fff,ggg”, “<encrypted key>”, “<encrypted> IV”, “<encrypted KE>”CR,LF • aaa is 3 digit control number • bbb is 3 digit access granted count • ccc is 3 digit acce[...]

Page 48 Dial Stored Phone Numbers Only Option Option ‘M’ is similar to Option ‘K’ but restricts the modem to dialling only those numbers listed in the stored phone number fields as set with the &Z command. The stored numbers must then be dialed using the A TDS=X command where X is the position of the stored number as set with the A T&am[...]

A T Commands Page 49 Synchronous Modes This section explains the use of your modem in synchronous modes. A dumb mode or manual mode allows some of the functions of your modem to be accessed via the front panel switches. Some of the information in this section assumes you have read the Getting Started Section. Y our modem offers two synchronous mode[...]

Page 50 Synchronous Mode 1 Y our modem is capable of dialling remote systems in asynchronous mode and then automatically switching to synchronous mode once connection has been made. If the connection is lost, your modem will hang up and return to asynchronous local command state. The computer required to support synchronous communication with your [...]

A T Commands Page 51 ☞ ☞ ☞ ☞ ☞ Data should only be transmitted once DCD, DTR and CTS have been asserted. Your computer should not assume that if CTS is asserted then it is safe to begin transmitting data — your modem will keep CTS asserted whenever it is in local command state. Hanging Up Y our modem will hang up and return to asynchron[...]

Page 52 Dialling Dialling will commence as soon as the DTR signal is asserted (an OFF-ON transition occurs). Y our modem will not generate response codes when synchronous mode 2 is selected. All call progress is indicated by your modem’ s speaker (the M command controls the operation of your modem’ s speaker). As soon as your modem connects to [...]

A T Commands Page 53 Leased Line Operations A leased line, or private line, is a telephone line that permanently connects two or more locations. The leased line does not have any switching equipment associated with it. Leased-line operation with the modem is selected with the &L command. The &L command informs your modem that communications[...]

Page 54 ☞ ☞ ☞ ☞ ☞ Your modem will hang up and return to local command state if your computer transmits characters while the modem is attempting to establish or re-establish a connection (unless &N0 has been issued). Auto Leased Line Operation (&L2 or &L3) Y ou can select Auto leased line operation with the &L2 or &L3 c[...]

A T Commands Page 55 4 Wire Leased Line setup via audio port Y our Global Carrier 56 has been supplied with an audio port which enables you to setup 4 W ire Leased Line: 1. Connect Leased Line cable (Pins 1 and 4 for TX / 2 and 3 for RX) to the Audio ports on your Global Carrier . 2. Issue the following commands through HyperT erminal to activate t[...]

Page 56 Dumb Mode Operation Y our modem has two methods of operating with your computer . The commonly used method is “smart mode”, where the computer issues “A T” commands to the modem to make it dial and hang up For computers which do not offer an asynchronous port or cannot communicate synchronously using V .25bis commands, dumb mode per[...]

A T Commands Page 57 Refer to the mode table at the beginning of the User Guide - it shows the meaning of each combination of the Mode LEDs. T o change the speed at which your modem connects after answering an incoming call: • Place front panel Option switch 4 in the Up position (select Smart mode) • Connect your modem to a personal computer ?[...]

Page 58 • Place front panel Option switch 4 in the Down position (select Dumb mode) • Place front panel Option switch 6 in the Down position (select Originate mode) • Place front panel Option switch 3 in the Down position (disable autoanswering) ☞ ☞ ☞ ☞ ☞ Your modem cannot dial if auto-answer is enabled. • If necessary , use the M[...]

A T Commands Page 59 • T ype: A T&W <E> The modem set up is saved. • Place front panel Option switch 4 in the Down position (select Dumb mode) • Place front panel Option switch 6 in the Down position (select Originate mode) • Place front panel Option switch 3 in the Down position (disable autoanswering) ☞ ☞ ☞ ☞ ☞ Your mo[...]

Page 60 The connection speed of the modem is indicated by the Mode LEDs. Refer to the Modem LED Display table; it shows the meaning of each combination of Mode LEDs. • Press the T alk/Data button to Data (this button is located next to the front panel Option switches) • Raise the DTR signal on your computer DTR must change from “low” to “[...]

A T Commands Page 61 Manual Answering For reasons of data security , it may be desirable to verbally identify a caller before allowing connection to your computer . A telephone handset must be connected to the same telephone line as your modem to permit manual answering. • Place front panel Option switch 4 in the Up position (select Smart mode) ?[...]

Page 62 The Option Switches The Option switches allow you to control the operation of your modem in Dumb mode, as well as providing additional features in Smart mode. For users of modems with front panel Option switches only • Front panel Option switches 1 and 2 always take precedence over software setting of behaviour of DTR and DSR. When A T%F [...]

A T Commands Page 63 V .25bis Operations V .25bis is a modem command set like the A T command set, which allows you to control your modem. However , V .25bis commands may be issued to the modem in asynchronous or synchronous mode (A T commands may only be issued when the modem is operating in asynchronous mode). This means V .25bis is suitable for [...]

Page 64 Overridden Settings Almost all A T commands and S Registers stored before entering V .25bis mode will have effect except for the following commands. A T Command V .25bis Operation &D Will act as if &D2 is selected S 0 Will act as if S0=1 These override settings are not stored in your modem’ s non-volatile memory; they are active o[...]

A T Commands Page 65 V .25bis Indications V .25bis indications are similar to the response codes, sent when your modem is operating in A T command mode. Six V .25bis indications are supported by your modem: V erbal Meaning V AL Command accepted and executed CN X Connection established IN C Incoming call detected CFI AB Call failure, abort CFI ET Ca[...]

Page 66 Most P ABXs require you to dial 0 or 9 (in order to obtain an outside line) and wait for a dial tone before dialling the actual phone number . Using dial modifiers, you can successfully dial the phone number 12345 through a P ABX using the command: • T ype: CRN 0<12345 The < dial modifier causes the modem to pause for a short time a[...]

A T Commands Page 67 Direct Dialling Direct dialling refers to your modem’ s ability to dial a stored phone number when the DTR signal of your computer is raised. This form of dialling is particularly suited to synchronous computers and is referred in other parts of this guide as ‘DTR Dialling’. ☞ The &M command (used to select various [...]

Page 68 ☞ If you issue the DIC command but then want to answer the call, issue the CIC command. The CIC command will cause your modem to answer a call after the DIC command has been issued. The modem will then go on line, transmit an answer tone, and attempt to connect to the calling modem using the communications standard selected by the B comma[...]

A T Commands Page 69 Modem Cable In order to operate correctly , your modem cable must support the following signals: DB25 Pin Signal 2 Transmit Data (TxD) 3 Receive Data (RxD) 4 Request to Send (R TS) 5 Clear to Send (CTS) 6 Data Set Ready (DSR) 7 Signal Ground 8 Data Carrier Detect (DCD) 15 Transmit Clock (TxC)† 17 Receive Clock (RxC)† 20 Dat[...]

Page 70 HDLC Notes Commands must be correctly framed to be accepted by the modem. The address field must be FF , the control field must be 03 (hex) or 13 (hex) or a bad FCS field or an abort is received. If a succession of V .25bis indications are to be sent to your computer , the poll bit (or final bit) will be set to zero for all but the last V .[...]

A T Commands Page 71 Distinctive Ring The modem is able to discriminate between three different types of rings. This is useful if you purchase the T elstra Duet service. With T elstra Duet, two phone numbers are shared for one telephone line. One is for voice and the second is for your modem. T o enable the modem to answer only when your modem numb[...]

Page 72 Caller ID The Global Carrier 56 has enhanced Caller ID functions integrated with its security system. The user can set up the modem to display the number of all inbound calls and selectively answer or not answer the call depending on whether the caller is known. The modem can also be programmed to play a unique ‘tune’ if the caller is k[...]

A T Commands Page 73 REASON NO NAME = <message> where message is ‘Out Of Area’ or ‘Private’ is displayed if the network does not provide a name QUAL = Long Distance is displayed if the call is long distance REDIRECT = <message> where message can be ‘Call Forward’ or ‘Call Forward: First Number Busy’ or ‘Call Forward: F[...]

Page 74 Y ou will then be prompted for another name. When you are finished entering names. Key ENTER to return to the Security Menu. Y ou may display the users in the database by selecting the ‘1’ command. Caller ID entries are distinguished from DIAL BACK security entries by the lack of valid A T commands in the Command field. Distinctive Ring[...]

A T Commands Page 75 Call Logging The Global Carrier 56 now includes a Call Logging Function. This function will automatically record the Date, Time, Phone Number and Name of any inbound call that has Caller ID information. In addition the modem will also log all outbound calls that are originated by the modem and record the phone number, connect s[...]

Page 76 Commands +++ Escape Sequence When the modem is in on-line-state, issuing an escape sequence will force it to return it to on- line command state, without disconnecting. Unlike other commands, you should not type A T before the escape sequence, nor type a carriage return after it. Instead, wait a full second before you type the escape sequen[...]

