Multi-Tech Systems MT5634ZPX-PCI-V92 инструкция обслуживания

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ii MultiModemZPX User Guide MT5634ZPX-PCI-V92 P/N S0000197 Revision A Copyright © 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 to[...]

Contents iii MultiModemZPX User Guide Chapter 1: Introduction Introduction ................................................................................................................... .......... 2 Product Description ............................................................................................................ .... 2 What Is in[...]

Contents iv MultiModemZPX User Guide Chapter 6: Solving Problems Introduction ................................................................................................................... ........ 49 The Modem Does Not Respond to Commands ............................................................... 49 The Modem Cannot Connect When Dialing [...]

Contents v MultiModemZPX User Guide Appendix E: Upgrading the Modem Introduction ................................................................................................................... ........ 70 Upgrade Overview ............................................................................................................... 70 Step 1: I[...]

1 Introduction[...]

1 Introduction 2 MultiModemZPX User Guide Introduction Congratulations on your purchase of the MultiModemZPX. You have acquired one of the finest internal V.92 data/fax/voice modems available today from one of the world ’ s oldest modem manufacturers: Multitech Systems, Inc. This user guide will help you to install, configure, test, and use your [...]

2 Installation[...]

2 Installation 4 MultiModemZPX User Guide Introduction This chapter shows you step-by-step how to set up your MultiModemZPX data/fax/ voice modem and make your first calls. What Y ou Will Need Before starting, please make sure you have everything you need: W e supply An MT5634ZPX-PCI-V92 data/fax/voice modem An RJ-11 telephone cable A printed Quick[...]

2 Installation 5 MultiModemZPX User Guide Step 1: Install the MultiModemZPX in your Computer Figure 2-1. The MultiModemZPX. Installing the MultiModemZPX requires you to open your computer. Please consult your computer manual in addition to the following instructions. 1. Turn off the computer and unplug it. Failure to do so may result in damage to b[...]

2 Installation 6 MultiModemZPX User Guide Step 2: Make the External Connections Now connect the MultiModemZPX to the telephone line and, optionally, to your telephone. For voice mail or speakerphone use, you can also connect it to a micro- phone and an external speaker, headphone, or sound card. The microphone can be used for recording answering ma[...]

2 Installation 7 MultiModemZPX User Guide Microphone Connection For voice mail or speakerphone applications, plug an unamplified microphone into the MIC jack. The microphone should have a stereo 3.58mm (9/64-inch) mini plug. Do not use a monophonic microphone. Sound Card and Speaker Connections For voice mail or speakerphone applications, use a 3.5[...]

2 Installation 8 MultiModemZPX User Guide Step 3: Install the Modem Driver If you use Windows 95 or newer, you must install the modem driver. The modem driver tells Windows how to control the modem. If you use a Linux operating sys- tem, please see Appendix F for installation instructions. If you use the SCO OpenS- erver operating system, please se[...]

2 Installation 9 MultiModemZPX User Guide 8. When the Add New Hardware wizard says it will search for new drivers for the Wave device for the voice modem, click Next . 9. Select Search for the best driver for your device , and then click Next . 10. Select CD-ROM drive , and then click Next . 11. When Windows says it has found the driver for the voi[...]

2 Installation 10 MultiModemZPX User Guide Verifying the Windows 95/98/Me Configuration Windows assigns an interrupt request (IRQ) number for your modem. Because the number of IRQs is limited, a computer with several accessories may not have an available IRQ for your new modem. In that case, you may have to decide which of your other accessories yo[...]

2 Installation 11 MultiModemZPX User Guide Windows NT 4.0 Before you begin a Windows NT installation, make sure Wi ndows NT Service Pack 3 or newer is installed on the computer. Also, to add and remove devices you must be logged on with Administrator privileges. 1. After installing the MultiModemZPX modem into your computer, turn the com- puter on [...]

