Multi-Tech Systems MT5600DSVD manuale d’uso

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ii MT5600DSVD User Guide Model MT5600DSVD P/N S0000169 Revision B Copyright © 1998–2001 by Multi-Tech Systems, Inc. All rights reserved. This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-Tech Systems, Inc. Multi-Tech Systems, Inc. makes no representations or warranties with respect[...]

MultiModemDSVD User Guide iii Contents Chapter 1: Introduction Introduction ................................................................................................................... .......... 2 Product Description ............................................................................................................ .... 2 Features [...]

Contents iv MultiModemDSVD User Guide Chapter 4: A T Commands, S-Registers & Result Codes AT Commands .................................................................................................................... .. 23 AT Command Summary ..................................................................................................... [...]

Contents v MultiModemDSVD User Guide Appendix E: Upgrading the Modem Introduction ................................................................................................................... ........ 71 Upgrade Overview ............................................................................................................... 71 Step 1: [...]

1 Introduction[...]

MultiModemDSVD User Guide 1 Introduction 2 Introduction Congratulations on your purchase of your MultiModemDSVD! You have acquired not only one of the finest intelligent data, fax, and voice modems available, but a modem that can transmit voice and data at the same time. This user guide will help you to install, configure, test, and use your modem.[...]

MultiModemDSVD User Guide 1 Introduction 3 Data • Supports the ITU-T V.90 and K56flex TM standards for data transmission speeds up to 56K bps while maintaining compatibility with lower-speed modems. Note: Under the 56K bps standards, you can asymmetrically download data from an ISP at speeds up to 53K bps, whereas you can upload only at speeds up[...]

MultiModemDSVD User Guide 1 Introduction 4 What Is in Y our Modem Package? Your modem package has several components. Make sure you have them all before trying to operate your modem. Your package should include: • One MT5600DSVD modem • One DC power supply • One set of four plastic feet • One modular telephone cable • One headset • A pr[...]

2 Installation[...]

MultiModemDSVD User Guide 2 Installation 6 Introduction This chapter shows step-by-step how to set up your MultiModemDSVD and con- figure your communications software to work with it. What Y ou Will Need Before starting, please make sure you have everything you need: W e supply An MT5600DSVD data/fax/voice modem A DC power supply module A set of fo[...]

MultiModemDSVD User Guide 2 Installation 7 Step 1: Mount the Feet The modem comes with a strip of self-adhesive plastic feet, which you can optional- ly mount on the bottom of the modem. To install the feet, simply peel them from their paper strip and press them into the recesses on the bottom of the modem. Figure 2-1. Mounting the feet. Step 2: Ch[...]

MultiModemDSVD User Guide 2 Installation 8 J10 J10 Speaker Mode Closed: stereo (default) Open: mono Figure 2-2. Location of speaker jumper. Changing the Speaker Jumper The speaker jumper (J10) is behind the internal speaker near the external speaker jack (see Figure 2-2). • To use the MultiModemDSVD with a monophonic external speaker, remove the [...]

MultiModemDSVD User Guide 2 Installation 9 Step 3: Connect the Modem to Y our System Placing the modem in a convenient location, connect it to your com puter ’ s serial port, to the telephone line, to AC power, and, optionally, to your telephone. For voice operations, connect it to the supplied headset or, optionally, to a microphone and a speake[...]

MultiModemDSVD User Guide 2 Installation 10 Note: The Federal Communications Commission (FCC), Industry Canada, and other government agencies may impose certain restrictions on equipment connected to public telephone systems. For more in fo rm ati on , see Appendix A. Phone Connection For voice-only calls, you can optionally plug a telephone into t[...]

MultiModemDSVD User Guide 2 Installation 11 Step 4: Install the Modem Driver If you use Windows 95, Windows 98, Windows Me, Windows NT 4.0, or Windows 2000, you must install the modem driver. (If you use Windows 3.1 or another operating system, skip this step and go to Step 5.) The modem driver is used by Windows to con- trol the modem. Installing [...]

