This manual is provided to you in electronic format. It is supplied for the sole purpose of documenting and supporting Mult-Tech Systems' products. Any translation, modification, or unauthorized copying of this manual is strictly prohibited. The information contained herein is protected by U.S. copyright laws and international treaties. This text only manual is based on the MT2834PCS owner’s manual, P/N 82035801, Rev. B. 1.1 Introduction Data Communications has been laboring towards providing multifunction service over a single phone line since the inception of the Integrated Services Digital Network (ISDN). Now, as the capabilities of analog, copper phone lines have been expanded beyond what was thought possible a few years back, this multifunctionality is on your desktop. Multifunction means that your Personal Communication System (PCS), is capable of supporting more than one type of communication session. The patent-pending PCS hardware, the MultiModemPCS (model MT2834PCS), is capable of performing like a business or residential telephone, a computer fax system, or a modem in any environment. You can run your own communication software and issue the commands which put the MT2834PCS in telephone, modem, or Digital Simultaneous Voice Data (DSVD) mode, and it's compatible with any CCITT V.17 Group 3 fax software based on the de facto EIA TR-29 Class 2 command set. The patent-pending software portion of the PCS is MultiExpressPCS, a Windows 3.1 desktop communication package specially designed for the MT2834PCS modem. With MultiExpressPCS running on your PC, you can fax from any Windows application, record telephone conversations, edit voice files, compose multimedia messages (i.e., text, graphics, and voice notes all in one document), and use such telephone features as speed dialing, mute, hold, call forwarding, call transferring and three-way (conference) calling. The features of MultiExpressPCS are recounted in more depth by the MultiExpressPCS Software Manual. The MT2834PCS's Digital Simultaneous Voice Data mode with TalkAnytimeTM, lets you speak with the person at the other end while maintaining a PCS-to-PCS datacomm link. Since the TalkAnytime feature is strictly a hardware feature, you can use communications software without reprogramming, changing setup strings, or reconfiguring the modem. TalkAnytime activates Digital Simultaneous Voice Data communications anytime the handset is picked up, thus activating the "modem" and "telephone" circuits and supporting dual communications over a single phone line. This manual will help you get the MT2834PCS installed on your system, and it will serve as a reference for the modem's operation (i.e., "AT" commands, S-Registers, Option Switch Settings, etc.). 1.2 How To Use This Manual This manual is divided into several chapters. There are also appendices at the end of the manual which reiterate information presented in the main text, in a condensed form. These can be used as quick-reference sections. The information contained in each chapter and appendix is as follows: Chapter 1 - Introduction and Description Chapter 1 begins with a short introduction followed by a guide (which you are now reading) to the use of the manual. There is a discussion about what components you can expect to be in the MT2834PCS package followed by a more detailed description of the modem. Chapter 2 - Installation and Connection Chapter 2 covers the procedure for connecting the MT2834PCS to your computer and to the phone line. It also details what you will need to know about installing your MT2834PCS modem to the point of operation with illustrations on the MT2834PCS's back panel connections and PC Board controls. This chapter also covers the MT2834PCS's DIP-Switch default and optional settings, telephone connections when operating in dial-up or lease line modes, basics on Dialing/On-Line/Answering modes, and definition on the MT2834PCS's LED indicators. Chapter 3 - Using the MT2834PCS (Digital Simultaneous Voice Data Mode) Chapter 3 discusses modes of operation, the means by which a Digital Simultaneous Voice Data session (Voice-Over-Data) is established and the nature of the MT2834PCS' Talk Anytime feature. This chapter also describes some of the most common user-configurable AT-Style Digital Simultaneous Voice Data Commands. Chapter 4 - "AT" Commands and S-Registers Chapter 4 provides basic steps for originating and answering calls and a summary of commands which enable the user to establish, read, and modify parameters in addition to dialing. This chapter is focused more on the traditional "data" mode aspect of the MT2834PCS capabilities with the use of "AT" commands and S-Registers. Chapter 5 - Testing Your Modem Chapter 5 covers the modem's built-in test features. These are: Power- on Self Test, Local Analog Loopback Test, and Remote Digital Loopback Test. We have included a description of each test and how to use each testing feature. Appendices Appendix A - FCC, Canadian and BABT Regulations Appendix B - Technical Specifications Appendix C - Multi-Tech Supervisory Protocol Appendix D - Tone Dial Frequencies 1.2.1 Typographical Conventions Within this manual, and many others provided by Multi-Tech Systems, there are a few typographical conventions used to minimize confusion. One convention is the non-overstricken "0" (number zero). Please note that our upper case "O" is quite similar. The "Return" or "Enter" key