2 Installation 12 MultiModemZPX User Guide 6. In the Configure Port Usage dialog box, select Dial out only , Receive calls only , or Dial out and receive calls , depending upon how the phone line will be used. Click OK . 7. In the Remote Access Setup dialog box, click Network . 8. In the Network Configuration dialog box, make sure that only TCP/IP [...]

2 Installation 13 MultiModemZPX User Guide Verifying the Windows NT Configuration To verify your modem configuration in Windows NT: 1. Click Start | Settings | Control Panel . Double-click Modems . 2. The Modem Properties dialog box appears, showing the COM port associated with the modem. 3. Click Properties . View the General tab to display inform[...]

2 Installation 14 MultiModemZPX User Guide 3. In the Modem tab, select Multi-Tech Systems MT5634ZPX-PCI-V92, and then click the Properties button to display information about your modem settings. • Extra AT commands (see Chapter 4) may be entered in the Extra initializa- tion commands field. • To change port assignments, click Advanced Port Set[...]

2 Installation 15 MultiModemZPX User Guide Step 4: Configure the Modem f or Y our Country Before you use your modem, you must configure it for the country in which it will be used. You must also do this if you move the modem to another country after it has been configured for the first country. You can use one of two configuration methods: the Glob[...]

2 Installation 16 MultiModemZPX User Guide 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 and above normally do not need to be manually configured, since they obtain configura- tion information from Windows. C[...]

3 Operation[...]

3 Operation 18 MultiModemZPX User Guide Introduction Your Multi-Tech modem operates under the control of a communication pro- gram, such as the PhoneTools program included with the m odem. It also can op- erate under other general-purpose data communication programs, such as Windows HyperTerminal. For information on how to use the modem with the co[...]

3 Operation 19 MultiModemZPX User Guide E-mail or POP mail address POP server address Mail or SMTP address News or NNT server address Dial-Up Networking Before you can connect to the Internet, you must set up a remote-node client pro- gram. The Windows version is called Dial-Up Networking. Dial-Up Networking es- tablishes your connection to the ISP[...]

3 Operation 20 MultiModemZPX User Guide References The World Wide Web is an excellent source of information about modems in general and modem installation, configuration, and troubleshooting in particular. The following Web sites are good places to start: Costmo ’ s Other Resources Page: http://modems.rosenet.net/ Data Communications FAQ: http://[...]

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

4 AT Commands, S-Registers, and Result Codes 22 MultiModemZPX User Guide Introduction 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. [...]

4 AT Commands, S-Registers, and Result Codes 23 MultiModemZPX User Guide A T Commands 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. This action is frequently ab[...]

4 AT Commands, S-Registers, and Result Codes 24 MultiModemZPX User Guide @ Wait for quiet answer. Causes modem to wait for a ring back, then 5 seconds of silence, before processing next part of command. If silence is not detected, the modem returns a NO ANSWER code. ^ Disable data calling tone transmission. $ Detect AT&T call card “ bong ” [...]

4 AT Commands, S-Registers, and Result Codes 25 MultiModemZPX User Guide Command: M n Monitor Speaker Mode Values: n = 0, 1, 2, or 3 Default: 1 Description: M0 Speaker always off. M1 Speaker on until carrier signal detected. M2 Speaker always on when modem is off-hook. M3 Speaker on until carrier is detected, except while dialing. Command: N n Modu[...]

4 AT Commands, S-Registers, and Result Codes 26 MultiModemZPX User Guide Command: T Tone Dialing Values: P, T Default: T Description: Configures the modem for DTMF (touch-tone) dialing. Dialed digits are tone dialed until a P command or dial modifier is received. Command: V n Result Code Format Values: n = 0 or 1 Default: 1 Description: V0 Displays[...]

4 AT Commands, S-Registers, and Result Codes 27 MultiModemZPX User Guide Command: &D n Data Terminal Ready (DTR) Control Values: n = 0, 1, 2, or 3 Default: 2 Description: &D0 Modem ignores the true status of the DTR signal and responds as if it is always on. &D1 If DTR drops while in online data mode, the modem enters command mode, issu[...]