MultiModemDSVD User Guide 2 Installation 12 Step 5: Install and Configure Y our Software You may use either the communication program included with your modem or a third-party program. Communication programs designed for Windows 95/98/Me and Windows NT/2000 normally do not need to be manually configured, since they use the Plug and Play configurati[...]

3 Operation[...]

MultiModemDSVD User Guide 3 Operation 14 Introduction Like any modem, your MultiModemDSVD operates only under the control of a communication program, such as the one included with the modem. It also operates under other general-purpose data communication programs, such as Windows Ter- minal and HyperTerminal. For information on how to use the modem[...]

MultiModemDSVD User Guide 3 Operation 15 OH Off-Hook. The OH LED lights when the modem is off-hook, which occurs when the modem is dialing, online, or answering a call. The LED flashes when the modem pulse-dials. TR Terminal Ready. The TR LED lights when a datacomm program initializes the modem. It means the modem is ready for an outgoing or incomi[...]

MultiModemDSVD User Guide 3 Operation 16 • POP server address • Mail or SMTP address • News or NNT server address Dial-Up Networking Whether you use the Internet for e-mail or for browsing the Web, to connect to it through your modem, you must first set up a remote-node client program. The one in Windows 95, 98, Me, NT 4.0, and 2000 is called[...]

MultiModemDSVD User Guide 3 Operation 17 6. Follow the instructions provided by your ISP for browsing the the Internet, reading e-mail, and accessing information. For further information on Dial-Up Networking or Microsoft Client for NetWare Networks, see Windows Help. Dial-Up Networking in Windows Me To install Dial-Up Networking Dial-Up Networking[...]

MultiModemDSVD User Guide 3 Operation 18 10. Click Continue , and then click Restart to finish the installation. 11. When the installation is complete, reboot the computer. To create a connection entry 1. Double-click the My Computer icon, and then double-click the Dial-Up Net- working icon . 2. In the Dial-Up Networking dialog box, click the New b[...]

MultiModemDSVD User Guide 3 Operation 19 Fax Operation Using the PhoneTools program included with your modem, you can use your modem to send and receive faxes directly from your computer. The following procedure uses print capture, which enables you to fax a document directly from the Windows ap- plication in which you created it without opening Ph[...]

MultiModemDSVD User Guide 3 Operation 20 T o Answer a V oice Call in Speakerphone Mode 1. In the terminal window of your communications application, type AT and press E NTER . The modem will respond with OK . 2. Type AT&F and press E NTER to reset the modem to its default configuration. 3. Type AT#CLS=8#VRN=0#VLS=6S0=0 and press E NTER to initi[...]

MultiModemDSVD User Guide 3 Operation 21 5. You will hear some high pitched tones, then a static-like sound after the remote modem picks up your call. You will see a CONNECT response on your terminal. You can then send data to the remote modem and talk to the remote user by speaking into the microphone 6. To hang up, type +++ATH and press E NTER . [...]

