Multi-Tech Systems BL-Series manual

BL-Series Intelligent Data/Fax Modem User Guide[...]

User Guide 88312100 Revision A MultiModem II Models: MT2834BL/MT2834BLI/MT2834BLK MT1932BL/MT1932BLI/MT1932BL-Mac MT1432BL/MT1432BLI/MT1432BLK This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-Tech Systems, Inc. All rights reserved. Copyright 1999 ©, by Multi-Tech Systems, Inc. Multi[...]

Contents Chapter 1 - Introduction and Description 1.1 Introduction ................................................................................................................ ...................... 8 1.2 How T o Use This Manual ...................................................................................................... ........... 8 [...]

Chapter 4 - Manual Dial and Automatic Answer 4.1 Introduction ................................................................................................................ ...................... 36 4.2 Dialing/On-Line/Answering ................................................................................................... ........... 36 4.3 [...]

Chapter 8 - Modem T esting 8.1 Introduction ................................................................................................................ ...................... 98 8.2 Local Analog Loopback T est/V .54 Loop 3 ...................................................................................... .. 99 8.3 Digital Loopback T est/V [...]

vi[...]

Chapter 1 - Introduction and Description[...]

8 MultiModemBL User Guide 1.1 Introduction Welcome to the world of data communications. You have acquired one of the finest intelligent desktop data/fax modems available today, the MultiModem II BL series modem, from Multi-Tech Systems. This User Guide covers various models within the BL series, and unless otherwise noted, all content should be con[...]

9 Chapter 1 - Introduction and Description Chapter 5 - AT Command Mode Operation Chapter 5 may be the most important chapter of this manual. It begins with an introduction and discussion on Command Mode fundamentals. A flow chart is provided to illustrate Command Mode and On-Line Mode operation and the methods used in each mode. Next, there is a su[...]

10 MultiModemBL User Guide 1.3 Modem Features The MultiModem BL Series modem connections can be made on Public Switched Telephone Networks ( PSTNs ) and/or point-to-point 2-wire and 4-wire leased telephone type circuits. Your modem offers interactive automatic dialing, as well as Command Mode option configuration. You may store up to ten command li[...]

11 Chapter 1 - Introduction and Description 1.3.3 1432 Series Features Your MT1432BL modem is designed according to the international CCITT V.32 bis specification for data signalling rates as high as 14.4K bps in full-duplex mode. The major application for the MT1432BL is in 4-wire leased line networks (replacing traditional V.29/ 9600 bps & V.[...]

12 MultiModemBL User Guide 1.5 T echnical Specifications Your data/fax modem meets the specifications listed below: Tradename MultiModem IITM Model Numbers 2834 Series: MT2834BL, MT2834BLI, MT2834BLK 1932 Series: MT1932BL, MT1932BLI, MT2834BL-MAC 1432 Series: MT1432BL, MT1432BLI, MT21432BLK Data Rates (modem) 2834 Series: 33,600, 31,200, 28,800, 26[...]

13 Chapter 1 - Introduction and Description Data Compression All models: V.42bis, (4:1 throughput) or MNP 5 (2:1 throughput) data compression Speed Conversion 2834 and 1932 Series: Serial port data rates adjustable to 300, 1200, 2400, 4800, 9600, 19,200, 38,400, 57,600 and 115,200 bps 1432 Series: Serial port data rates adjustable to 300, 1200, 240[...]

14 MultiModemBL User Guide Fax Carrier Frequencies All models: V.21CH2 (Half Duplex) 1650Hz Mark, 1850Hz Space for Transmit Originate 1650Hz Mark, 1850Hz Space for Transmit Answer V.27ter 1800Hz Originate/Answer V.29 QAM 1700Hz Originate/Answer V.17 TCM 1800Hz Originate/Answer Lease Line Restoral All models: When in dial backup mode, modem attempts[...]

15 Chapter 1 - Introduction and Description Receiver Sensitivity All models: -43 dBm under worst case conditions AGC Dynamic Range All models: 43 dB Interface All models: EIA RS-232C/ITU V.24 Connectors BL models: One DB-25 RS-232C connector; three RJ11 for phone line, dial-up and leased line; power. BLK models: One DB-25 RS-232C connector; two BT [...]

16 MultiModemBL User Guide 1.6 Power Power is supplied through an AC power transformer terminated with a standard two-prong plug. The transformer supplies low voltage AC to the modem, and plugs into any conventional 115 volt AC, 60 Hz, two-prong power outlet (240 volts AC, 50Hz, .3 Amp for International modems). The power transformer supplied with [...]

17 Chapter 1 - Introduction and Description (24.0) 24,000 bps. (2834 models only). This LED is lit when the modem is connected at 24,000 bps. Note: if the modem falls back to 21.6K bps while in V.34 mode, both the 24.0 and 19.2 LEDs light. (19.2) 19,200 bps. (2834 and 1932 models only) This LED is lit when the modem is connected at 19,200 bps. (14.[...]

18 MultiModemBL User Guide[...]

Chapter 2 - Installation and Connection[...]

20 MultiModemBL User Guide 2.1 What is in Y our Modem Package? Your MultiModem is made up of many components. Make sure you have them all before trying to operate your modem. MADE IN U.S.A MADE IN U.S.A Figure 2-1. Unpacking (MT2834BL shown) Your package should include: • MT2834BL, MT1932BL or MT1432BL data/fax modem • RJ-11 telephone cord or B[...]

21 Chapter 2 - Installation and Connection 2.2 Installation The installation of the modem consists of making the physical connections necessary to render the modem functional with your computer. This includes making the proper serial, phone line, and power connections. Unless otherwise noted, these instructions apply to all models of the BL series.[...]

22 MultiModemBL User Guide PHONE PSTN ON OFF POWER EIA RS232C VOLUME LEASE Figure 2-2. MultiModemBL/BLI Connections 4 Attach the EIA RS-232C connector on the modem to the serial port on your computer or terminal with an RS-232 (or V.24) cable (you supply). Refer to Figure 2-2. 5 To connect a telephone set to the modem (optional) plug one end of an [...]

23 Chapter 2 - Installation and Connection 2.2.4 Cabling Procedure (MT1432BLK and MT2834BLK) Step Procedure 1 Verify that the settings for DIP-Switch #5 and DIP-Switch #10 match those of your system configuration. The 16-position DIP-Switch (numbered 1-16) is accessible through a cut-out on the right side (as the LEDs are facing you) of the modem c[...]