4 AT Commands, S-Registers, and Result Codes 28 MultiModemZPX User Guide Command: &S n Data Set Ready (DSR) Control Values: n = 0 or 1 Default: 0 Description: &S0 DSR is always high (on). &S1 DSR goes high only during a connection. Command: &T n V.54 Test Commands Values: n = 0, 1, 3 or 6 Default: None Description: &T0 Abort. St[...]

4 AT Commands, S-Registers, and Result Codes 29 MultiModemZPX User Guide Command: B n Transmit Break Values: n = 0 – 9 in 100 ms units Default: 3 Description: In non-error-correction mode only, sends a break signal of the specified length to a remote modem. Works in conjunction with the K command. Command: J n Data Buffer Control Values: n = 0[...]

4 AT Commands, S-Registers, and Result Codes 30 MultiModemZPX User Guide Command: N n Error Correction Mode Selection Values: n = 0 – 5, or 7 Default: 3 Description: N0 Non-error correction mode with data buffering (buffer mode; same as &Q6 ). N1 Direct mode. N2 MNP reliable mode. If the modem cannot make an MNP connection, it disconnects[...]

4 AT Commands, S-Registers, and Result Codes 31 MultiModemZPX User Guide Command: -C n Data Calling Tone Values: n = 0 or 1 Defaults: 0 Description: -C0 Disables V.25 data calling tone to deny remote data/fax/voice discrimination. -C1 Enables V.25 data calling tone to allow remote data/fax/voice discrimination. Command: %A Adaptive Answer Result Co[...]

4 AT Commands, S-Registers, and Result Codes 32 MultiModemZPX User Guide Command: +DCS= x,y Select V.44 Data Compression Values: x = 0 or 1 (V.42 bis ) y = 0, 1, or 2 (V.44) Default: 1,2 Description: Selects V.42bis/V.44 data compression. +DCS=0,0 V.42bis and V.44 data compression are both disabled. +DCS=0,1 V.42bis is disabled; V.44 data compressi[...]

4 AT Commands, S-Registers, and Result Codes 33 MultiModemZPX User Guide +DS44? Reports current options in the following format: direction , 0, 0, max_codewords_tx , max_codewords_rx , max_string_tx , max_string_rx , max_history_tx , max_history_rx. Example: +DS44: 3, 0, 0, 1024, 1024, 255, 255, 5120, 4096. Subparameters direction Specifies the DTE[...]

4 AT Commands, S-Registers, and Result Codes 34 MultiModemZPX User Guide Command: +MS= Modulation Selection Values: See description. Defaults: See description. Description: This extended-format command selects modulation, enables or disables automode, and specifies the highest downstream and upstream connection rates using one to four subparameters[...]

4 AT Commands, S-Registers, and Result Codes 35 MultiModemZPX User Guide automode An optional numeric value that enables or disables automatic modulation negotiation using V.8 bis/V.8 or V.32 bis Annex A. Automode is disabled if values are specified for the max_rate and max_rx_rate parameters. The options are: 0 Disable automode 1 Enable automode ([...]

4 AT Commands, S-Registers, and Result Codes 36 MultiModemZPX User Guide Command: +PIG= n PCM Upstream Ignore Values: n = 0 or 1 Default: 1 Description: Controls the use of PCM upstream during V.92 operation. PCM upstream allows faster upload speeds to a V.92 server. +PIG=0 D isables PCM upstream +PIG=1 Enables PCM upstream +PIG=? Displays the allo[...]

4 AT Commands, S-Registers, and Result Codes 37 MultiModemZPX User Guide +PMHR=12 Grant MOH request with 16 minute timeout +PMHR=13 Grant MOH request with indefinite timeout +PMHR=? Displays the allowed values +PMHR? Displays the currrent value Command: +PMHT= n Modem on Hold Timer Values: n = 0 – 13 Default: 0 Description: Determines if the mode[...]