4 A T Commands, S-Registers & Result Codes[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 23 A T Commands AT commands are used to control the operation of your modem. They are so called because each command must be preceded by the characters AT to get the AT tention of the modem. AT commands can be issued only when the modem is in command mode or online command mode[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 24 A T Command Summary Command: AT Attention Code Values: n/a Description: The attention code precedes all command lines except A/ and the escape sequence. Command: E NTER Key Values: n/a Description: Press the E NTER or R ETURN key to execute most commands. Command: A Answer V[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 25 ; Return to command mode after dialing. (Place at end of dial string.) ! Hook flash. Causes the modem to go on-hook for the time specified in S29 , then off-hook again . @ Wait for silence. Causes the modem to wait for 5 seconds of silence before processing the next part of [...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 26 Command: L n Monitor Speaker Volume Values: n = 0, 1, 2, or 3 Default: 1 Description: L0 Select low volume. L1 Select low volume. L2 Select medium volume. L3 Select high volume. Note: Use the M command to turn the speaker on or off. Command: L5 Display Legacy Parameters Valu[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 27 Command: O n Return Online to Data Mode Values: 0 or 1 Default: None Description: O0 Exit online command mode and return to online data mode without a retrain. Normally used after a +++ escape (see +++AT<CR> escape sequence). O1 Exit online command mode and return to o[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 28 Command: W n Connect Message Control Values: n = 0, 1, or 2 Default: 0 Description: W0 The CONNECT result code reports the serial port speed only. W1 The CONNECT result code reports the line speed, the error correction protocol, and the serial port speed, respectively. W2 Th[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 29 Command: &C n Data Carrier Detect (DCD) Control Values: n = 0 or 1 Default: 1 Description: &C0 Forces the DCD circuit to always be high. &C1 DCD goes high when the remote modem ’ s carrier signal is de- tected, and goes low when the carrier signal is not detect[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 30 Command: &E n V.42bis Data Compression Values: n = 14 or 15 Default: 15 Description: &E14 V.42bis data compression disabled. &E15 V.42bis data compression enabled. Note: This command controls only V.42bis data compression, whereas the %C command controls both V.4[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 31 Command: &M n Communications Mode Values: n = 0 Default: 0 Description: This command determines the DTR operating mode. The mo- dem treats the & M command as a subset of the & Q command. &M0 Selects direct asynchronous operation. Note that the command sequenc[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 32 &T3 Start local digital loopback, V.54 Loop 2. If no connection ex- ists, ERROR is returned. &T4 Enables acknowledgment for remote digital loopback request. &T5 Ignores acknowledgment for remote digital loopback request. &T6 Requests a remote digital loopback[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 33 Command: &Zy =x Store Telephone Number Values: y = 0 – 3 x = Dialing command Default: None Description: Stores telephone dial string x in memory location y . Each tele- phone number dial string can contain up to 34 digits. Dial the stored number using the command ATDS=[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 34 Command: %U PCM Code Selection Values: n = 0 or 1 Default: 0 Description: Specifies the PCM code type for 56K modulation. Note, how- ever, that the modem automatically selects the code type if the server sends the proper ID. %U0 Selects µ-Law coding — used in North Americ[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 35 Online command mode. The modem receives a Bn command from the computer: K0 Clear data buffers and send break to the remote modem. K1 Same as K0 . K2 Send break immediately to the remote modem. K3 Same as K2 . K4 Send break to the remote modem in sequence with the tra[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 36 Command: +MS= Modulation Selection Values: See description. Default: See description. Description: This extended-format command selects modulation and, op- tionally, enables or disables automode, specifies the lowest and highest connection rates, selects µ-Law or A-Law code[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 37 <mod> 0 1 2 3 9 10 11 12 2 56 3 64 69 Modulation V. 2 1 V. 2 2 V .22bis V. 2 3 V. 3 2 V .32bis V. 3 4 V. 9 0 K56flex Bell 103 Bell212 Possible rates (bps) 1 300 1200 2400 or 1200 1200 9600 or 4800 14400, 12000, 9600, 7200, or 4800 33600, 31200, 28800, 26400, 24000, 216[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 38 Command: -SDR= n Distinctive Ring Control Values: 0 – 7 Default: 0 Description: This command enables or disables detection and reporting of distinctive ring. One, two, or three distinctive ring types can be simultaneously enabled depending upon the value of n. The detected[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 39 Command: $SB n Serial Port Baud Rate Values: n = speed in bits per second Default: 57600 Description: $SB300 Set serial port to 300 bps. $SB1200 Set serial port to 1200 bps. $SB2400 Set serial port to 2400 bps. $SB4800 Set serial port to 4800 bps. $SB9600 Set serial port to [...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 40 Command: -SSE= n DSVD Enable/Disable Values: n = 0 or 1 Default: 0 Description: -SSE=0 Disable DSVD. -SSE=1 Enable DSVD. Note: DSVD mode can be enabled by either the -SSE=1 or the -SMS=1 command, and disabled by either -SSE=0 or -SMS=0 . Command: #BDR =n Baud Rate Select Val[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 41 S-Registers Certain modem values, or parameters, are stored in memory locations called S- registers. Use the S command to read or to alter the contents of S-registers (see previous section). Register Unit Range Default Description S0 1 ring 0, 1 – 255 1 Sets the number of [...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 42 S18 seconds 0 – 255 0 Sets the length of time that the modem con- ducts an & T test before it returns to the command mode. If the value is zero, the test must be terminated from command mode by issuing an & T0 or H command. When S18 is non-zero, the modem returns t[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 43 6 Reserved. 7 An MNP connection is attempted and if it fails, a normal modem connection is established. S37 decimal 0 0 Sets the maximum V.34 speed at which the modem attempts to connect. The default value is an automode connection. If N0 is active, connection is attempted a[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 44 S86 decimal 0, 3 – 23 n/a When the modem issues a NO CARRIER result code, a value is written to this register to help determine the reason for the failed connection. S86 records the first event that contributes to a NO CARRIER message. Use the S86? command to read the valu[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 45 Result Codes In command mode your modem can send the following responses, called result codes , to your computer. Result codes are used by communications programs and can also appear on your monitor. Terse Verbose Description 0O K Command executed 1 CONNECT Modem connected t[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 46 62 CONNECT 24000 Connected at 24000 bps 63 CONNECT 26400 Connected at 26400 bps 64 CONNECT 28800 Connected at 28800 bps 66 COMPRESSION CLASS 5 Connected with MNP Class 5 data compression 67 COMPRESSION V.42 bis Connected with V.42 bis data compression 69 COMPRESSION NONE Con[...]