24 MultiModemBL User Guide 2.3 Loading T rio DataF AX Software The following procedure will guide you through the installation of Trio DataFAX software. The procedure does not provide every screen or option in the process. The installation utility provides on- screen instructions for those elements that are not covered in this procedure. If you enc[...]

25 Chapter 2 - Installation and Connection 9 Click Yes to read the Release Notes . when you are finished, close the release notes dialog and the Trio Setup dialog is displayed. 10 Click Complete Installation and the installation introduction is presented. 11 Click Next Dialog and follow the on-screen instructions to load the software. Once the soft[...]

26 MultiModemBL User Guide 15 Click Next Dialog . The Phone Numbers and Prefixes dialog is displayed. 16 Follow the on-screen instructions and when you are finished, click Next Dialog . The following dialog is displayed: 17 Click OK, Exit the Installation Program . The Trio Applications program group is displayed. Your Trio software is loaded. If y[...]

Chapter 3 - Software Configuration and Modem Basics[...]

28 MultiModemBL User Guide 3.1 Introduction Chapter 2 guided you through the installation of Trio communications software. If you are using a different software package, there are some points you should take into consideration. Since your communications software configuration is affected by the capabilities of your computer, this chapter begins wit[...]

29 Chapter 3 - Software Configuration 3.2.2 The 16550 UART and Windows 3.1 Windows 3.1 may cause a loss of data when communicating at high speed, even with a 16550 UART installed. Because Windows is multitasking—it switches between several programs running at the same time—it can make the serial port wait briefly while Windows performs other ta[...]

30 MultiModemBL User Guide 3.4 PC Initialization Strings We recommend the following initialization string for a MultiModem connected to a PC-compatible computer when sharing a line with a telephone: AT &F X4 S0=0 ^M This string resets the modem to the factory default settings, selects extended result codes with NO DIAL TONE and BUSY, and turns [...]

31 Chapter 3 - Software Configuration 3.5 Macintosh Initialization Macintosh computers cannot use RTS/CTS hardware flow control without a serial cable wired for hardware control. The Macintosh 128 and 512 models cannot use RTS/CTS flow control at all. For those Macintoshes turn off the default RTS/CTS hardware flow control, turn on XON/XOFF flow co[...]

32 MultiModemBL User Guide 3.6.3 File T ransfer Protocols When you upload or download files with your modem, the host computer will ask which file transfer protocol you want to use. Most communications programs allow you to choose a default protocol. Your software’s documentation should list the ones it can use (not all communications programs su[...]

33 Chapter 3 - Software Configuration 3.8 Modem Basics You control your modem by issuing AT commands, setting S-Registers, and setting DIP-Switches. You can easily change the settings of your DIP-Switches, as they are located on the right side of your modem’s chassis. Right now your modem is set up for the most typical user application, that is, [...]

34 MultiModemBL User Guide[...]

Chapter 4 - Manual Dial and Automatic Answer[...]

36 MultiModemBL User Guide 4.1 Introduction We’ll assume that yours is the very common application, where you are using a modem to dial up a remote computer. The modem has been factory preset for originating a call to a compatible 33,600 bps modem (also set up for hardware flow control, V.42 error correction, V.42 bis data compression and CTS/RTS[...]

37 Chapter 4 - Manual Dial and Automatic Answer 4.3 Automatic Leased Line Restoral Operation When the modem is in Dial Backup mode, it periodically checks the leased line to see if it's operational and tries to restore the leased line if possible. S-Register S18 determines how often restoral attempts occur. The default for S18 is 30 minutes, a[...]

38 MultiModemBL User Guide 4.6 Dial-Up Operation When your modem is used as a dial-up modem (DIP-Switch #10 in the UP position), it can both originate and answer calls. To originate calls, you use the automatic dialing capability of the modem's Command mode. To do this, use the computer or terminal keyboard to enter a few command letters, foll[...]

39 Chapter 4 - Manual Dial and Automatic Answer 4.8 Automatic Answering The modem can be used as an automatic answering modem. No special modifications or settings are required other than making sure that the Auto-Answer select switch is set to Auto-answer enabled (DIP-Switch #5 UP). The modem, when in its idle state, is set for Originate mode freq[...]

40 MultiModemBL User Guide 4.10 Handshaking Details This section briefly explains what happens between two modems in a normal call. We are assuming that there are MultiModems at both the originating and at the answering end of the telephone line. (If other brands of modems are used with our modems, they will still communicate, but each manufacturer[...]

Chapter 5 - Command Mode[...]

42 MultiModemBL User Guide 5.1 Introduction AT commands are the means by which you, and your communications software, are able to communicate with and configure your modem. They enable you to establish, read, and modify parameters in addition to dialing. The following provides both a summary and a detailed explanation of the AT commands recognized [...]

43 Chapter 5 - Command Mode 5.1.2 Functional Modes The MultiModem can be in one of two functional states (see Figure 5-1). These are "Command mode" and "On-line mode" . (There is also an in-between state, "Wait-for-Carrier" , where the modem is out of Command mode but not yet really On-Line. When the modem is initially[...]

44 MultiModemBL User Guide 5.2 Summary of A T Commands A wide variety of autodial operations and modem options can be controlled when the modem is in Command Mode. Remember, nearly all commands begin with AT . These commands are organized into several functional groups. An alphabetical summary of commands is provided in Appendix D. HOW TO COMMANDS [...]

45 Chapter 5 - Command Mode CONTROL RS232C &C Carrier Detect Control INTERFACE &D Data Terminal Ready Control &R Clear To Send Control &S Data Set Ready Control &RF CTS/RTS Control &SF DSR/CD Control CONFIGURE &E0 Normal Mode ERROR &E1 Auto-Reliable Mode CORRECTION &E2 Reliable Mode #L0 Negotiate V.42 Mode During[...]

46 MultiModemBL User Guide EXECUTE %DF Format Line Probe Display (Graph or Table Format) LINE %DP Enable/Disable Reading Line Probe From DSP during handshake PROBE L9 Display of Signal Strength Information COMMANDS L10 Display Signal to Noise Ratio ( SNR ) (2834 Series only) L11 Display of Noise Information &RP Initiates Retrain to Read Line Pr[...]

47 Chapter 5 - Command Mode 5.3 Result Codes The Command mode provides you with several responses, or “Result Codes” , that can aid you in Command mode operation. These Result Codes are displayed on your video monitor. You can choose result codes that closely match those of the standard AT command set, or choose enhanced function result codes t[...]