4 AT Commands, S-Registers, and Result Codes 38 MultiModemZPX User Guide Command: +VCID= n Caller ID Selection Values: n = 0, 1, or 2 Default: 0 Description: Enables Caller ID detection and configures the reporting and presentation of the Caller ID data that is detected after the first ring. The reported data includes the date and time of the call,[...]

4 AT Commands, S-Registers, and Result Codes 39 MultiModemZPX User Guide Command: +++AT<CR> Escape Sequence Values: n/a Description: Puts the modem in command mode (and optionally issues a command) while remaining online. Type +++AT and up to six command characters, then press ENTER. Used mostly to issue the hang-up command: +++ATH<CR> [...]

4 AT Commands, S-Registers, and Result Codes 40 MultiModemZPX User Guide 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 0 Sets the number of ri[...]

4 AT Commands, S-Registers, and Result Codes 41 MultiModemZPX User Guide S37 decimal 0 – 19 0 Sets the maximum V.34 “ upstream ” speed at which the modem attempts to connect. Value Speed 0 maximum modem speed 1 reserved 2 1200/75 bps 3 300 bps 4 reserved 5 1200 bps 6 2400 bps 7 4800 bps 8 7200 bps 9 9600 bps 10 12000 bps 11 14400 bps 12 16800[...]

4 AT Commands, S-Registers, and Result Codes 42 MultiModemZPX User Guide 19 50666 bps 20 52000 bps 21 53333 bps 22 54666 bps 23 56000 bps S42 decimal 0 – 1 1 Enables/disables the 56K auto rate. When 56K auto is disabled, fallback to V.34 is also disabled. 0 = disable; 1 = enable. S48 decimal 7 or 128 7 Enables (7) or disables (128) LAPM negotia- [...]

4 AT Commands, S-Registers, and Result Codes 43 MultiModemZPX User Guide Result Codes In command mode your modem can send responses called result codes to your com- puter. 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 to line 2 RING Rin[...]

4 AT Commands, S-Registers, and Result Codes 44 MultiModemZPX User Guide 88 DELAYED Delay is in effect for the dialed number 89 BLACKLISTED Dialed number is blacklisted 90 BLACKLIST FULL Blacklist is full 100 CONNECT 28000 * Connected at 28000 bps, 56K rate 101 CONNECT 29333 * Connected at 29333 bps, 56K rate 102 CONNECT 30666 * Connected at 30666 [...]

5 Remote Configuration[...]

5 Remote Configuration 46 MultiModemZPX User Guide Introduction Remote configuration is a network management tool that allows you to configure MT5634ZPX and MT5634ZBA modems anywhere in your network from one location. With password-protected remote configuration, you can issue AT commands to a remote modem for maintenance or troubleshooting as if y[...]

5 Remote Configuration 47 MultiModemZPX User Guide 4. The new password is saved automatically. You can now either enter more AT commands or exit the data communications program. The next time you wish to set up the modem, you must use the new password. T o Change the Remote Escape Character To further improve security, you can change a remote modem[...]

6 Solving Problems[...]

6 Solving Problems 49 MultiModemZPX User Guide 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 of[...]

6 Solving Problems 50 MultiModemZPX User Guide Another expansion card, such as a sound or game card, might be using the same COM port, memory address, or interrupt request (IRQ) as your modem. See Chapter 2 for information on verifying the configuration for your operating sys- tem. Look for conflicts with other devices installed on your computer. R[...]

6 Solving Problems 51 MultiModemZPX User Guide If you must dial 9 to get an outside line, the easiest way to dial it automatically using legacy software is to include it in the modem ’ s dial prefix, e.g., ATDT9, . Note the comma, which inserts a pause before the number is dialed. By inserting 9, into the dial prefix, you do not have to include i[...]