A T Commands Page 77 **** Remote Access Sequence When the modem is connected to a remote modem and is in on-line state, the remote modem may type this command to force the modem to enter Remote Access mode. Remote Access mode simply means the remote modem will be able to issue A T commands to your modem, just as if you were typing them at your comp[...]

Page 78 Options **** Request remote access See Also #A command Universal Remote Access S Register 66 Remote Access Guard T ime S Register 67 Remote Access Character[...]

A T Commands Page 79 AT ? Interactive Command Help Y our modem will display information about the A T commands it supports if you type a question mark (?) in your A T command. Y ou can view the modem help as ‘pages’ of information. This allows you to read the information at your own pace. Press the Spacebar to view the next help page, Backspace[...]

Page 80 A/ Repeat Last Command T his command orders the modem to re-execute the last command you entered. Unlike other commands, the Repeat Last Command should not be preceded by an A T , nor followed by a carriage return. This command must be typed on one line by itself. Options A/ Repeat last command[...]

A T Commands Page 81 AT A Answer This command enables you to answer an incoming call manually . On receiving an incoming call, the modem will send a RING message code to your computer . When you see the ring message: • T ype: A T A <E> Y our modem will send an answer tone to the calling (originating) modem and wait to receive a carrier sign[...]

Page 82 AT Bn Select Communications S tandard Y our modem is capable of connecting to remote systems using a variety of communications standards. This command enables you to select the communications standards you want to use. The performance of V .90 and K56flex are very similar . The main dif ference is the connect speeds available for K56flex an[...]

A T Commands Page 83 B30 V .34 at 9600bps B31 V .34 at 12,000bps B40 V .90 at 28,000bps B41 V .90 at 29,333bps B42 V .90 at 30,667bps B43 V .90 at 32,000bps B44 V .90 at 33,333bps B45 V .90 at 34,667bps B46 V .90 at 36,000bps B47 V .90 at 37,333bps B48 V .90 at 38,667bps B49 V .90 at 40,000bps B50 V .90 at 41,333bps B51 V .90 at 42,667bps B52 V .90[...]

Page 84 B11 V .32 at 7200bps B12 V .32 (Non-TCM) at 9600bps B13 V .32 at 9600bps B14 V .32bis at 12000bps B15 V .32bis at 14400bps B16 V .34 at 14,400bps B17 V .34 at 16,800 bps B18 V .34 at 19,200 bps B19 V .34 at 21,600 bps B20 V .34 at 24,000 bps B21 V .34 at 26,400 bps B22 V .34 at 28,800 bps B23 31,200 bps B24 33,600 bps B25 (Reserved) B26 (Re[...]

A T Commands Page 85 See Also A Command Answer B Command Select Communication Standard D Command Dial +MS Command[...]

Page 86 AT D Dial This command allows you to dial a telephone number . The basic dialling command is: A TD followed by the telephone number . For example: T o dial the number (09) 1 1 1-1234 • T ype: A TD0911 11234 <E> Y ou can use hyphens, spaces or parentheses. They will be ignored by the modem, but they will make it easier to read the co[...]

A T Commands Page 87 Dial Modifiers Dial modifiers enable you to change the characteristics of dialling. (Definitions for all modifiers appear on the following pages.) Modifier Meaning , pause ; return to local command state R reverse mode @ wait for quiet answer J initiate MNP 10 at 1200 bps M initiate MNP 10 at 4800 bps K MNP 10 cellular option L[...]

Page 88 ; return to local command state This modifier orders the modem to return to local command state — without disconnecting — after it has dialed the number . Y ou may use this modifier to communicate with a mainframe computer using security callback. Y our modem dials the number of the mainframe computer and then immediately returns to loc[...]

A T Commands Page 89 For example: T o tone dial a remote database on 999-1234, wait for a five-second silence and then tone dial an ID code of 1234: • T ype: A TDT9991234@1234 <E> J initiate MNP 10 at 1200 bps This modifier allows you to select MNP 10 and make the initial connection at 1200 bps (V .22). MNP 10 is able to automatically adjus[...]

Page 90 ! hook flash The ! dial modifier issues a hook flash signal — the modem hangs up for a short period. Hook flashes are commonly used with P ABXs to transfer calls. For example: T o dial 0, hook flash and then dial 12345: • T ype: A TD0!12345 <E> ☞ ☞ ☞ ☞ ☞ UK Modems. Use of the hook flash is not allowed in the United Kingd[...]

A T Commands Page 91 If the modem received any characters from the computer while it is waiting for a dial tone, it will hang up, return to local command state and send a NO CARRIER message. For example: T o wait for a dial tone and then dial 11 1-0123: • T ype: A TDW1 110123 <E> See Also &Z Command Store Phone Number S Register 6 W ait[...]

Page 92 AT E Echo The E commands enables you to select whether the characters you type at your keyboard (while in the local command state) will be echoed back to the screen by the modem. Options A TE 0 Disable local command state echo A TE1 ■ Enable local command state echo Range 0-1[...]

A T Commands Page 93 AT H Hang Up The H command forces the modem to hang up. The H0 command (Hang up) is used to terminate a call. The H1 command (Go off- hook) can be used to make your modem appear as busy to a remote modem trying to dial in. When you issue the H1 command, the modem goes off-hook but will not generate carrier or answer tones. The [...]

Page 94 AT I Identity Y our modem contains a product identity code, also known as the firmware identity code.Y ou can use the I command to display these codes. Options A T I 0 Display numeric identity code A TI 1 Return a checksum of modem’ s firmware A T I 3 Display model identifier A T I 4 Display code revision and creation date A T I 5 Display[...]

A T Commands Page 95 AT L S peaker V olume Control Y our modem has a volume control which allows you to adjust the volume of its internal speaker . Y our modem is preset for comfortable listening levels in a normal office environment, so most users will not need to change the preset volume of their modem. There are four speaker volume levels: 0 Low[...]

Page 96 AT M Monitor Y our modem has a built-in speaker enabling you to monitor the progress of calls. Y ou can listen for dial tones, busy signals, a successful connection to another modem, or someone answering your call. The M command controls the operation of the speaker . ☞ ☞ ☞ ☞ ☞ Some modems also provide volume control via the L com[...]

A T Commands Page 97 AT O Return to On-line S tate The O command enables you to return to on-line state from command state. When you are on- line (connected to a remote computer), anything you type is treated as data by your modem. If you want to send commands to your modem, you must return to local command state by typing the escape sequence (+++)[...]

Page 98 A T O2 7 Change line speed to 14,400 bps (V .32bis/V .34) A T O2 8 Change line speed to 16,800 bps (V .32bis/V .34) A T O2 9 Change line speed to 19,200 bps (V .32bis/V .34) A T O3 0 Change line speed to 21,600 bps (V .32bis/V .34) A T O3 1 Change line speed to 24,000 bps (V .32bis/V .34) A T O3 2 Change line speed to 26,400 bps (V .32bis/V[...]

A T Commands Page 99 AT Q Quiet (Suppress Response Codes) Y our modem has a variety of messages or response codes which it sends in response to various commands. Examples of these codes are the OK and CONNECT messages. The Q command allows you to switch these messages on and off. If you switch the messages off, no response codes will be displayed o[...]

Page 100 AT R Set T erminal S peed The R command allows you to switch off “autobauding” and specify the terminal speed at which your modem operates. Normally your modem uses autobauding, meaning that when you issue commands to your modem, it automatically detects the speed at which you issue the commands and changes its terminal speed to match [...]

A T Commands Page 101 A TR26 26,400 bps (locked terminal speed - no autobaud) A TR28 28,800 bps (locked terminal speed - no autobaud) A TR38 38,400 bps (locked terminal speed - no autobaud) A TR57 57,600 bps (locked terminal speed - no autobaud) A TR76 76,800 bps (locked terminal speed - no autobaud) A TR96 96,000 bps (locked terminal speed - no au[...]

Page 102 AT Sn? Display S Register V alue The Sn? command allows you to read the value in a particular Special Register (S Register). The command is in the form: A TSn? where n is the number of the S Register you want to read. For example: The number of times the modem will allow the phone to ring before answering an incoming call is determined by [...]

A T Commands Page 103 AT Sn= Set S Register V alue The Sn= commands enables you to change the value in a Special Register (S Register). The format for the command is: A TSn=x where n is the number of the S Register whose value you wish to change and x is the value you wish to place in the register . For example: The character interrpreted as being [...]

Page 104 AT V V erbal Response Codes Y our modem can display either verbal or numeric response codes in response to various commands. The V command enables you to select which type of response code you want to display . Basic response codes common to all modems are: V erbal Numeric Meaning O K 0 Command accepted and executed CONNECT 1 Carrier detec[...]

A T Commands Page 105 AT W Connection S peed Information T he W command allows you to decide whether your modem will report its line speed or terminal speed when it connects to another modem. Options A T W 0 The CONNECT message reports the terminal speed A T W 1 The CONNECT message reports the terminal speed A TW2 ■ The CONNECT message reports th[...]