48 MultiModemBL User Guide "Standard AT" Result Codes 2834 Series TERSE VERBOSE TERSE VERBOSE 0 OK 11 CONNECT 4800 1 CONNECT 12 CONNECT 9600 2 RING 13 CONNECT 14400 3 NO CARRIER 19 CONNECT 19200 4 ERROR 2 1 CONNECT 21600 5 CONNECT 1200 2 4 CONNECT 24000 6 NO DIALTONE 26 CONNECT 26400 7 BUSY 28 CONNECT 28800 8 NO ANSWER 31 CONNECT 31200 9 [...]

49 Chapter 5 - Command Mode 5.4 Dialing Commands 5.4.1 Dialing Action Commands Dial Command D The letter D in a command causes the modem to dial the telephone number immediately following it. For example, if you enter ATD5551212 and hit RETURN, the modem dials the number 555-1212. The D command is also used in conjunction with a telephone set for m[...]

50 MultiModemBL User Guide To activate DTR Dialing, enter AT$D1 and hit RETURN. The modem dials the phone number stored in the N0 location of memory when it receives a high DTR signal. DTR must remain high for the duration of the call, until disconnect. To deactivate DTR dialing, enter AT$D0 and hit RETURN. Note when using DTR Dialing in a synchron[...]

51 Chapter 5 - Command Mode Automatic Pauses in Dialing , You can cause the modem to pause during the dialing sequence by entering a comma character where the pause is desired. This pause lasts two seconds. If a longer pause is desired, more than one comma may be entered consecutively, with each comma causing a two second pause. You also have the o[...]

52 MultiModemBL User Guide "Calling Card" Detect Tones $ The modem has the capability to detect AT&T "calling card" tones for the purpose of utilizing the user's calling card number to originate an on-line connection. An $ symbol placed in the dialing string causes the modem to pause and wait for an AT&T "calli[...]

53 Chapter 5 - Command Mode 5.4.3 Phone Number Memory Commands Storing Phone Numbers D...N A telephone number and command line of up to sixty characters may be stored in the modem’s number memory. As many as ten of these numbers may be stored. Each number will be given a name, using the codes N0, N1, N2 up to N9. A phone number is stored by enter[...]

54 MultiModemBL User Guide 5.4.4 Configuration and Default Storage Commands Store Configuration & S-Register Parameters in Non-Volatile Memory &W The modem can store configuration parameters and S-Register values in its nonvolatile read/write Random Access Memory (RAM) memory. The &W command does this, which prevents any re- configurati[...]

55 Chapter 5 - Command Mode Unix UUCP Spoofing $SP The modem can be configured in a Unix environment that employs ACK flow control as a means of monitoring data integrity. The modem can do “UUCP spoofing” , where the modem is able to generate ACKs at the DTE interface. Data is transmitted more time efficiently because the delay of waiting for d[...]

56 MultiModemBL User Guide 5.4.5 Command Response (Result Code) Commands Echo Command Mode Characters E If the modem is connected to a full-duplex computer, it may be necessary for the modem to be configured to echo back characters entered while in the Command Mode in order for them to be displayed. The E command is used to configure the Command Mo[...]

57 Chapter 5 - Command Mode Result Codes (Basic and Extended) and Call Progress Selection X The X Command is used to select one of two possible dialing methods ( “dumb” or “smart” ), and to select various response combinations related to these methods. You can choose to have certain responses suppressed, or whether or not you want speed ind[...]

58 MultiModemBL User Guide 5.4.6 Phone Line Conditioning Commands Guard Tones (Not Used in BLI or BLK Models) &G The &G command is used to control the presence or absence of guard tones from the transmitter when in Answer mode, at either 1200 or 2400 bps. Guard tones are used in Europe and other areas for the modem to function in the teleph[...]

59 Chapter 5 - Command Mode Fallback Modes When On-Line #F If line conditions deteriorate, the modem automatically drops its transmission speed ( “fallback” ). The #F command controls the different ways the modem falls back. During operation, if the error rate becomes too great, the modem performs a retrain. If after the retrain, the error rate[...]

60 MultiModemBL User Guide Auto Speed Detect #A The function of the #A command is to detect and select the operational data rates (the “starting” speeds) with which the modem uses for initial handshake and speed selection. Remember, this command does not control the originating data rate of the modem (that is done by the Modem Baud Rate command[...]

61 Chapter 5 - Command Mode 5.4.7 RS-232C Interface Control Commands Carrier Detect Control &C The &C command allows you to control the status of the Carrier Detect signal (CD-Pin 8) on the RS- 232C line. You have four choices. You can force the signal high, or allow it to act normally, or force the modem to reset when CD drops, or set it t[...]

62 MultiModemBL User Guide Data Set Ready Control &S The &S command allows you to control the status of the Data Set Ready signal (DSR - pin 6) on the RS-232C interface. You have three choices. You can force the signal high, allow it to act normally, or set it to stay high until the modem disconnects, go low momentarily, and then go high ag[...]

63 Chapter 5 - Command Mode 5.4.8 Error Correction Commands You can use AT commands to place your modem one of three V.42 (error correction) modes of operation. These are the Normal, Auto-Reliable, and Reliable modes. Normal Mode &E0 In Normal mode of operation, the modem’s V.42 error correction capabilities are disabled, and the modem functi[...]

64 MultiModemBL User Guide V.42 Mode Select #L The V.42 standard implements both MNP Class 3 & 4 and LAP-M error correction methods. The V.42 Mode Select command (#L) selects which type of error correction (MNP or LAP-M) your modem uses for transmissions. The various #L command options are as follows. #L0 Command The #L0 Command allows a pair o[...]

65 Chapter 5 - Command Mode Enable/Disable Auto Reliable Fallback Character $F In Auto-Reliable mode, the modem is given four seconds to establish a Reliable connection. If a single CARRIAGE RETURN is received from the remote modem during this four second period, the Auto-Reliable modem assumes that the remote modem is not in Reliable mode and drop[...]

66 MultiModemBL User Guide 5.4.9 Flow Control Commands Flow control refers to the techniques used by computer devices to stop and restart the flow of data to and from each other. Flow control is necessary so that a device does not receive more data than it can handle. In the case of the MultiModem, there is a need for flow control in both direction[...]