MultiModemDSVD User Guide 4 A T Commands, S-Registers, and Result Codes 47 185 CONNECT 37333 Connected at 37333 bps (V.90 mode) 185 CARRIER 37333 37333 bps data carrier detected (V.90 mode) 186 CONNECT 38667 Connected at 38667 bps (V.90 mode) 186 CARRIER 38667 38667 bps data carrier detected (V.90 mode) 187 CONNECT 41333 Connected at 41333 bps (V.9[...]

5 Solving Problems[...]

MultiModemDSVD User Guide 5 Solving Problems 49 Introduction 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. How- ever, it is more likely that the source o[...]

MultiModemDSVD User Guide 5 Solving Problems 50 The Modem Does Not Respond to Commands Make sure the modem is plugged in and turned on. (See “ None of the Indicators Light. ” ) Make sure you are issuing the modem commands from the data communications software, either manually in terminal mode or automatically by configuring the software. (You c[...]

MultiModemDSVD User Guide 5 Solving Problems 51 Windows 9x: Right-click on My Computer, select Properties from the menu, click on the Device Manager tab, double-click on Ports , then double-click on the communication port your modem is connected to. In the port ’ s Properties sheet, click on the Resources tab to see the port ’ s input/output ra[...]

MultiModemDSVD User Guide 5 Solving Problems 52 string to replace X4 with X3 , which will cause the modem to ignore dial tones (note, however, that X3 is not allowed in some countries, such as France and Spain). If the modem reports BUSY, the other number might be busy, in which case you should try again later, or it might indicate that you have fa[...]

MultiModemDSVD User Guide 5 Solving Problems 53 If you were online with a BBS or an online service like CompuServe, it might have hung up on you because of lack of activity on your part or because you ex- ceeded your time limit for the day. Try again. The Modem Cannot Connect When Answering Autoanswer might be disabled. Turn on autoanswer in your d[...]