Page 106 AT X Extended Response Codes The X command enables you to choose which response codes will be displayed. The basic response codes for all modems are: V erbal Numeric Meaning O K 0 Command accepted and executed CONNECT 1 Carrier detected and connection established RING 2 Ringing signal detected NO CARRIER 3 Carrier lost or not detected ERRO[...]

A T Commands Page 107 0-6 See Also Q command Quiet (Suppress Response Codes) V command V erbal Response Codes W command Connection Speed Information V command Error Correction Response Codes %U command V .42 Response Codes S Register 95 Extended Response Codes[...]

Page 108 AT Zn Restore Configuration Profile Y our modem is supplied with a default operating set up. Y ou can change this temporarily by issuing commands while you are working, or permanently by using the &Wn command to store profiles you’ve made in non-volatile memory (where n=profile 0,1,2 or 3). The Zn command returns the modem to saved c[...]

A T Commands Page 109 AT &B Character Length The &B command allows the modem to use character lengths of 8, 9, 10 or 11 bits. ☞ ☞ ☞ ☞ ☞ The modem will only match the speed of your computer when 10-bit or 1 1-bit characters are selected. Range 0-4 Options A T&B0 8 bit characters A T&B1 9 bit characters A T&B2 10 bit cha[...]

Page 110 AT &C Controlling Data Carrier Detect The &C command enables you to control how DCD will operate. DCD is a RS-232 interface signal from the modem to a remote device, such as a terminal or a computer, indicating that the modem is receiving a carrier signal from a remote modem. This signal is switched on (asserted) when your modem is[...]

A T Commands Page 111 AT &D Controlling Data T erminal Ready The DTR signal is used to indicate to the modem whether your computer is ready to communicate. ☞ ☞ ☞ ☞ ☞ The &D command will only take effect when the DTR option switch is in the UP position and %S0 is selected. (See the Dumb Mode Section for details.) Options A T&D0[...]

Page 112 AT &F . Reinitialise Modem The &F . command will completely re-initialise your modem. This command will delete stored phone numbers, security , and encryption settings. W e recommend you execute this command immediately after installing your modem. All of the stored profiles in non-volatile memory will be restored to factory defaul[...]

A T Commands Page 113 AT &F Restore Factory Defaults Y our modem comes with factory default settings for all communications settings and S Registers. The &F command enables you to restore the factory default values to the command settings and S Registers. This command does not reset stored phone numbers, security , or encryption settings. T[...]

Page 114 AT &G Guard T one The &G command controls the generation of guard tones. A guard tone is a predetermined frequency generated by the modem to supervise the communications path. The &G command only affects V .22 and V .22bis connections. Options A T&G0 ■ Do not generate guard tones A T&G1 Generate guard tones of 550Hz A[...]

A T Commands Page 115 AT &H Clock Control The &H command determines when clocks will be applied to the ‘RxC’ RS- 232 signal. With &H0 selected, the RxC signal will be active whenever a synchronous mode is selected. With &H1 selected, the clock will only be present after a connection has been established to another modem. Options[...]

Page 116 AT &K Flow Control The &K command enables you to select the type of flow control used between your modem and the local computer when asynchronous mode is selected.Y ou may want to do this to prevent possible data loss resulting from buffer overflow . Using flow control guarantees that data buffers in your modem and computer won’t[...]

A T Commands Page 117 the modem to the computer . Range 0, 3-5, 9 See Also N command Operating Mode Q command Extended Flow Control S Register 80 Flow Control High W ater Mark S Register 81 Flow Control Low W ater Mark S Register 82 Failsafe Flow Control Overrun[...]

Page 118 AT &L Leased Line The &L command allows you to specify whether your modem will be connecting over the public switched telephone network (PSTN) or leased lines (point-to-point connection). When the leased-line mode is selected, if the carrier from the remote modem is lost, the modem will continuously attempt to re-establish a connec[...]

A T Commands Page 119 AT &M Synchronous/Asynchronous Mode The &M command enables you to select either asynchronous or synchronous operation. During asynchronous transmissions, the time between characters being sent may vary , and the characters are delimited by start and stop bits to co-ordinate data transfer . During synchronous transmissi[...]

Page 120 Range 0-2, 4 See Also &D command Controlling DTR &X command Synchrono us Clocks &Z command Stored Phone Number[...]

A T Commands Page 121 AT &N Abort Connection The &N command determines whether the modem will abort the attempt to make a connection if sent a character by the computer . Y ou can abort connection by either lowering the DTR (Data T erminal Ready) signal, or by sending a character (except a null or line feed character) to the modem. ☞ ☞ [...]

Page 122 AT &R RTS/CTS Control The &R command allows you to determine the relationship between the R TS (Request to Send) and CTS (Clear to Send) signals, when operating in synchronous mode. The &R command is ignored whenever asynchronous mode is selected. %R1 overrides the &R command. Options A T&R0 ■ CTS follows RTS when the[...]

A T Commands Page 123 AT &S Controlling DSR The &S command allows the modem to control the state of the DSR (Data Set Ready) signal. This command will only take effect when the DSR option switch is in the UP position (see your Dumb Mode Section for details). %S overrides the &S command. Options A T&S0 ■ DSR signal will always be a[...]

Page 124 AT &Vn View Active Configuration Profile The &V command allows you to view the active configuration profile of your modem. This shows the settings of A T commands and S Registers. Not all A T commands and S Registers will be shown. For example, the commands which relate to V .25bis operation will only appear when V .25bis mode is s[...]

A T Commands Page 125 AT &Wn Write Configuration Parameters The &Wn command allows you to save the current configuration profile including communications settings and S Register values into 1 of 4 stored profiles in the modem’ s non- volatile memory . The values contained in the modem’ s non-volatile memory specified by the &Y comma[...]

Page 126 AT &X T ransmit Clock The &X command nominates the source of its transmit clock signal when operating in synchronous mode. The receive clock is always derived from the receive (remote) carrier signal. Options A T&X0 ■ Synchronous clocks generated by Modem. The modem generates the transmit clock and applies it to pin 15 of the[...]

A T Commands Page 127 AT &Yn Select S tored Profile on Power Up The &Yn command determines which stored (User) profile is selected as the Active profile when the modem is switched on and also when &D3 is selected and DTR drops. Options A T&Y0 Select stored profile 0 on power up A T&Y1 Select stored profile 1 on power up A T&[...]

Page 128 AT &Z S tored Phone Number The &Z command enables you to store phone numbers in your modem’ s nonvolatile memory . The command takes the form &Zn=x, where x is the phone number you want to store and n indicates which of the stored phone numbers it will be saved as. Stored numbers may contain up to 20 characters, including dia[...]

A T Commands Page 129 AT #A Universal Remote Access This command allows a controlling modem to take control of a remote modem. All commands of the remote modem(s) are available to the controlling modem, with the exception of the T est commands. (DES keys can be changed and will take effect from the next connection made to the modem.) T o initiate r[...]

Page 130 Range 0-2[...]

A T Commands Page 131 AT #B 1200bps Originate Mode The #B command determines whether the modem will use V .23 or V .22 for its 1200 bps originate speed when B0 or B2 is selected. By default, your modem will use V .23 as its 1200 bps connection standard with B0 selected and V .22 with B2. #B1 reverses these settings. Options A T#B0 ■ B0 = V .23 B2[...]

Page 132 AT #C V .25 Calling T ones The #C command determines whether the modem will generate V .25 calling tones when operating in originate mode. V .25 calling tones are generated as a measure of courtesy if the telephone number you dial is answered by a person rather than a modem or other electronic device. It also allows an electronic device to[...]

A T Commands Page 133 AT #CID Caller ID The #CID command allows the user can set up the modem to display the number of all inbound calls and selectively answer or not answer the call depending on whether the caller is known. The modem can also be programmed to play a unique ‘tune’ if the caller is known. When enabled a message will be inserted [...]

Page 134 Options A T#CID0 ■ Caller ID disabled A T#CID1 Caller ID enabled A T#CID2 Caller ID enabled with response to host in hex format A T#CID3 Caller ID enabled with extended response See Also Refer to the section on Caller ID #S Command Security Menu Range 0-3[...]

A T Commands Page 135 AT #D V .25bis Direct Calling This command determines whether direct calling procedures (or ‘DTR dialling’) will be used when V .25bis mode is selected. Refer to the section titled ‘Direct Dialling’, which appears in the V .25bis chapter, for details of how direct dialling works. Options A T#D0 ■ Disable direct calli[...]

Page 136 AT #E Encryption The #E command allows you to select DES encryption operating mode. The #E1 command enables standard DES encryption. DES encryption allows you to encrypt data being passed to a remote modem. The remote modem must support Cipher Feedback (or CFB) DES encryption to decrypt the data sent from your modem. Y ou may compress the [...]

A T Commands Page 137 AT #H Display Help The #H or ? command may be followed by a command or keyword to display a description of a command. See Also ? Command Display Commands[...]