67 Chapter 5 - Command Mode Xon/Xoff Pass-Through &E7 So far, you have had three choices to make regarding pacing: 1. You can set the modem to respond to Xon/Xoff pacing. 2. You can set the modem to respond to RTS pacing. 3. You can set the modem to ignore pacing completely. Well, we’re not done with pacing yet. There’s another choice you c[...]

68 MultiModemBL User Guide Normal Mode Modem Flow Control On &E11 When two MultiModems are connected in Normal mode (not using error correction), Xon/Xoff can be used to control the flow of data between the modems. Flow Control can be turned on or off with the Normal Mode Modem Flow Control commands. When the modems are connected in Reliable mo[...]

69 Chapter 5 - Command Mode 5.4.10 Compression, Error Correction, Flow Control, Pass- Through and Pacing Commands The modem has a variety of commands to control its error correction and data compression options. These additional commands are listed below. (Remember to precede each command with the AT characters.) Normal/Auto-Reliable/Reliable Mode [...]

70 MultiModemBL User Guide 5.4.1 1 Speed Conversion Commands Speed conversion is a necessary part of data compression since data must be presented to the modem faster than it can handle data, if data compression is to be effective. Speed conversion allows the modem to communicate at one speed over the phone line, and at another speed at the RS-232C[...]

71 Chapter 5 - Command Mode 1932 Series: AT$MB75 = CCITT V.23 AT$MB300 = 300 bps AT$MB1200 = 1200 bps AT$MB2400 = 2400 bps AT$MB4800 = 4800 bps AT$MB9600 = 9600 bps AT$MB14400 = 14400 bps AT$MB19200 = 19200 bps The factory default is 19200 bps. 1432 Series: AT$MB75 = CCITT V.23 AT$MB300 = 300 bps AT$MB1200 = 1200 bps AT$MB2400 = 2400 bps AT$MB4800 [...]

72 MultiModemBL User Guide Serial Port Baud Rate $SB The $SB command presets the speed of the modem’s serial (RS-232C) port, in both Originate and Answer modes. Speed conversion allows you to set this serial port baud rate at a fixed speed of up to 115,200 bps for 1932 and 2834 models, and 57600 bps for 1432 models, regardless of the modem’s tr[...]

73 Chapter 5 - Command Mode 5.4.12 Immediate Action Commands Help Screens $H The Help command is designed to give you short explanations on how to use each modem command. The Help command can be quite useful if your manual is not handy and you are in the middle of a communications session. Although the explanations are quite abbreviated compared to[...]

74 MultiModemBL User Guide Listing On-Line Diagnostics L8 The L8 command displays the current on-line CONNECT status of the modem. This display can be printed and used as a modem status report or as diagnostic information (such as when calling Tech Support). To activate this command first type +++AT<CR> ( on-line escape command while maintain[...]

75 Chapter 5 - Command Mode Force Answer Mode A You can force the modem into Answer mode with the modem’s A command. Entering ATA when in Command mode immediately brings your modem off-hook, out of Command mode and into On-Line Answer mode, and causes it to transmit its carrier signal over the phone line. If no responding carrier tone is received[...]

76 MultiModemBL User Guide[...]

Chapter 6 - S-Registers[...]

78 MultiModemBL User Guide 6.1 Introduction Certain Command Mode configurations are stored in memory registers called, S-Registers. The S command is used to assign a value to, and to read the current value of an S-Register. To assign a value to an S-Register, enter the letter S , followed by the S-Register number and an equals sign ( = ), and then [...]

79 Chapter 6 - S-Registers S4 Line Feed Character Unit: ASCII Character Range: 0-127 Default: 10 (^J) Description: S4 defines the character recognized as Line Feed. S3 may be set for any ASCII character. S5 Backspace Character Unit: ASCII Character Range: 0-127 Default: 8 (^H) Description: S5 defines the character recognized as BACKSPACE. S5 may be[...]

80 MultiModemBL User Guide S9 Carrier Detect Response Time Unit: 100 mSec. Range: 1-255 Default: 6 Description: S9 sets the time delay between when the modem first detects a valid incoming carrier signal and when the modem turns on its Carrier Detect circuit. The default setting is 600 milliseconds, or six units of 100 mSec each (Decimal 6). S9 may[...]

81 Chapter 6 - S-Registers S15 Callback Time Delay Unit: Seconds Range: 10-255 Default: 20 Description: S15 defines the time delay between Callback attempts after initial passwords have been exchanged between modems. Refer to Chapter 7 for Callback Security information. S16 Callback Attempts Unit: 1 Attempt Range: 1-255, 1-2*** Default: 4, 2*** Des[...]

82 MultiModemBL User Guide S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD Unit: 50 mSec. Range: 0-255 Default: 20 Description: Some PBX and CBX phone systems require the modem’s DSR, CTS, and/or CD signal(s) to behave in a certain manner when calls are disconnected. The modem’s &R , &S , and &C commands cause the modem to drop thes[...]

83 Chapter 6 - S-Registers S30 Inactivity Timer Unit: 1 min. Range: 0-255 Default: 0 Description: S30 causes the modem to disconnect if no data is transmitted or received for a specified time. This timer runs during both Reliable and Normal error correction connections. The timer restarts any time a data character is passed through the serial port [...]

84 MultiModemBL User Guide S48 Program V.34bis Connect Speeds (2834 Series only) Unit: N/A Range: 33, 31, 28, 26, 24, 21,19,16,14,12, 96 and 48 Default: 0 Description: Defines which speed modem connects within the scope of Enhanced V.34 mode (e.g., S48 = 26 means maximum connect speed is 26.4K). This register compensates for line conditions that ha[...]

85 Chapter 6 - S-Registers 6.2 Reading and Assigning S-Register V alues The S command is used to assign a value to, and to read the current value of, an S-Register. To read an S-Register value, enter the letter S followed by the S-register number and a question mark ( ? ), then hit RETURN. For example, entering ATS7? and hitting RETURN displays the[...]

86 MultiModemBL User Guide 6.3 A T Command and S-Register Summary The vast majority of installations are similar, with the modem being used to dial up a remote installation where the call is automatically answered. Your modem has a default configuration to dial another modem that supports error correction, data compression and flow control. If the [...]

Chapter 7 - Callback Security and Remote Configuration[...]

88 MultiModemBL User Guide 7.1 Introduction This chapter describes how the MultiModem’s Callback and Remote Configuration features operate. These features use a multilevel security system, which involves the use of LOGIN Passwords, Setup Passwords and Remote Escape Characters. The primary level security code is the modem’s LOGIN Password. Once [...]