MultiModemDSVD User Guide 5 Solving Problems 54 Make sure the flow control method you selected in software matches the method selected in the modem. If you are using the modem with a Macintosh, you might have the wrong cable for hardware flow control. If you are running under Windows 3.1 and have a 16550AFN UART, you might need to turn on the 16550[...]

Appendixes[...]

MultiModemDSVD User Guide A Regulatory Compliance 56 Appendix A: Regulatory Compliance FCC Part 68 T elecom 1. This equipment complies with part 68 of the Federal Communications Commis- sion Rules. On the outside surface of this equipment is a label that contains, among other information, the FCC registration number. This information must be provid[...]

MultiModemDSVD User Guide A Regulatory Compliance 57 Manufacturer: Multi-Tech Systems, Inc. Model Number: MT5600DSVD FCC Registration No: AU7USA-24713-M5-E Ringer Equivalence: 0.3B Modular Jack (USOC): RJ11C or RJ11W (single line) Service Center in USA: Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, MN 55112 U.S.A. (763) 785-3500 (763) 78[...]

MultiModemDSVD User Guide A Regulatory Compliance 58 Fax Branding Statement The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to use a computer or other electronic device, including fax machines, to send any mes- sage unless such message clearly contains the following information: • Date and time the message is sent ?[...]

MultiModemDSVD User Guide A Regulatory Compliance 59 EMC, Safety , and R&TTE Directive Compliance The CE mark is affixed to this product to confirm compliance with the following European Community Directives: • Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of Member States relating to electromagnetic compatibilit[...]

MultiModemDSVD User Guide A Regulatory Compliance 60 4. This device is equipped with pulse dialing, while the Telecom standard is DTMF tone dialing. There is no guarantee that Telecom lines will always continue to support pulse dialing. Use of pulse dialing, when this equipment is connected to the same line as other equipment, may give rise to ‘ [...]

MultiModemDSVD User Guide B Technical Specifications 61 Appendix B: T echnical Specifications Your MultiModemDSVD modem meets the following specifications: Trade Name MultiModemDSVD ™ Model Number MT5600DSVD Server-to-Client K56flex or V.90 speeds when accessing an ISP type K56flex Data Rates or V.90 server (actual speed depends on server capabil[...]

MultiModemDSVD User Guide B Technical Specifications 62 Data Modulation FSK at 300 bps, PSK at 1200 bps, QAM at 2400, 4800, and 9600 bps (non-trellis), QAM with trellis-coded modulation (TCM) at 9600, 12,000, 14,400, 16,800, 19,200, 21,600, 24,000, 26,400, 28,800, 31,200, 33,600, and 56,000 bps Fax Modulation V.21 CH2 FSK at 300 bps (half duplex) V[...]

MultiModemDSVD User Guide B Technical Specifications 63 Voice Compression PCM 128, 8000 Hz, or IMA ADPCM, 8000 Hz, (selectable and Sampling Rate via #V commands). Note that your computer system should have a processing speed of at least 75 MHz to take full ad- vantage of the telephony features of this product. Transmit Level -11 dBm (dial-up) Frequ[...]

MultiModemDSVD User Guide C Loopback Tests 64 Appendix C: Loopback T ests Introduction Each time you turn on your modem, it performs an automatic self-test to ensure proper operation. Your modem also has three diagnostic tests: local analog loop- back, remote digital loopback, and local digital loopback. These ITU-T V.54 loop- back tests isolate te[...]

MultiModemDSVD User Guide C Loopback Tests 65 3. Type AT&T1 and press E NTER . This places your modem in analog loopback mode in the originate mode. A CONNECT message should appear on your dis- play. The modem is now out of command mode and in a pseudo-online mode. 4. Note that the CD LED is on. If you are set for 14,400 bps or higher, a speed [...]