Page 138 AT #I V .22bis Leased Line The ITU specifies that in V .22 and V .22bis a different handshake should be used for leased line mode. This mode is specified by default. Some modems still use the standard PSTN handshake for leased line connections. Use #I1 to connect to these modems in V .22bis leased line mode. Options A T#I0 ■ V .22bis lea[...]

A T Commands Page 139 AT #J V .42 Capability Checking The #J command allows you to select whether your modem will check if the modem it is connecting to supports V .42, MNP or no error correction. This command only affects your modem when it dials another modem. If #J0 is selected, your modem will assume the answering modem is a V .42 modem. Y ou s[...]

Page 140 AT #K MNP 10 mode MNP 10 works in conjunction with error correction and data compression to improve the performance of your modem when operating with poor or varying quality telephone lines (as sometimes found with cellular or overseas telephone connections). MNP is the only type of error correction allowed with MNP 10 and is only availabl[...]

A T Commands Page 141 AT #M Command Mode Selection The #M command selects A T command mode or V .25bis operating mode. See the section — V .25bis Operations — for an explanation of V .25bis. The #M command doesn’t take effect until the an A T&W and an A TZ command are issued. Options A T#M0 ■ A T command operation A T#M1 Asynchronous V [...]

Page 142 AT #N V .25bis Character Encoding Use the #N command to select either NRZ or NRZI character encoding for V .25bis synchronous operation. This command only takes effect when a synchronous V .25bis operating mode is selected. Before setting the #N command, check which character encoding method is expected by your computer . Options A T#N0 ?[...]

A T Commands Page 143 AT #O Buffer Overflow The #O command decides what happens when your modem buffers fill and can no longer accept data. This will occur if data is received faster than your computer or modem can accept it. ☞ ☞ ☞ ☞ ☞ The #O command is not supported when a variable speed mode connection is established. Options A T#O0 ■[...]

Page 144 AT #Q V .25bis T erminal S peed This command allows you to specify the V .25bis terminal speed. When A T#Q0 is issued, your modem will use the speed at which you issued the last A T command for V .25bis mode. Alternatively , you may issue one of the other #Q commands to select a specific V .25bis terminal speed. Options #Q0 Use last autoba[...]

A T Commands Page 145 AT #R Enable Remote Control The #R command allows a remote modem to control your modem. Once a connection has been established, issuing the #R command will enable remote control mode. After the command is issued, any commands the remote modem sends to your modem will be acted upon by your modem, as if commands were being issue[...]

Page 146 AT #S Security Menu The #S command orders the modem to enter the Security Menu mode. When the modem is in Security Menu mode, the Security Menu will be displayed on your computer screen: SECURITY MENU Q = Quit 1 = List Users 2 = Add or Change Users 3 = Delete All Users 4 = View Access Record 5 = Reset Access Record 6 = Security Off 7 = Sec[...]

A T Commands Page 147 AT #U V .25bis Character Set The #U command is used to select the character set to be used when V .25bis mode is selected. ASCII characters are used by most computers; EBCDIC characters are used primarily by IBM mainframe computers. Options A T#U0 ■ ASCII character set A T#U1 EBCDIC character set Range 0-1[...]

Page 148 AT #V V erifier The #V command selects whether your modem will check the validity of the commands you issue to it. Y our modem can check both A T commands and values you write to the S Registers. When you use the #V0 command, no checking is performed on commands you issue. If you issue an unsupported command, the modem responds with an OK [...]

A T Commands Page 149 AT %B AutoAnswer Setting The %B command sets the number of rings before your modem answers. The default setting %B0 turns off AutoAnswer . Options A T%B0 ■ S0=0 No AutoAnswer A T%B2 S0=2 Modem answers after two rings[...]

Page 150 AT %C Compression Control Data compression is a technique used to reduce the size of data being transmitted without losing any of the original information. Compressed data must be decoded at the receiving end of the communications path in order to extract the original information. Full details on the subject of data compression can be foun[...]

A T Commands Page 151 AT %D Set Disconnect Delay The %D command enables you to set a delay between the time the modem is told to hang up and when it actually goes on hook. The modem will hang up whenever you issue an A TH command or the DTR (Data T erminal Ready) signal is lowered — after an &D2 or &D3 command is issued. A value of 0 or 2[...]

Page 152 AT %E Auto EQM Retrain The %E command allows an originating modem to automatically retrain its comunications equalisers during V .22bis MNP connections, or change the speed at twhich it is connected to another modem. S Register 33 and S Register 45 contain EQM (Eye Quality Monitor) threshold values. When the quality of the connection deter[...]

A T Commands Page 153 AT %F DTR/DSR override Front panel Option switches 1 and 2 may be used to control the DTR and DSR signals, or select V .25bis operation. Refer to the Dumb Mode section for details Options A T%F0 A & B switches control V .25bis function A T%F1 ■ Switch A forces DTR on, Switch B forces DSR high Range 0-1[...]

Page 154 AT %H MNP 10 Negotiation S peed This command allows you to determine the speed at which your modem will begin MNP 10 connections. MNP 10 can change the speed of the connection depending upon the quality of the line. This command sets the initial connection speed only . By initiating MNP 10 at a lower speed you can ensure that an error corr[...]

A T Commands Page 155 AT %K CTS During Dial and Handshake This command may be used with computers that expect the CTS signal to be raised when your modem is connected to a remote modem and is ready to send data. This command will interfere with the Abort Connection command (&N) if your computer cannot send characters to the modem when CTS is lo[...]

Page 156 AT %L Display Line Signal Level The %L command allows you to display the received signal level. The value returned is a 3-digit number, for example: 009 = -9 dBm 043 = -43 dBm A T%L Display received signal level Examples • T ype: A T%L <E> The line signal level is displayed.[...]

A T Commands Page 157 AT %Ln T ransmit Level (Data Mode) This command allows you to alter the transmit level of your modem. The command is in the form: A T%Ln where n is the level you wish to select. For example: T o set the transmit level to -15dBm: • T ype: A T%L15 <E> W ARNING Do not change the transmit level of your modem unless you hav[...]

Page 158 AT %M Mode LED Indication If your modem has three ‘Mode’ LEDs, you can use the %M command to determine whether the LEDs will indicate the line speed or the quality of the line. The Mode LEDs provide an indication of the line speed or line quality when you are connected to another modem only . If you have issued the %M0 command, refer t[...]

A T Commands Page 159 AT %N Non-S tandard T erminal S peeds Options A T%N0 ■ Standard Baud Rates A T%N1 Standard to 14400 then 20800, 31200, 41600 and 62400 A T%N2 Standard to 38400 then 51200[...]

Page 160 AT %P CONNECT Message T iming This command allows you to determine whether the CONNECT message will be sent before or after the DCD signal is asserted by your modem. Some Unix computers require the CONNECT message to appear after DCD is asserted. In this case, the A T%P1 command should be used. Options A T%P0 ■ CONNECT message appears be[...]

A T Commands Page 161 AT %Q Line Signal Quality The %Q command allows you to display the line signal quality . This command is not applicable to V .21, V .23 or Bell 103 connections. A lower value indicates a good quality connection.V alues above 40 indicate a bad quality line signal and that you should shift to a lower speed or use MNP10. V alues [...]

Page 162 AT %R CTS Override The %R command allows you to determine the state of the CTS signal. This command is intended to replace the CTS switch if your modem does not have one (eg Pocket & Rack Modems) This command overrides any &R setting. ☞ ☞ ☞ ☞ ☞ The %R command does not revert to the default setting after an A TZ, A T&F[...]

A T Commands Page 163 AT %S DSR Override The %S command allows you to determine the state of the DSR signal. This command is intended to replace the DSR switch if your modem does not have one (eg. Pocket & Rack Modems). If your modem has a DSR option switch, the switch setting will take preference to %S. %S1 overrides any &S setting. ☞ ?[...]

Page 164 AT %T DCD Override The %T command allows you to determine the state of the DCD signal. This command is intended to replace the DCD switch if your modem does not have one (eg. Pocket & Rack Modems). If your modem has a DCD option switch, the switch setting will take preference to %T . %T1 overrides any setting of &C ☞ ☞ ☞ ☞ [...]

A T Commands Page 165 AT %U V .42 Response Codes The %U command allows you to change the response codes issued by your modem when a V .42 connection is established. Compression & encryption messages will be added if active. After the %U1 command is issued, if your modem establishes a connection with V .42 error correction, a CONNECT/LAP-M messa[...]

Page 166 AT %W Welcome Message The %W command allows the answering modem to send a user specified message to the originating modem immediately after connection. This facility can be used to identify a company name, a particular service provided by this modem or simply to identify the modem itself. The message to be sent to the remote modem is speci[...]

A T Commands Page 167 AT A MNP Block Size The A command allows you to select the maximum block size to be used by your modem over an MNP error-corrected connection. Options A TA0 6 4 character block size A TA1 128 character block size A TA2 192 character block size A TA3 ■ 256 character block size Range 0-3[...]

Page 168 AT Bn Generate Break The Bn command is used to send a break sequence to the remote modem of length n*100mS. The length of the break sequence may be set from 0.1 seconds to 0.9 seconds. The default length of breaks generated by the modem is 0.3 seconds. The K command determines how the modem will react when a break sequence is received. [...]