89 Chapter 7 - Callback Security and Remote Configuration 7.3 Remote Configuration Description The Remote Configuration feature is a network management tool that allows you to configure modems remotely. This means you could configure modems anywhere in your network from one location without having to visit the sites or rely on remote users to follo[...]

90 MultiModemBL User Guide To turn your modem's Callback Security feature on and off: 7. If you want Callback Security with both remote and local password security, enter AT#DB1 and hit RETURN. You must turn on Callback Security to be able to enter dial back phone numbers. 8. If you want Callback Security on with just remote password security,[...]

91 Chapter 7 - Callback Security and Remote Configuration The + and/or - characters entered before the phone number are optional. The + (Deposit Number) code allows a caller to enter the number he or she wishes the Callback modem to call back when the caller uses a particular password (Step 3 of Table 7-3). The - character enables direct entry when[...]

92 MultiModemBL User Guide 7.3.2 Remote Configuration Procedures The procedures for using the Remote Configuration features are the same whether or not a call originates from the remote modem. Once the modem is on-line, perform the procedures in Table 7-4. Table 7-4 Remote Configuration Operation Procedures Step Procedure 1. Remote Escape Configura[...]

93 Chapter 7 - Callback Security and Remote Configuration 7.4 Remote Configuration and Callback Security A T Commands The following AT commands are used with Remote Configuration and Callback Security features. Assign Passwords for Callback Phone Numbers #CBN When you have callback security enabled for the modem, anyone trying to connect with the m[...]

94 MultiModemBL User Guide Erase Callback Password #RCBNxx This command erases the single callback password specified by xx (0 through 29). Erase Callback Phone Number #RDNxx This command erases the single phone number specified by xx (0 through 29).[...]

95 Chapter 7 - Callback Security and Remote Configuration 7.5 Remote Configuration/Callback Security S-Registers The following S-Registers are used with Remote Configuration and Callback Security features. Remote Configuration Character (S13) S13 defines the modem’s remote configuration escape character. When the S13 character is entered three co[...]

96 MultiModemBL User Guide[...]

Chapter 8 - Modem T esting[...]

98 MultiModemBL User Guide 8.1 Introduction Each time you power up the MultiModem, it performs an automatic self- test to ensure proper operation. The modem also has four diagnostic test features: Local Analog Loopback, Digital Loopback (remote/automatic), Digital Loopback (local/manual) and a modem Back-to-Back test. A loopback test involves enter[...]

99 Chapter 8 - Modem Testing 8.2 Local Analog Loopback T est/V .54 Loop 3 In this test, data from your computer or terminal is sent to your modem's transmitter, converted into analog form, looped back to the receiver, converted into digital form and then received back at your monitor for verification. No connection to the phone line is require[...]

100 MultiModemBL User Guide 8.3 Digital Loopback T est/V .54 Loop 2 (Local/Manual) In this test, your modem must be On-Line with another modem that can respond to a request for Digital Loopback, such as another MultiModem. The Digital Loopback Test is an on-line test that loops data sent from one modem across the phone line to another modem, then b[...]

101 Chapter 8 - Modem Testing 8.4 Digital Loopback T est/V .54 Loop 2 (Remote/Automatic) In this test, your modem must be On-line with another modem set up to respond to a request for Digital Loopback, such as another MultiModem. With the MultiModem, this ability to respond is controlled by the &T command. AT&T4 enables the response to Digi[...]

102 MultiModemBL User Guide 8.5 Back-to-Back T est This test lets you connect two MultiModems with an RJ-11 cable to verify proper operation. Using a modem that is known to be operational, you can test a second modem that is suspect. 1. Plug the modular ends of an RJ-11 cable into both MultiModem’s LEASE jack connectors. 2. Force DTR ON in both l[...]

103 Chapter 8 - Modem Testing 8.6 Synchronous Mode T esting The following tests must be run with your modem in Synchronous mode (DIP Switch #12 in the Up (OPEN) position), DIP Switch #9 controls the modem’s Synchronous mode testing function. (Refer to Chapter 9 for DIP Switch information.) The test procedures for Synchronous mode are different fr[...]

104 MultiModemBL User Guide 8.8 Digital Loopback T est (Local/Manual) (Synchronous Mode) This test must be run when you have a data connection with another modem. If a Local Analog Loopback Test resulted in errors, and this test passes without errors, then the problem exists in your computer-to-modem connection. In Digital Loopback Test (local/manu[...]

105 Chapter 8 - Modem Testing 8.9 Digital Loopback T est (Remote/Automatic) (Synchronous Mode) This test must be run when you have a data connection with another modem. In this test, data is passed to the remote modem and is looped back to the local modem (as if an ATU2 command was issued in Asynchronous test mode), as shown in Figure 8-7. This let[...]

106 MultiModemBL User Guide[...]

Chapter 9 - DIP-Switch Settings[...]

108 MultiModemBL User Guide 9.1 Introduction There are several DIP-Switch options on the modem’s printed circuit (PC) board. The DIP-Switches are accessible through a cut-out on the side of the modem. This chapter explains the modem’s printed-circuit board options. Sixteen DIP-Switch settings and the modem's speaker volume control are expl[...]

109 Chapter 9 - DIP-Switch Settings 9.2 DIP-Switch Option Settings Switch #1 Forced DTR -- "DTR" (Asynchronous/Synchronous Mode/Leased Line/Dial-Up) The modem must have a high DTR signal in order to operate. DTR is provided to the modem by the terminal or computer to which it is attached, through pin 20 of the RS-232C/V.24 interface. If y[...]

110 MultiModemBL User Guide *Switch #3 dB Transmission Levels (Asynchronous/Synchronous Mode/Leased Line) 2834 Series: DIP-Switch #3 adjusts dB transmission levels required by some phone carriers. Place DIP-Switch #3 in the DOWN position to enable -9 dB transmission. Place DIP-Switch #3 in the UP position to enable -15 dB transmission. -9dB Transmi[...]

111 Chapter 9 - DIP-Switch Settings Switch #5 Enable/Disable Auto-Answer - "Ans" (Asynchronous Mode/Synchronous Mode/Dial-Up) In some originate-only applications, you may wish to disable the modem’s automatic answering capabilities. This may be true if you have a telephone set attached to a modem and wish to receive voice calls that you[...]