MultiModemDSVD User Guide C Loopback Tests 66 3. Dial the remote modem and establish your online connection. 4. Type the escape sequence +++AT and press E NTER to bring your modem into online command mode. 5. Type AT&T6 and press E NTER . The local modem responds to this command by transmitting an unscrambled marking signal, which causes the re[...]

MultiModemDSVD User Guide C Loopback Tests 67 3. Type the escape sequence +++AT and press E NTER to bring your modem into online command mode. 4. Type AT&T3 and press E NTER . Once you receive an OK message from your mo- dem (if responses are enabled), your modem is placed in digital loopback mode. 5. Have someone enter data from the remote key[...]

MultiModemDSVD User Guide D Warranty, Service, and Technical Support 68 Appendix D: W arranty , Service, and T echnical Support Limited W arranty Multi-Tech Systems, Inc. (MTS) warrants that this product will be free from defects in material or workmanship for a period of five years from the date of purchase or, if date of purchase is not provided,[...]

MultiModemDSVD User Guide D Warranty, Service, and Technical Support 69 A Returned Materials Authorization (RMA) is not required. Return shipping charg- es (surface) will be paid by MTS. Please include inside the shipping box a description of the problem, a return shipping address (must have street address, not P.O. Box), a telephone number, and if[...]

MultiModemDSVD User Guide D Warranty, Service, and Technical Support 70 Internet Sites Multi-Tech maintains a Web site at http://www.multitech.com and an ftp site at ftp://ftp.multitech.com Ordering Accessories SupplyNet, Inc., can supply you with replacement power supplies, cables and con- nectors for select Multi-Tech products. You can place an o[...]

MultiModemDSVD User Guide E Upgrading the Modem 71 Appendix E: Upgrading the Modem Introduction Your modem is controlled by semi-permanent software, called firmware , which is stored in flash memory. Firmware is nonvolatile; that is, it remains stored in memory when the modem is turned off. However, it can be changed by either the manufac- turer or[...]

MultiModemDSVD User Guide E Upgrading the Modem 72 Step 2: Identify the Current Firmware V ersion Identify the current version of the firmware at the Multi-Tech Web site. If your modem already has the current firmware, there is no need to update it. 1. Using your favorite Web browser, go to http://www.multitech.com/SUP- PORT/MultiModemDSVD/firmware[...]

MultiModemDSVD User Guide E Upgrading the Modem 73 2. In the program ’ s terminal window, type AT&V and press E NTER to list your modem ’ s current parameters. 3. Record your parameters by saving the screens and sending them to your printer. 4. Type AT&F and press E NTER to clear your stored parameters and reset your mo- dem to factory [...]

Index[...]

MultiModemDSVD User Guide Index 75 A abort timer , 41 analog loopback test, 64 Answer command, 24 answering machine capabilities, 3 assembling the modem, 7 Asynchronous Communications Mode command, 31 A T commands, 3, 23 – 39 #BDR=, 40 #CID=, 38 #CLS=, 40 #MDL?, 40 #MFR?, 40 #REV?, 40 #VLS=, 40 $SB, 39 %C, 33 %E, 33 %L, 33 %Q, 33 %U, 34, 37 &[...]

MultiModemDSVD User Guide Index 76 error contr ol, setting, 43 error corr ection, 3 disabling, 64, 65, 66 Error Correction Mode Selection command, 35 escape character , 41 escape sequence, 23, 39 escape sequence guard time (S12), 41 F fallback, 26 fax, 3 fax communications, 19 fa xin g f ro m a W indows program, 19 FCC regulations, 56 – 57 firmwa[...]

MultiModemDSVD User Guide Index 77 Store Curr ent Configuration command, 12, 32 Store T elephone Number com- mand, 33 surge pr otector , 10 T technical specifications, 61 – 63 telephone connecting a, 10 line, 51 number , storing, 33 T elephone Jack Contr ol com- mand, 30 terminal mode, 50, 65 test timer (S18), 42 testing the modem, 10, 31, 51 fax[...]