A T Commands Page 169 AT J Auto-Reliable Fallback This command allows you to select whether your modem (when operating in auto-reliable mode) will use Constant Speed mode or V ariable Speed mode. If, with J0 selected, an error corrected auto-reliable connection cannot be established with another modem, the modem will fall back to Constant Speed m[...]

Page 170 AT K Break Control The K command determines how the modem will react when a break sequence is sent from your computer or received from the remote modem. During error corrected connections the modem sending the break determines how the receiving modem will react. During non-error corrected connections, the receiving modem determines how i[...]

A T Commands Page 171 ☞ ☞ ☞ ☞ ☞ If a break sequence is received by the modem while it is in local command state (and is maintaining a constant speed connection), the modem will not process the break until it returns to on-line state. If the break sequence is received by the modem while it is in local command state and maintaining a variab[...]

Page 172 AT N Asynchronous Operating Mode The N command allows you to select any of your modem’ s four asynchronous operating modes. A TN0 selects constant speed mode, enabling the modem to use different terminal and line speeds. Y our modem supports constant terminal speeds from 300 bps to 460,400 bps. For example, with constant speed selecte[...]

A T Commands Page 173 See Also B command Communications Standard &K command Flow Control J command MNP Fallback #J command V .42 Detect Phase Range 0-7[...]

Page 174 AT Q Extended Flow Control The Q command enables you to select flow control (handshaking) between your modem and computer . While performing the same function as the &K command, the Q command provides compatibility with Microcom modems. Flow control is only available when the modem is configured for constant speed mode or reliable o[...]

A T Commands Page 175 AT S Display Active Configuration The S command allows you to display the current active configuration. The following is a sample of the S command output: Options A T S Display Active Configuration[...]

Page ii AT Tn Inactivity T imer (Data Mode) The Tn command specifies the number of minutes the modem will stay on line when no activity is occurring. The timer may be set from 1 to 42 minutes of inactivity . Selecting 0 minutes will disable the timer . When the inactivity timer expires, the modem will hang up and return a NO CARRIER message with [...]

Page iii AT V Error Correction Response Codes The V command allows you to select the error correction response codes when an error corrected connection is established. With error correction response codes enabled, the messages are returned when a connection is established using error correction. If the A TX0 command has been issued, only the CONN[...]

Page 178 AT X XON/XOFF Pass Through The X command enables you to define whether XON and XOFF (software handshake) characters are allowed to pass through the modem to the remote system. The X command only affects XON/XOFF characters sent from your computer to your modem. It does not affect XON/XOFF characters sent from a remote system to your mod[...]

A T Commands Page 179 AT *K Select Primary DES KEY from S tored Keys The *K command allows the user to select the DES key from the 10 available stored keys. Default 0 Range 0-9 See Also # S Security # E Encryption ☞ ☞ ☞ ☞ ☞ The Security & Encryption section contains information on the application of the *K command.[...]

Page 180 AT *R V .13 Remote RTS Signalling The *R command allows your modem to simulate carrier control on a Synchronous Link by transmitting the local state of R TS to the remote modem. Some systems rely on R TS as an indicator of T erminal Ready to Send. When modems are inserted between the host and the terminal the status of R TS is not known si[...]

A T Commands Page 181 AT *S Change Current User Password The *S command allows the user to change their own password. If the user is connected the modem will ask for the current password before prompting for a new password. The user will then be asked to repeat the new password for verification. If the user is not connected the name of the user who[...]

Page 182 A T*T Auto Call Redial The *T command allows you to select whether the modem will redial the last number dialed automatically . If enabled the modem will dial the last number after 10 seconds. Options A T*T0 ■ Disable auto call redial A T*T1 Enable auto call redial Range 0-1[...]

A T Commands Page 183 AT *V Maximum V .42bis Dictionary Size The V .42bis dictionary size is normally negotiated during the V .42 handshake. The T elenetics Global Carriers have enough memory to store 8,192 dictionary entries. This will allow 8:1 compression on some file types. Some modems do not correctly negotiate the dictionary size, in these ca[...]

Page 184 AT *W Welcome Message T ext The *W command allows the user to specify the message that will be sent to the originating modem immediately after CONNECT if the %W1 W elcome Message is enabled. The message may contain any text limited only by the maximum command line size (80). The message may include new lines which are indicated by using th[...]

A T Commands Page 185 AT *Y Escape Seq. Detection in Sync. Escape Sequence Detection (i.e. +++) is normally disabled in all synchronous modes. This is because synchronous data cannot generate silences around the +++. However to diagnose line performance you need to be able to escape to command mode. T o allow these diagnostics to take place the use[...]

Page 186 A T+ICF Character Framing and Parity Select The +ICF command is used in conjunction with the R command to select the character format and parity of the RS232 interface when not in autobauding mode or if autobauding to 230kbps. The syntax is: A T+ICF=<format>[,<parity>] Format can be: 0 ■ auto 1 8 data bits no parity 2 stop bi[...]

A T Commands Page 187 A T+MS Select Modulation The +MS command selects the modulation, optionally enables or disables automode, and optionally specifies the lowest and highest connection rates using one to six subparameters. The command format is: +MS= <mod> [,[<automode>][,[<min_rate>][,[<max_rate>][,[<x_law>][,[<r[...]

Page 188 41333, 40000, 38667, 37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000 5 6 K 56flex 56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000, 40000, 38000, 36000, 34000, 32000 64 Bell 103 300 69 Bell 212 1200 The modem may also automatically switch to another modulation (automode), subject to the following constraints: • The modem may[...]

A T Commands Page 189 V .8 is not supported by the remote modem. • When V .90 is enabled the speeds listed can be used to set the maximum speed. For example: A T+MS=12,1,300,38667 This sets the maximum V .90 speed to 38667. Only the maximum speed is applicable when using V .90. The minimum speed cannot be set. • If <max_rate> is greater t[...]

Page 190 <rb_signaling> is an optional number which enable or disables robbed bit signaling generation in a server modem or enables or disables robbed bit signaling detection in a client modem. The option are: 0 = Robbed bit signaling generation (server modem) or detection (client modem) disabled (default) 1 = Robbed bit signaling generation [...]

A T Commands Page 191 A T+MS=? Reporting Supports Options The modem can send a string of information to the DTE consisting of supported options: Options +MS=? Example +MS: (0, 1, 2, 3, 8, 9, 10, 11, 12, 56, 64, 69, 74), (0,1) (300-56000), (300-56000) See Also +MS? Reporting selected options + M S Select modulation Range +MS: (list of supported <[...]

Page 192 AT -Q MNP10 Fallback to V .22bis The -Q command permits the modem to fallback from a V .34, V .32bis or V .32 connection with MNP10, to a V .22bis or V .22 MNP10 connection. MNP10 has the ability to make decisions regarding line quality and will request a change in speeds if it decides the phone line is not sufficient quality to maintain t[...]

A T Commands Page 193 AT -DA TE T ime & Date The -DA TE command allows the modem to record the T ime and Date in the log information inbound and outbound calls. The Time and Date will be set by an inbound call with Caller ID information or by issuing the A T -DA TE command. The Call Logging Function (A T -LOG) automatically records the Date, T [...]

Page 194 AT -LOG Call Log The A T -LOG command will automatically record the Date, Time, Phone Number and Name of any inbound call that has Caller ID information. In addition the modem will also log all outbound calls that are originated by the modem and record the phone number, connect speed, disconnect reason and call duration. The modem will als[...]

A T Commands Page 195 AT :E V .32 compromise Equaliser This command switches on or off the V .32 compromise equaliser . When operating over cellular connections, it may be desirable to switch off the V .32 compromise equaliser . For dial-up lines, the equaliser should be switched on. Options A T :E0 Disable the V .32 compromise equaliser A T :E1 ?[...]

Page 196 V .25BIS - CIC Connect Incoming Call The CIC command may be issued if you decide to accept an incoming call after issuing the DIC command. For details, refer to the ‘V .25bis Operations’ section of this guide. Options CIC Accept an incoming call after the DIC command has been issued See Also DIC command Disregard Incoming Call S Regist[...]

A T Commands Page 197 V .25BIS - CRN Dial This command allows you to dial a telephone number . The basic dialling command is: CRN followed by the telephone number . For example: T o dial the number (09) 11 1-1234 • T ype: CRN0911 11234 <E> Y ou can use hyphens, spaces or parentheses. They will be ignored by the modem, but they will make it [...]

Page 198 & hook flash The & dial modifier issues a hook flash signal — the modem hangs up for a short period. Hook flashes are commonly used with P ABXs to transfer calls. For example: T o dial 0, hook flash and then dial 12345: • T ype: CRN0&12345 <E> : wait for dial tone The : modifier causes the modem to wait for a dial ton[...]

A T Commands Page 199 V .25BIS - CRS Dial S tored Number Y our modem allows you to store phone numbers in non-volatile memory . The basic form of the CRS command is: CRS n where n is the stored phone number you wish to dial. For example: T o dial stored phone number one: • T ype: CRS 1 <E> ☞ ☞ ☞ ☞ ☞ Refer to your Modem Commands fo[...]