112 MultiModemBL User Guide Switch #7 Request To Send Forced - "RTS" (Asynchronous/Synchronous Mode/Leased Line/Dial-Up) If your computer or terminal uses RTS-CTS protocol (typically used in some synchronous applications, but also if using hardware pacing for V.42 error correction or speed conversion), you may want to set RTS to function [...]

113 Chapter 9 - DIP-Switch Settings Switch #11 "AT" Responses/Multi-Tech Responses (Asynchronous Mode/Leased line/Dial-Up) In Asynchronous mode, you can set the modem to respond with Result Codes according to the "Multi-Tech " command response set (Switch #11 in the DOWN position), or to "AT" command response set (Swit[...]

114 MultiModemBL User Guide 1932 Series: 19200 bps Operation = Switch #13 UP and Switch #14 UP 14400 bps Operation = Switch #13 DN and Switch #14 UP 9600 bps Operation = Switch #13 UP and Switch #14 DN 2400 bps Operation = Switch #13 DN and Switch #14 DN Factory Default Setting = Switch #13 UP and Switch #14 UP 1432 Series: 14400 bps Operation = Sw[...]

115 Chapter 9 - DIP-Switch Settings 9.4 Recording Option Configurations This section lets you record any changes you may have made to the DIP-Switch settings. Circle the appropriate setting and record the effect for future reference. DIP-Switches Switch Function Position Effect #1 Force DTR/DTR from Interface* UP* DOWN #2 Flow Control &E4*/&[...]

116 MultiModemBL User Guide DIP Switches #13-14 Note: The modem baud rate command ( $MBn ) overrides the setting of these speed selection switches (DIP switches #13 and #14). 2834 Series: SWITCH CONDITION EFFECT #13/#14 UP/UP* 28.8 K bps Operation #13/#14 DOWN/UP 19.2 K bps Operation #13/#14 UP/DOWN 14.4 K bps Operation #13/#14 DOWN/DOWN 9600 bps O[...]

Chapter 10 - W arranty , Service and T ech Support[...]

118 MultiModemBL User Guide 10.1 Introduction This chapter starts out with statements about your modem's 5-year warranty. The next section, Tech Support, should be read carefully if you have questions or problems with your modem. It includes the technical support telephone numbers, space for recording your modem information, and an explanation[...]

119 Chapter 10 - Warranty, Service and Tech Support 10.3 T ech Support Multi-Tech has an excellent staff of technical support personnel available to help you get the most out of your Multi-Tech product. If you have any questions about the operation of this unit, call 1-800-972- 2439. Please fill out the modem information (below), and have it availa[...]

120 MultiModemBL User Guide 10.5 The Multi-T ech BBS For customers who do not have Internet access, Multi-Tech maintains a bulletin board system (BBS) that mirrors its FTP site. Information available from the BBS includes new product information, product upgrade files, and problem-solving tips. The phone number for the Multi-Tech BBS is (800) 392-2[...]

121 Chapter 10 - Warranty, Service and Tech Support 10.5.1 Upgrading the MultiModem The MultiModem has a Flash PROM which contains firmware code for the hardware and DSP code for the digital signal processor chips. At various times, Multi-Tech may add enhancements and/or fixes to the firmware. The flash technology used in the MultiModem lets you lo[...]

122 MultiModemBL User Guide 10.8 About Ordering Accessories SupplyNet, Inc. can supply you with replacement transformers, cables and connectors for select Multi-Tech products. You can place an order with SupplyNet via mail, phone, fax or the Internet at: Mail: SupplyNet, Inc. 614 Corporate Way Valley Cottage, NY 10989 Phone: 800 826-0279 Fax: 914 2[...]

Appendixes[...]

124 MultiModemBL User Guide Appendix A - T roubleshooting Your modem was thoroughly tested at the factory before it was shipped. If you are unable to make a successful connection or if you experience data loss or garbled characters during your connection, it is possible that the modem is defective. However, it is more likely that the source of your[...]

125 Appendix A - Troubleshooting • If you don’t get an OK , the problem may still be in the communications software. Make sure you have done whatever is necessary in your software to make a port connection. Not all communications programs connect to the COM port automatically. Some connect when the software loads and remain connected until the [...]

126 MultiModemBL User Guide The Modem Dials But Cannot Make a Connection There can be several reasons the modem fails to make a connection. Possibilities include • lack of a physical connection to the telephone line. • a wrong dial tone. • a busy signal. • a wrong number. • no modem at the other end. • a faulty modem, computer, or softw[...]

127 Appendix A - Troubleshooting The Modem Disconnects While On-line • If you have call waiting on the same phone line as your modem, it may interrupt your connection when someone tries to call you. If you have call waiting, disable it before each call. In most telephone areas, you can disable call waiting by preceding the telephone number with *[...]

128 MultiModemBL User Guide I Am Losing Data • If you are using data compression and a high speed serial port, set the serial port baud rate to four times the data rate. • Your UART may not be reliable at serial port speeds over 9600 bps or 19,200 bps. Turn off data compression, reset your serial port speed to a lower rate, or replace your seri[...]

129 Appendix B - ASCII Conversion Chart Appendix B - ASCII Character Code/Hex/Decimal Conversion Chart CTRL CODE HEX DEC CODE HEX DEC CODE HEX DEC CODE HEX DEC @ NUL 00 0 SP 20 32 @ 40 64 60 96 A SO H 01 1 ! 21 33 A 41 65 a 61 9 7 B ST X 02 2 “ 22 34 B 42 66 b 62 9 8 C E TX 03 3 # 23 35 C 43 67 c 63 9 9 D E OT 04 4 $ 24 36 D 44 68 d 64 1 00 E E N[...]

130 MultiModemBL User Guide Appendix C - Dial Pulse and T one-Dial Frequencies Dial Pulses Closed Open B A Digit 2 Digit 1 In the example above, the digit 2 is pulse dialed, followed by the digit 1. Each pulse consists of an A mSec. open and a B mSec. closed, where A will be either 60 or 67 mSec and B will be either 40 or 33 mSec., for a total of 1[...]

131 Appendix D - AT Command Summary Appendix D - Command Summary Command Values Description AT Attention Code that precedes most command strings except A/, A: and Escape Codes. RETURN Pressing RETURN key executes most commands. $ This symbol placed in dialing string enables the modem to detect AT&T's "call card" tones for accessi[...]