6 Solving Problems 52 MultiModemZPX User Guide The Modem Cannot Connect When Answering The default DTR Control command ( &D2 ) inhibits autoanswer. To enable au- toanswer, change DTR Control to &D0 , and make sure &Q0 , &Q5 , or &Q6 is also set. For more information, see the &D command in Chapter 4. For informa- tion on chan[...]

6 Solving Problems 53 MultiModemZPX User Guide There Are Garbage Character s on the Monitor Your computer and the remote computer might be set to different word lengths, stop bits, or parities. If you have connected at 8-N-1, try changing to 7-E-1, or vice-versa, using your communication software. You might be experiencing line noise. Enable error [...]

6 Solving Problems 54 MultiModemZPX User Guide V oice Mail T est Te s t th e MultiModemZPX ’ s voice function by using the included software to set up the MultiModemZPX for voice mail. Have an acquaintance call and leave a message, and then play it back. If your modem does not play sound files in voice mode, go to Windows Control Panel and double[...]

Appendixes[...]

A Regulatory Compliance 56 MultiModemZPX User Guide Appendix A: Regulator y Compliance FCC P ar t 68 T elecom 1. This equipment complies with part 68 of the Federal Communications Commission Rules. On the outside surface of this equipment is a label that contains, among other information, the FCC registration number. This information must be pro- v[...]

A Regulatory Compliance 57 MultiModemZPX User Guide Service Center in USA: Multi-Tech Systems, Inc. 2205 Woodale Drive Mounds View, MN 55112 U.S.A. (763) 785-3500 (763) 785-9874 Fax FCC Part 15 This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are desi[...]

A Regulatory Compliance 58 MultiModemZPX User Guide Canadian Limitations Notice Notice: The ringer equivalence number (REN) assigned to each terminal device pro- vides an indication of the maximum number of terminals allowed to be connected to a telephone interface. The termination on an interface may consist of any combination of devices subject o[...]

A Regulatory Compliance 59 MultiModemZPX User Guide EMC, Saf ety , 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[...]

A Regulatory Compliance 60 MultiModemZPX User Guide 6. This equipment may not provide for the effective hand-over of a call to another device connected to the same line. 7. Some parameters required for compliance with Telecom ’ s Telepermit require- ments are dependent on the equipment (PC) associated with this device. The as- sociated equipment [...]

B Technical Specifications 61 MultiModemZPX User Guide Appendix B: T e chnical Specifications The MultiModemZPX modem meets the following specifications: Trade Name MultiModemZPX ™ Model Number MT5634ZPX-PCI Build Number MT5634ZPX-PCI-V92 Server-to-Client 56K speeds when accessing a V.90 or V.92 server (actual Data Rates speed depends on server c[...]

B Technical Specifications 62 MultiModemZPX User Guide call status display, auto-parity and data rate selections; keyboard-controlled modem options; non-volatile memory; remote configuration; DTR dialing; callback security; A-law support in 56K modes; 11-bit support; real-time fax compression conversion; U.S. Caller ID reporting; quick- connect sta[...]

C Loopback Tests 63 MultiModemZPX User Guide Appendix C: Loopbac k 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[...]

C Loopback Tests 64 MultiModemZPX User Guide 3. Enter characters from your keyboard. For this test, typing multiple uppercase U characters is a good way to send an alternating test pattern of binary ones and zeros. The characters entered should be displayed on your monitor. 4. To exit the test, type the escape sequence +++AT and press E NTER . This[...]

C Loopback Tests 65 MultiModemZPX User Guide 6. Enter data from your keyboard. For this test, typing multiple uppercase U char- acters is a good way to send an alternating test pattern of binary ones and zeroes. Data received by the remote modem enters its analog receiver, is converted to digital data, is reconverted in to ana lo g, a nd th en i s [...]