Page 200 V .25BIS - DIC Disregard Incoming Call The DIC command is used to disregard incoming calls. When your modem receives an incoming call, an INC message is sent to your computer . Y ou then have the number of seconds defined by S Register 71 to disregard the call. If you issue the DIC command, the call will be ignored, otherwise the modem wil[...]

A T Commands Page 201 V .25BIS - PRN S tored Phone Number The PRN command allows you to store phone numbers in your modem’ s nonvolatile memory . The command takes the form: PRNn;x where x is the phone number you want to store and n indicates which of the stored phone numbers it will be saved as. Stored phone numbers may contain up to 20 characte[...]

Page 202 V .25BIS - RST Reset Y our modem is supplied with a default operating set up. Y ou can change this temporarily by issuing commands while you are working, or permanently by using the &W command to store changes you’ve made in non-volatile memory . The RST command returns the modem to the last saved configuration and causes it to perfo[...]

S Registers Page 203 S Registers Introduction Y our modem contains a number of registers — memory stores — which define the modem’ s operating characteristics. These registers are called Special Registers or S Registers. This section of the Global Carrier 56 User Guide shows you the function and usage of each S Register, how to check the curr[...]

Page 204 2 ROM chips that have their data placed into them at the factory . They retain their information when the power is switched off. Y ou cannot make changes to information stored in ROM chips. Information such as factory default settings for S Registers is stored in your modem’ s ROM chips. 3 Non-volatile memory retains data without requiri[...]

S Registers Page 205 AT S 0 Rings Before Answer S Register 0 contains a decimal value (from 0-255) indicating the number of rings the modem will wait before answering an incoming call. If you place a value of 0 in this S Register, auto-answer operation will be disabled. The default value for S Register 0 is 0 — the modem will not answer an incomi[...]

Page 206 AT S 1 Ring Count S Register 1 contains a decimal value (from 0 to 255) indicating the number of rings detected. S Register 1 is incremented each time a ring is detected. It will be cleared if no ring occurs within 8 seconds of the last ring. Default 0 Range 0-255[...]

S Registers Page 207 AT S 2 Escape Sequence Character S Register 2 contains the ASCII value of the characters which form the escape sequence. The default value for this register is 43. The modem will recognise three + characters (+++) as the escape sequence. Setting this register to a value greater than 127 disables the modem’ s recognition of th[...]

Page 208 AT S 3 Carriage Return Character S Register 3 contains the ASCII value of the character recognised by the modem as the Carriage Return character in local command state. Default 13 Example A TS3=127 Recognise the DEL character as the carriage return Range 0-127[...]

S Registers Page 209 AT S 4 Line Feed Character S Register 4 contains the ASCII value of the character recognised by the modem as the Line Feed character in local command state. Default 10 Example A TS4=13 Recognise the Carriage Return character as the line feed Range 0-127[...]

Page 210 AT S 5 Backspace Character S Register 5 contains the ASCII value of the character recognised by the modem as the Backspace character in local command state. The preferred values for this register are ASCII codes 0 to 32 or 127. Default 8 Example A TS5=127 Recognise the DEL character as the backspace. Range 0-127[...]

S Registers Page 211 AT S 6 Dial T one W ait T ime S Register 6 determines how long the modem will wait for a dial tone after going off-hook and before dialling. This register contains a value indicating the number of seconds the modem will wait for a dial tone. This provides slow telephone exchanges the opportunity to apply a dial tone to the line[...]

Page 212 AT S 7 Wait for Carrier S Register 7 contains a value, in seconds, equivalent to the length of time the modem will wait for answer tone after dialling. If an answer tone is not detected within the time specified in this register , the modem will hang up and return a NO CARRIER message. After an answer tone is detected the modem has another[...]

S Registers Page 213 AT S 8 Pause Dial Modifier Delay S Register 8 contains the time in seconds the modem will wait when it encounters a comma (the pause dial modifier) in a dialling sequence. ☞ ☞ ☞ ☞ ☞ UK Modems. Changing S Register 8 from its default value may invalidate the approval of your modem. Examples A TS8=6 W ait six seconds whe[...]

Page 214 AT S 9 Carrier Detect Response T ime S Register 9 contains the length of time, in tenths of a second, the modem will wait before asserting the DCD (Data Carrier Detect) signal, after a carrier has been detected. The longer the time taken before asserting DCD, the less chance of line noise being mistaken by the modem as a carrier signal. If[...]

S Registers Page 215 AT S 10 Lost Carrier/Hang Up Delay S Register 10 contains the amount of time, in tenths of a second, the modem will wait after the carrier has been lost before hanging up. If a value of 255 is placed in this register, the modem will not hang up after the carrier is lost from the remote modem. In this case, you must use the H co[...]

Page 216 AT S 1 1 DTMF T one T iming S Register 11 contains the time, in thousandths of a second, of the duration and spacing of tones when tone dialling (DTMF tones). Examples A TS1 1=120 Space tones at 0.120 second intervals Default 95 Range 70-254[...]

S Registers Page 217 AT S 12 Escape Sequence Guard T ime The Escape Sequence Guard Time is the time delay required immediately before and after entering an escape sequence. For your modem to distinguish the escape sequence from ordinary data, there must be a period of silence both before and after the escape sequence is entered. If the Escape Seque[...]

Page 218 AT S 16 T est in Progress (read only) S Register 16 contains the number of the &T test command in progress. If no test is in progress S16 is 0. Examples A TS16 Default 0 See Also &T Self T est S Register 18 T est Timer Range 0-8[...]

S Registers Page 219 AT S 18 T est T imer S Register 18 contains the length of time, in seconds, that the modem will perform tests initiated with any of the &T commands. Y ou can terminate any test by issuing an A T&T0 command, or by allowing the time in the T est Timer to expire. Placing a value of 0 in S Register 18 disables the T est T i[...]

Page 220 AT S 25 DTR Loss Detection S Register 25 determines the time, in hundredths of a second, the DTR (Data T erminal Ready) signal must remain low before the modem will recognise a loss of DTR. Examples A TS25=8 DTR must remain low for 0.08 seconds before the modem will recognise loss of DTR Default 5 See Also &D DTR mode Range 0-255[...]

S Registers Page 221 AT S 26 RTS/CTS Delay If the R TS (Request T o Send) signal is asserted when operating in synchronous mode, the modem will wait for the period defined by S Register 26 before asserting the CTS (Clear T o Send) signal, when &R0 is selected. V alues in this register are in tenths of a second. Examples A TS26=15 W ait 1.5 seco[...]

Page 222 AT S 27 Delay Before Dial S Register 27 is used to define a delay of between 0 and 255 seconds which occurs after the D command is issued and before dialling commences. This should only be used when you intend to implement callback security . Providing a delay between the dialling command and actual dialling allows the calling modem suffic[...]

S Registers Page 223 AT S 29 Hook Flash Duration This S Register allows you to set the duration of the hook flash performed by your modem when the ! dial modifier is executed. Some P ABXs may require a different hook flash length to the standard 0.5 seconds. The value held in S Register 29 is in hundredths of a second. Examples A TS29=30 Set the ho[...]

Page 224 AT S 30 Inactivity T imer Data Mode This S Register allows you to set the duration of the hook flash performed by your modem when the ! dial modifier is executed. Some P ABXs may require a different hook flash length to the standard 0.5 seconds. The value held in S Register 29 is in hundredths of a second. Examples A TS30=60 Hang up after [...]

S Registers Page 225 See Also A TS105V oice ‘Dead-man’ T imer Range 0-255[...]

Page 226 AT S 33 EQM Threshold V alue S Register 33 is used to define the rate of change in the EQM (Eye Quality Monitor) value the modem will tolerate before initiating an equaliser retrain sequence. This S Register applies to V .32, V .32bis, V .FC & V .34 only . By setting this register with a low value, the modem will demand a high quality [...]

S Registers Page 227 AT S 38 Disconnect Delay S Register 38 determines the number of seconds the modem will wait before hanging up after the A TH command is issued or the DTR signal is lowered — after the &D2 command has been issued. If a disconnect delay has been defined, the modem will attempt to empty the contents of its data buffers befor[...]

Page 228 AT S 42 Modem Disconnect Reason S Register 42 contains a value indicating the reason the modem last disconnected. This allows you to check for possible faults if your modem suddenly hangs up or returns to local command state without you entering an escape sequence. The modem will return one of the following values in S Register 42: V alue [...]

S Registers Page 229 AT S 43 Break Sequence Length The value in S Register 43 defines the length of a break (long space) sequence generated by the modem to your computer when constant speed, reliable or auto-reliable modes are selected. The B command determines the length of breaks to the remote modem. Each unit is equivalent to 0.02 second. ☞ ?[...]

Page 230 AT S 45 V .22bis EQM Threshold V alue S Register 45 is used to define the EQM (Eye Quality Monitor) value the modem will tolerate before initiating an equaliser retrain sequence. This S Register applies to V .22bis only . By setting this register with a low value, the modem will demand a high quality connection. Setting a high value will a[...]