132 MultiModemBL User Guide Command Values Description ***B n n = 0 or 1 * B0 selects V.21 answer tone. B1 selects Bell answer tone. &B n n = 0 or 1 * &B0 means normal transmit buffer size. &B1 means reduced transmit buffer size. &BS n n = 0 or 1 &BS0 means maximum transmit block size of 64 characters. * &BS1 means maximum t[...]

133 Appendix D - AT Command Summary Command Values Description &E n n = 0 thru 15 &E0 means no error correction. * &E1 means V.42 Auto-reliable Mode. &E2 means V.42 Reliable Mode. &E3 means no modem-initiated flow control. * &E4 means CTS modem-initiated flow control. &E5 means Xon/Xoff modem-initiated flow control. * &a[...]

134 MultiModemBL User Guide Command Values Description $H n n = 1 thru 3 $H1 brings up Help Screen #1. $H2 brings up Help Screen #2. $H3 brings up Help Screen #3. I n n = 0,1or 2 I0 requests modem ID #. I1 requests firmware revision #. I2 for MTS internal use. I9 (2834 Series only) Read Only Command enables display of Windows 95 Autodetect characte[...]

135 Appendix D - AT Command Summary Command Values Description 1432 Series: $MB75 selects CCITT V.23 mode. $MB300 selects 300 bps on-line. $MB1200 selects 1200 bps on-line. $MB2400 selects 2400 bps on-line. $MB4800 selects 4800 bps on-line. $MB9600 selects 9600 bps on-line. * $MB14400 selects 14400 bps on-line &M n n = 0 or 1 * &M0 selects [...]

136 MultiModemBL User Guide Command Values Description S r? r = 0-11, 13, Reads value of Register “r” and displays 15-19, 24-26, value in 3-digit Decimal format. 30, 32 or 34... $SB n n = speed 2834 and 1932 Series: $SB300 selects 300 bps at serial port. $SB1200 selects 1200 bps at serial port. $SB2400 selects 2400 bps at serial port. $SB4800 s[...]

137 Appendix D - AT Command Summary Command Values Description V n n = 0 or 1 V0 means Result Codes sent as digits (terse response). * V1 means Result Codes sent as words (verbose response). W Wait for new dial-tone. &W n n = 0 or 1 &W0 causes modem to store its current parameters in non-volatile RAM, and modem will load these for future se[...]

138 MultiModemBL User Guide Callback Security/Remote Configuration Command Summary Command Description #DBn #DB0 disables Callback Security and answering Yes to the prompt turns off Callback Security and erases stored phone numbers and passwords. Answering No to the prompt aborts the command. #DB1 activates remote and local password security. #DB2 [...]

139 Appendix D - AT Command Summary Password Command Summary Command Description #Ixxxxxxxxxx Login Password is any keyboard characters (x) (upper/lower case sensitive), minimum 6 and maximum 10 characters. The default Login Password is #IMULTI-TECH . #Syyyyyyyyyy Setup Password is any keyboard characters (y) (upper/lower case sensitive), minimum 6[...]

140 MultiModemBL User Guide Appendix E - DIP-Switch Summary Asynchronous Mode DIP-Switch Condition Effect #1 UP* DTR dependent on interface Down DTR forced On at all times #2 UP* Hardware Flow Control Down Xon/Xoff Flow Control #3** 2834 Series: UP -15 dB Transmission (leased line) Down* -9 dB Transmission (leased line) #3** 1932 and 1432 Series: U[...]

141 Appendix E - DIP-Switch Summary Synchronous Mode DIP-Switch Condition Effect #1 UP* DTR Dependent On interface Down DTR forced On at all times #2 UP* SDLC Mode On Down BSC Mode On #3 UP Command Mode Response Off Down * Command Mode Response On #4 UP* AS/400 Mode Off Down AS/400 Mode On #5 UP* Answer Mode On Down Originate Mode On #6 UP* Slave C[...]

142 MultiModemBL User Guide DIP Switches #13-14 Note: The modem baud rate command ( $MBn ) overrides the setting of these speed selection switches (DIP switches #13 and #14). 2834 Series: SWITCH CONDITION EFFECT #13/#14 UP/UP* 28.8 K bps Operation #13/#14 DOWN/UP 19.2 K bps Operation #13/#14 UP/DOWN 14.4 K bps Operation #13/#14 DOWN/DOWN 9600 bps O[...]

143 Appendix F - S-Register Summary Appendix F - S-Register Summary S-REGISTER UNIT RANGE DEFAULT DESCRIPTION S 0 1 ring 0 -25 5 1 Sets number of rings before modem answers. S 1 1 ring 0-255 0 Counts rings which have occurred. S 2 ASCII 0-127 43 Sets Escape Code character (default is plus + sign). S 3 ASCII 0-127 13 Sets character recognized as RET[...]

144 MultiModemBL User Guide S-REGISTER UNIT RANGE DEFAULT DESCRIPTION S 24 50 mSec 0-255 20 Sets DSR/CTS/CD dropout time. Default (20) equals one second. S 25 100 mSec 0-255 0 Sets DTR dropout time. 0 default equals 50 mSec. S 26 1 0-255 0 Specifies number of failed password attempts allowed. S 29 1 1-255 20 Specifies the amount of idle time can el[...]

145 Appendix G - Result Code Summary Appendix G - Result Code Summary TERSE (Digit) VERBOSE (Words) Effect 0 OK Command was executed without error; ready for next command. 1 CONNECT Modem has detected carrier and gone on-line. 2 RING Modem has detected ring caused by incoming call. 3 NO CARRIER No carrier signal has been detected within allowed tim[...]

146 MultiModemBL User Guide Note: If the modem is used in MNP Reliable mode, the following responses change: 1R CONNECT RELIABLE 5R CONNECT 1200 RELIABLE 9R CONNECT 2400 RELIABLE 11R CONNECT 4800 RELIABLE 12R CONNECT 9600 RELIABLE 13R CONNECT 14400 RELIABLE 19R** CONNECT 19200 RELIABLE 21R* CONNECT 21600 RELIABLE 24R* CONNECT 24000 RELIABLE 26R* CO[...]

147 Appendix H - V.25bis Operation Appendix H - V .25bis Operation Chapter 5 described a set of commands which let the modem dial, hang-up, and be configured for various applications. However, these commands, the AT command set, are only functional when the DTE transmits data asynchronously. That is, they cannot be used with synchronous equipment s[...]