C Loopback Tests 66 MultiModemZPX User Guide 6. To exit the test, type the escape sequence +++AT and press E NTER . This puts the modem in online command mode. The modem should respond with an OK message. If you wish to stay on line with the remote modem for normal data transmission, type AT&T and press E NTER to exit the test, then type ATO an[...]

D Warranty, Service, and Technical Support 67 MultiModemZPX User Guide Appendix D: W arranty , Service , and T echnical Suppor t 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 ten years from the date of purchase or, if date of purchase is not provided,[...]

D Warranty, Service, and Technical Support 68 MultiModemZPX User Guide For out of warranty repair charges, go to http://www.multitech.com/documents/warranties . Extended two-year overnight replacement agreements are available for selected products. Please call MTS at 888 288-5470, extension 5308, or visit our web site at http://www.multitech.com/PR[...]

D Warranty, Service, and Technical Support 69 MultiModemZPX User Guide T echnical Suppor t Multi-Tech Systems 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, please call 800 972-2439 (USA and Canada) or 763 785-3500 ([...]

E Upgrading the Modem 70 MultiModemZPX User Guide 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 [...]

E Upgrading the Modem 71 MultiModemZPX User Guide Step 2: Identify the Current Firmware V ersion Identify the current version of your modem ’ s 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/MultiModemZ[...]

E Upgrading the Modem 72 MultiModemZPX User Guide 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&W1Z and press E NTER to clear your stored parameters and reset your modem to factory d[...]

73 F Installing Under Linux MultiModemZPX User Guide Appendix F: Installing Under Linux Introduction This appendix explains how to install a modem on a computer operating under the Red Hat Linux 6.2 operating system. Other versions of Red Hat and other Linux op- erating systems should be similar. Briefly, in Linux, you do not need drivers for most [...]

74 F Installing Under Linux MultiModemZPX User Guide Note: The preceding example places the modem on COM3. Your IRQ and port may vary. Substitute the IRQ and port values in the example with the values for your computer as listed in the results of the command issued in step 3. To set Linux to configure the modem at boot-up, use an editor such as “[...]

75 F Installing Under Linux MultiModemZPX User Guide Calling the ISP 1. On the Task Bar at the bottom of the screen, select the Gnome Footprint. 2. Select Internet from the menu. 3. Select RH PPP Dialer . 4. Select the connection name you entered in step 5 of the previous section. 5. Click OK . Answering Calls To use the system for answering calls,[...]

G Installing Under SCO OpenServer 76 MultiModemZPX User Guide Appendix G: Installing Under SCO OpenServer Introduction This appendix explains how to install a modem on a computer operating under the SCO OpenServer 5.0.x operating system. Briefly, in SCO OpenServer , you do not need drivers for most modems. Programs in SCO OpenServer commonly call u[...]

Index[...]

Index 78 MultiModemZPX User Guide Symbols 56K operation digital loss when used with PBX 42 disabling the auto rate 42 maximum connect speed 41 mode selection 42 A abort timer 40 Adaptive Answer Result Code Enable command 31 analog loopback test 63 – 64 Answer command 23 Asynchronous Communications Mode command 27 A T commands 22 – 44 #S 38 #S= [...]

Index 79 MultiModemZPX User Guide F fallback 25 Fallback and Fall Forward command 31 fax communications 19 – 20 faxing from a W indows application 19 FCC regulations 56 – 57 firmware upgrading 70 – 72 version 24 flash 36 flash memory 70 Flash W izar d upgrade utility 71 flow control 27, 30 Flow Control Selection command 27, 30 G garbage chara[...]

Index 80 MultiModemZPX User Guide V V .22 mode 23 V .22bis Guard T one Control command 27 V .25 data calling tone 31, 40 V .34 modulation, enabling 40 V .42 error correction 30 V .42bis Compression Control command 31 V .42bis data compression 31 V .44 data compression 32 V .44 Data Compression command 32 V .44 Data Compression Reporting command 32 [...]