S Registers Page 231 AT S 57 DTR High Detection S Register 57 determines the amount of time, in hundredths of a second, that the DTR (Data T erminal Ready) signal must be high before the modem will recognise DTR being asserted. Example A TS57=8 DTR must be high for 0.08 seconds before the modem will recognise DTR being asserted Default 0 See Also &[...]

Page 232 AT S 62 V .42 Detection T imer S Register 62 allows you to set the V .42 detection timer . This specifies how long (in units of 0.01 seconds) the modem will send a V .42 detection pattern and wait for a V .42 detection pattern from the other modem. The originating modem sends the pattern then waits for a reply , the answering modem waits f[...]

S Registers Page 233 AT S 66 Remote Access Guard T ime The Remote Access Guard T ime is the time delay required immediately before and after entering a remote access sequence. If the Remote Access Guard T ime is one second and the remote access character has been defined as * (asterisk), you must maintain silence on the line for one second, then ty[...]

Page 234 AT S 67 Remote Access Character S Register 67 contains the ASCII value of the characters which form the remote access sequence. The default value of this register is 42 (asterisk character). The modem will recognise four * characters (****) as the remote access sequence. Examples A TS67=36 Recognise four $ ($$$$) characters as the remote a[...]

S Registers Page 235 AT S 69 Command Line T ime-out S Register 69 determines how long you have to type a command, after typing an ‘A T’, expressed as seconds. If the modem times-out before you complete a command, an ERROR message will be sent by the modem. The default value of 60 allows you 60 seconds between the time you have typed ‘A T’ a[...]

Page 236 AT S 71 Ignore Incoming Call This S Register is only applicable when your modem is operating in V .25bis mode. After an incoming call is detected, your modem will wait the number of seconds defined by S Register 71, allowing you to issue the DIC command if you do not wish to accept the call. For more details, refer to the section titled ?[...]

S Registers Page 237 AT S 74 Disconnect Reason for Prev . Call S Register 74 contains a value indicating the reason the modem returned to local command state, for the call before last. Thus, the value in S Register 42 will be copied to S Register 74 prior to a new disconnect reason being placed in S Register 42. This register is mainly used to allo[...]

Page 238 AT S 80 Flow Control High W ater Mark This S Register controls when your modem uses flow control to stop data from your computer . Data to be sent by your modem is stored in a ‘buffer’ (a temporary storage area) until it can be sent by your modem. If the buffer begins to fill, your modem will use flow control to stop your computer send[...]

S Registers Page 239 AT S 81 Flow Control Low W ater Mark This S Register controls when your modem uses flow control to resume the transmission of data from your computer . Refer to S Register 80 for a description of flow control water marks. ☞ ☞ ☞ ☞ ☞ Do not change the value of this S Register unless you are an experienced communications[...]

Page 240 AT S 82 Failsafe Flow Control Overrun This S Register works in conjunction with the A T&K9 command. If you are in &K9 mode and the modem needs to assert flow control it first drops CTS. If the host is using CTS flow control it should stop sending further characters. If the host is using XOFF flow control it will ignore the CTS sign[...]

S Registers Page 241 AT S 95 Extended Response Codes S Register 95 allows your modem to display extended response codes (or result codes). Because this S Register is a ‘bit-mapped’ register, values must be changed by storing the decimal number equivalent of the binary value represented bt the total of the bits. Examples A TS95=46 Displays the C[...]

Page 242 AT S 96 Help Page Width This S Register allows you to set the width of each Help page and the Configuration Profile (&V). Y ou may change the width of each page to suit your computer . Examples A TS96=40 Set the Help page width to 40 characters Default 80 See Also S Register 97 Help Page Length &V command V iew Active Configuration[...]

S Registers Page 243 AT S 97 Help Page Length This S Register allows you to set the length of each Help page and the Configuration Profile (&V). Y ou may change the length of each page to suit your computer . Examples A TS97=10 Set the Help page length to 10 lines Default 24 See Also S Register 96 Help Page Width &V command V iew Active Con[...]

Page 244 AT S 105 V oice ‘Dead Man’ T imer This S Register sets how long the modem remains in voice mode, when onhook and in non- autobauding mode, and when no characters are received from the computer . If the ‘Dead Man’ timer expires, the modem returns to data mode. This register may also be accessed by writing to S30 when in voice mode. [...]

S Registers Page 245 AT S 122 AutoRateChange The maximum average EQM level reached before the modem will downshift a speed. The default is 55 which means that if the average EQM ever goes higher than 55, then a downshift in speed will occur . ☞ ☞ ☞ ☞ ☞ EQM stands for Eye Quality Monitor , and is a reading of the current line quality. T o [...]

Page 246 AT S 123 AutoRateChange This S Register sets the average EQM limit that the modem must do better than, to achieve an upshift. The default is 16 which means that for an upshift to be possible the average EQM must be 16 or lower (for S124 + 12 seconds). Default 16 Range 0-20[...]

S Registers Page 247 AT S 124 Duration EQM This S Register sets the number of seconds after 12 that the modem must maintain the average EQM below the S123 value. The default is 30 which means that for an upshift to be possible with a setting of S123=16, the modem must maintain an average EQM of below 16 for a minimum of 42 seconds. Default 30 Range[...]

Page 248 Modem Response Codes Numeric V erbal Meaning 0 OK Command executed 1 CONNECT Connection established 2 RING Ringing signal detected 3 NO CARRIER Carrier lost or not detected 4 ERROR Command error, command longer than 80characters or timeout 5 CONNECT 1200 Connection at 1200 or 1200/75 bps 6 NO DIAL TONE Dial tone not detected on line 7 BUSY[...]

Modem Response Codes Page 249 1 6 7 CONNECT 36000/REL Error corrected connection at 36,000 bps 1 6 8 CONNECT 38000/REL Error corrected connection at 38,000 bps 1 6 9 CONNECT 40000/REL Error corrected connection at 40,000 bps 1 7 0 CONNECT 42000/REL Error corrected connection at 42,000 bps 1 7 1 CONNECT 44000/REL Error corrected connection at 44,000[...]

Page 250 RS-232 Signals This section describes each of the signals supported on the modem’ s RS-232 socket. ☞ ☞ ☞ ☞ ☞ Pin assignments are only applicable to products with a 25-pin DB-25 connector . Refer to your Product Guide for information regarding the pin assignments for your product. Transmit Data (TxD) - Pin 2 The computer transmi[...]

RS-232 Signals Page 251 Data Carrier Detect (DCD) - Pin 8 This signal indicates the presence of a compatible carrier signal. In asynchronous mode, the modem may be configured to assert DCD at all times, ignoring the presence of an incoming carrier signal. The &C command allows control over the state of the DCD signal. Transmit Clock (TxC) - Pin[...]

Page 252 Standard RS-232 Examples[...]

Abbreviated Command List Page 253 Abbreviated Command List General Commands +++ Escape Sequence ++ + Return to local command state **** Remote Access Sequence ? Interactive Command Help A/ Repeat last command A Answer an incoming call B n Select Communications Standard B0 ■ Auto-Connect B1 Auto-Connect B2 Auto-Connect B3 V .21 at 300bps B 4 Bell [...]

Page 254 B3 3 K56flex at 38,000bps B3 4 K56flex at 40,000bps B3 5 K56flex at 42,000bps B3 6 K56flex at 44,000bps B3 7 K56flex at 46,000bps B 40 V .90 at 28,000bps (K56flex at 32,000bps) B 41 V .90 at 29,333bps (K56flex at 34,000bps) B 42 V .90 at 30,667bps (K56flex at 36,000bps) B 43 V .90 at 32,000bps B 44 V .90 at 33,333bps B 45 V .90 at 34,667bp[...]

Abbreviated Command List Page 255 M 2 Speaker is always on M 3 Speaker is off whenever the modem is dialling or once a connection is established M 4 Speaker is on whenever the modem is dialling or answering. The speaker will also be on during retrains or rate changes. O 0 Enter on-line state O 1 Enter on-line state & force equaliser retrain (24[...]

Page 256 R 24 24,000 bps (locked terminal speed - no autobaud) R 26 26,400 bps (locked terminal speed - no autobaud) R 28 28,800 bps (locked terminal speed - no autobaud) R 38 38,400 bps (locked terminal speed - no autobaud) R 57 57,600 bps (locked terminal speed - no autobaud) R 76 76,800 bps (locked terminal speed - no autobaud) R 96 96,000 bps ([...]

Abbreviated Command List Page 257 & F1 Select non-error correction factory defaults & F2 Select synchronous mode factory defaults &G0 ■ Do not generate guard tones &G1 Generate guard tones of 550Hz &G2 Generate guard tones of 1800Hz &H0 ■ Clock always present in synchronous mode & H 1 Clock only appears after connect[...]