148 MultiModemBL User Guide Another asynchronous mode concern is the problem of connecting at a different speed than the speed at which the serial port is set. If your modem port speed is different from the serial port speed, you must either: 1) Enable speed conversion and have flow control on, or 2) Enable connect responses (with the ATX1 command)[...]

149 Appendix H - V.25bis Operation V.25bis Mode AT Commands The following commands will either alter standard V.25 bis behavior (so you must be careful in their use) or they are not allowed, as indicated. All other commands can be used in V.25 bis operation. A Not Allowed A/ Not Allowed A: Not Allowed D Not Allowed D...N Not Allowed $D Alters Opera[...]

150 MultiModemBL User Guide V.25bis AT Commands The AT commands associated with V.25 bis mode are described as follows. Note that one command enables and disables V.25 bis mode and the rest are only operable in the V.25 bis mode. Enable/Disable V.25bis Mode ($V) Command The function of the $V command is to select the V.25 bis mode in asynchronous m[...]

151 Appendix H - V.25bis Operation Listing Delayed Phone Numbers (RLD) Command When a phone number is dialed by a CRN command and a connection is not made, the number is entered in the modem's V.25 bis Delayed Number list along with the number of retry attempts. Any further dialing attempts will be delayed some amount of time (determined by th[...]

152 MultiModemBL User Guide ITU V.25bis Country Specific Information Due to the flexibility of the V.25 bis standard, each country may establish specific regulations governing the way operations are handled. The purpose of this document is to detail each country's specific regulations that affect operation of V.25 bis in Multi-Tech modems. 1. [...]

153 Appendix H - V.25bis Operation 4. France a) Command/Indication modification (none) b) Delay and Forbidden list behavior 1. 2 min. delay after 1st call, 4 after 2nd, 6 after 3rd, etc. 2. After 5 retries, the number is put on the forbidden list 3. The number remains on the forbidden list forever 4. Delayed and Forbidden Numbers lists are checked [...]

154 MultiModemBL User Guide Appendix I - MultiModemBL Cables These cables connect your modem to your terminal or computer’s serial port. 25-PIN DTE Connector 25-PIN DCE Device 2T D 3R D 4R T S 5 CTS 6 DSR 7G N D 8C D 20 DTR 22 RI TD 2 RD 3 RTS 4 CTS 5 DSR 6 GND 7 CD 8 DTR 20 RI 22 Figure I-1. RS232 Cable (IBM PC) RJ-1 1 T ype Modular Plug T o T e[...]

155 Appendix J - RS-232C Interface Specifications 25 POS MALE DSUB 8 POS. MINI-DIN TD 2 RCV 3 RTS 4 CTS 5 GND 7 1 Handshake Out 2 Handshake In 4G N D 8G N D 3T D 5 RCV 876 54 3 21 8 POS. MINI-DIN FEMALE Figure I-4. MAC Cable[...]

156 MultiModemBL User Guide Appendix J - RS-232C Interface Specifications The modem's RS-232C interface circuits have been designed to meet the electrical specifications given in EIA (Electronic Industries Association) RS-232C standards. All signals generated by the modem are approximately 10 volts when measured across a load of 3000 ohms or g[...]

157 Appendix J - RS-232C Interface Specifications Functional Description of RS-232C Signals: Transmitted Data - Pin 2, SD (BA) Direction: to modem Signals on this circuit are generated by the customer's terminal and transferred to the transmitter of the modem. A positive signal is a space (binary 0) and a negative signal is a mark (binary 1). [...]

158 MultiModemBL User Guide Test Voltage - Pin 9, XV Direction: from modem The XV lead has 330 ohms of resistance to +12 volts DC. This lead may be used to strap other signals high. For example, if the terminal does not supply a DTR (Data Terminal Ready) signal, Pin 9 may be jumpered to Pin 20 (DTR) on the RS-232 connector or in the cable to force [...]

159 Appendix J - RS-232C Interface Specifications External Transmit Clock - Pin 24, XTC Direction: to modem Supplies the same function as transmit clock on Pin 15. Terminal Busy (Out of Service) - Pin 25, OOS Direction: to modem The Terminal Busy (OOS) circuit is not defined in the RS-232C standard, but is used by us and most manufacturers to make [...]

160 MultiModemBL User Guide Appendix K - Regulatory Information Compliance with BABT Requirements Approved for connection to telecommunications system specified in the instructions for use subject to the conditions set out in them. Warning: Interconnection directly, or by way of other apparatus, of ports marked "SAFETY WARNING see instructions[...]

161 Appendix K - Regulatory Information All other apparatus connected to this modem and thereby connected directly or indirectly to the British Telecom public switched telephone network must be approved apparatus as defined in Section 22 of the British Telecommunications Act 1984. The Approval Label is as follows: APPROVED for connection to telecom[...]

162 MultiModemBL User Guide International Modem Restrictions Some dialing and answering defaults and restrictions may vary for international modems. Changing settings may cause a modem to become non-compliant with national telecom requirements in specific countries. Also note that some software packages may have features or lack restrictions that m[...]

163 Appendix K - Regulatory Information FCC Regulations for Telephone Line Interconnection 1. This equipment complies with Part 68 of the Federal Communications Commission (FCC) rules. On the outside surface of this equipment is a label that contains, among other information, the FCC registration number and ringer equivalence number (REN). If reque[...]

164 MultiModemBL User Guide Canadian Limitations Notice Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface. The termination of a interface may consist of any combination of devices subject only to the requirement that[...]

165 Index Index Symbols &E0 .................................................................... 32 &E1 .................................................................... 32 &E14 .................................................................. 32 &T command .................................................... 101 16550 UAR T and[...]

166 MultiModemBL User Guide Diagnostics ......................................................... 15 Dial (D) ............................................................... 49 Dial Phone Number Provided (CRN) Command150 Dial Pulse and T one-Dial Frequencies ............. 130 Dialing a Stored Number (N) .............................. 49 Dialing/On-[...]

167 Index M MAC Cable ....................................................... 155 Macintosh computer .................................... 28, 31 Maximum Throughput Setting .......................... 1 1 1 Memory Nonvolatile (NVRAM) ..................................... 30 MNP 5 ....................................................... 32, 127 Model N[...]

168 MultiModemBL User Guide Speed Conversion ($BA) ................................... 70 Speed Switches ............................................... 1 13 Storing Phone Numbers (D...N) ......................... 53 Summary ............................................................ 86 Synchronous T ransmit Clock Select (&X) .......... 55 T T[...]