Page 258 #J1 ■ Check V .42 compatibility # K 0 Disable MNP 10 #K1 ■ Enable MNP 10 # K 2 Enable MNP 10 with cellular options #M0 ■ command operation # M 1 Asynchronous V .25bis # M 2 Synchronous V .25bis (HDLC framing) # M 3 Synchronous V .25bis (Char . framing-BSC mode) #N0 ■ NRZ Character Encoding # N 1 NRZI Character Encoding #O0 ■ Char[...]

Abbreviated Command List Page 259 % T 1 DCD is always high (only reset by &F .) %U0 ■ Standard error correction response codes % U1 V .42 response codes sent when a V .42 error corrected connection is established %U 2 Append /LAP-M or/REL (2,4,10) or /MNP-5 or /V .42bis or /DES messages to the CONNECT message when established %W0 ■ W elcome[...]

Page 260 4800, or 2400 12 ■ V .90 56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667, 44000, 42667, 41333, 40000, 38667, 37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000 5 6 K56flex 56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000, 40000, 38000, 36000, 34000, 32000 6 4 Bell 103 3 0 0 6 9 Bell 212 1200 - Q 0 Disable MNP10 fallback [...]

Abbreviated Command List Page 261 1 6 T est in Progress (read only) 0 0-8 1 8 T est T imer 0 0-255 2 5 DTR Loss Detection 5 0-255 2 6 R TS/CTS Delay 0 0-255 2 7 Delay Before Dial 0 0-255 2 9 Hook Flash Duration 50 10-100 3 0 Inactivity Timer 0 0-255 3 3 EQM Threshold V alue 3 0-255 3 8 Disconnect Delay 0 0-255 4 2 Modem Disconnect Reason 4 3 Break [...]

Page 262[...]

Glossary Page 263 Glossary A ACK (Acknowledge) Control Character transmitted by a receiving device as an affirmation to a sending device. Alphanumeric Roman Letters (alphabetic) and Arabic numbers (numeric). Amplitude The height of a waveform measured in volts. Amplitude Modulation (AM) Transmission of information by varying the amplitude of a carr[...]

Page 264 Auto dial The ability to make a connection with another modem automatically . (T o dial a number automatically . usually using a stored number .) Auto range The ability of a modem to range over several modem standards to determine the standard of the calling modem. B Bandwidth The range of signal frequencies that are accepted or passed by [...]

Glossary Page 265 Bit rate The speed at which bits are transmitted, usually expressed as bits per second (BPS). Block Group of characters treated as a unit for the purpose of data transmission. BPS An acronym for Bits Per Second. Transmission rate of binary numbers. Compare with Baud. Break A special, non-data signal used by computer equipment to i[...]

Page 266 Character Set The characters that can be coded or used by a particular machine. Clear to Send (CTS) An RS-232 control signal sent by the DCE to indicate that the DTE may begin a transmission. Clock Source of timing signals used in synchronous transmission. Code A predefined set of rules specifying the way data is to be represented by the t[...]

Glossary Page 267 Control Character Any character assigned as ASCII numeric code less than the SP ACE character . These characters are used to initiate a control function on the receiving device. Also a symbol you can create by pressing one of your computer ’ s keys while holding down the Control key . These symbols are not usually printed, and a[...]

Page 268 Data Communications Equipment Equipment that is used to access a communications network. The DCE provides all the functions required to establish, maintain and terminate a connection, and provides the signal conversion required for communications between the Data T erminal Equipment (DTE) and the telephone network. With RS-232 connections,[...]

Glossary Page 269 Default A value, action or setting that is automatically used by a computer system when no other explicit information has been given. Demodulate T o recover the information being transmitted by a modulated signal. For example, a conventional radio receiver demodulates an incoming broadcast signal top convert it into sound emitted [...]

Page 270 Double-Digit Keying Pressing two number keys in rapid succession to access a page in a videotex system. The first number accesses an intermediate index (see Intermediate Page) which in turn accesses the page. See also Single-Digit Keying. Dumb T erminal T erminals that do not contain an intelligent microprocessor and usually send data one [...]

Glossary Page 271 ENQ Control character used to enquire as to the identification or status of a remote device. Even Parity Even parity refers to the addition of a 0 value or 1 value bit to the data bits which form a character to cause an even number of 1 value data bits to be sent. See also Parity . ETX Control character which indicates the End of [...]

Page 272 Graphics Information in the form of pictures or images. Also, the display of pictures or images on a computer ’ s display screen. Guard Band Narrow frequency band left unused between adjacent channels to minimize interference. H Half Duplex Data transmission in which data may flow in either direction at one time, but not both directions [...]

Glossary Page 273 Header In communications protocols, this is the control information that precedes the message or text portion of a block of data. Hertz (Hz) Unit of frequency , one cycle per second. Horizontal Redundancy Checking (HRC) T echnique in which redundant information is included with a block of data for validating the transmitted data a[...]

Page 274 I/O Input/Output. The transfer of information into and out of a computer . ISO International Standards Organization. ITU International T elecommunications Union (formerly known as CCITT). ITU is the principal communications standards organisation. J Jack A socket used for telephone line or other electrical connections. K Kermit Kermit is a[...]

Glossary Page 275 Log on T o connect to or access a bulletin board or videotex system. Log Off T o disconnect from a bulletin board or videotex system. Longitudinal Redundancy Check Error detection technique that consists of a byte where each bit is calculated on the basis of the parity of all bits in the block in the same position. Loopback Direct[...]

Page 276 Multidrop Line Single communications circuit interconnecting many stations (nodes) each containing terminal devices. Multiplex T o interleave or simultaneously transmit two or more messages on a single channel. N NAK Negative Acknowledgement. This control character indicates that the last block transmitted was in error and that the receive[...]

Glossary Page 277 Packet Switched Network System where messages are transmitted in packets, each individually addressed and routed through the network. Packetised Ensemble Protocol (PEP) A patented data transmission technique used by the TrailBlazer modem to transmit data at up 18000 bps on the switched telephone network. Parity A simple method of [...]

Page 278 PROM Programmable Read Only Memory . Propagation Delay The time required for a signal to travel from one end of a circuit to another . Protocol A set of conventions controlling the timing and format of data communications between two pieces of communications equipment. Protocol Convertor Device that converts from one protocol to another . [...]

Glossary Page 279 Remote System Usually a bulletin board or videotex system that registered users or the public can dial up and communicate with via modem. Request to Send RS-232 control signal by the DTE to inform the DCE that it is ready to transmit data. When used for flow control between the DTE and the modem, this signal indicates to the modem[...]

Page 280 topic. Often SIGs set up bulletin boards, available only to SIG members. Simplex Data communications in one direction only . Single-Digit Keying Refers to videotex systems where you only need to press one numeric key from an index. See also Double-Digit Keying. Software Computer program or set of computer programs held in storage, and load[...]

Glossary Page 281 portion of the data block. SYN Synchronous Idle control character transmitted when the line is idle in synchronous transmissions. Synchronous A data transmission in which the time between characters is fixed by synchronising the transmitting and receiving communications equipment. The clock signal is typically derived from the dat[...]

Page 282 The message portion of a data block in synchronous data transmissions. T urnaround Time The time required to reverse the direction of transmission when operating in half duplex mode. U Upload Refers to sending files or text from the user ’ s computer to another user, a bulletin board or videotex system. (Many bulletin boards that offer p[...]

Glossary Page 283 An extension of the original XModem transfer protocol. Added features included transfer of file names, multi-file transfers, increased reliability of error checking and increased data throughput. Z ZModem Designed to rectify some of the limitations associated with YModem as well as providing support for high speed, packet and netw[...]

Page 284 Specifications Dimensions Height: 31mm Length: 218mm Width: 122mm Communications V .90 56,000bps (K56Flex proprietary standard) ITU-T 33600bps ITU-T 31200bps ITU-T V .34 (2400-33600bps) ITU-T V .32bis (14400bps) ITU-T V .32bis (1200bps) ITU-T V .32 (9600bps) ITU-T V .32 (7200bps) ITU-T V .32 (4800bps) ITU-T V .22bis (2400bps) ITU-T V .22 ([...]

Specifications Page 285 Data Formats Synchronous, Asynchronous: 7/8 data bits Flow Control R TS/CTS, XON/XOFF and T ransparent XON/XOFF (async mode only) Error Correction V .42, MNP 2-4, MNP10 Data Compression V .42bis, MNP 5 Encryption DES 64-bit Cypher Feedback (Aust only) SuperSecure Environmental Operating: 0° to +45° C Non-operating: -10° t[...]

Page 286 Product Warranty T elenetics warrants that the Product sold will be free from defects in material and workmanship and perform to T elenetics’ applicable published specifications for a period of 18 months from the date of delivery to Customer or 12 months from placement into service, whichever occurs first. The liability of T elenetics he[...]

RMA Procedure Page 287 RMA Procedure Return Merchandise Authorization (RMA) Procedure Before returning any T elenetics product, an RMA number must be obtained. Before asking for an RMA number , ascertain that the product was purchased from T elenetics. If you bought the product from a Distributor or Systems Integrator, the product should be returne[...]

Page 288 Compliances This device complies with Part 15A of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply w[...]

Compliances Page 289[...]