is labeled in various ways, depending on the model keyboard and on your system. We refer to this key as , which means for you to press the "Return" or "Enter" key on your keyboard. The "Control" key (abbreviated "Ctrl" on many keyboards) may also be referenced in this manual. This key, and any others to which we may refer, are set off by angle brackets -- like so: . If the key is used in combination with another key, we use the Windows convention of the key, a plus sign, and the next key -- like so: +X. In this case, you should press and hold the first key while you strike the second. If more than two keys are called for in a sequence, hold down each key and then strike the last one. For example, if we instruct you to reset your computer by pressing ++, you should press and hold the and keys, then strike the key. Finally, there are two ways in which we set off text. We use boldúitalic formatting to set off the commands as they are described. If you see text that is bold, you should type exactly what is shown, and then press any keys listed. 1.3 What is in Your Personal Communication System? Your Personal Communication System has several components. Make sure you received them all before you install the modem or its software. Your package should include: * The MT2834PCS modem * An RJ11 telephone cord or BS6312 Plug (BABT) * An AC Power transformer * MT2834PCS Owner's Manual (this manual) * One Intelligent Serial Interface Card (ISI) model ISI551 (bundled with model MT2834PCS/ISI only) * ISI551 Owner's Manual If one or more of these is missing, please contact Multi-Tech Systems or your dealer/distributor. 1.4 Description Your MT2834PCS performs as a telephone, fax machine, or traditional modem. These modes of operation are provided by the modem's electronics and can be controlled by any software package from which the appropriate commands can be issued. Multi-Tech's MultiExpressPCS software package provides programs which control all these functions. With MultiExpressPCS running on your computer (under Microsoftr Windows), your MT2834PCS can also be used as an answering machine (i.e., voice messaging service), a voice editor for digitized voice files, or as a multimedia message composer. MultiExpressPCS also provides a database utility for storing information useful in contacting people or organizations with fax, multimedia mail or voice message transmittals. For more information on the MultiExpressPCS communication software, refer to the MultiExpressPCS Software Manual. Your MT2834PCS modem is designed according to the International Telecommunication UnionTelecommunications Standards Sector (ITU- T) V.34 standard (formerly CCITT) for data signalling rates as high as 28.8/26.4K bps full-duplex mode. Connections can be made on Public Switched Telephone Networks (PSTNs) and/or point-to-point 2-wire telephone type circuits. V.34 is an extension of the V.32/V.32bis/V32terbo standards. V.34 supports and is compatible with all V.32/V.32bis/V32terbo features including EIA extended Automode, adaptive line probing, automatic symbol rate and carrier frequency during start-up, and retrain and rate renegotiation (in 2400 bps increments). For fax transmissions, the MT2834PCS -- together with the MultiExpressPCS "Fax Manager" handles faxes according to the CCITT V.17 standard at 14,400 bps when linked with another fax modem or fax machine capable of V.17 performance. It complies with the CCITT's Group 3 Designation at 9600, or Group 2 (4800 bps) depending on the other fax system involved. The MT2834PCS is also downward compatible with modems at speeds as low as 300 bps. This enables the modem to send/receive text, graphics, and images with virtually any fax machine in the world. With CCITT V.42 error correction and V.42bis data compression, data sent will be 100% error free. V.42 error correction incorporates both MNPr Classes 3 and 4 and LAP-M. Data compression can be V.42bis for 4-to-1 throughput improvement or MNP Class 5 for 2-to-1 throughput. The MT2834PCS offers interactive automatic dialing capability, as well as Command Mode option configuration. Up to ten command line/telephone numbers, of up to 60 digits each, can be stored in the modem's nonvolatile memory. The modem uses pulse and/or tone dialing methods, and has the ability to recognize dial tones and busy signals for reliable call-progress detection; and the MT2834PCS has the capability to detect AT&T "call card" tones for the purpose of accessing the user's calling card before an on-line connection is made. The MT2834PCS is FCC-Registered for connection to the telephone networks. No Data Access Arrangements (DAA's) are required. Callback Security provides MT2834PCS users with a means of protecting their networks from unauthorized users. By use of the modem's automatic login routines and phone number/password directory, host sites can, after receiving a call, "callback to" a remote site at a predetermined number. This feature can also be used to reduce phone line costs for users through host site call origination. Remote Configuration gives users network management capability. Users can configure modems at remote sites from local modems, without having to visit the sites or rely on users to follow instructions. The modem link between two MT2834PCSs becomes a point-to-point packet network during Digital Simultaneous Voice Data mode (voice- over-data). This transmission between traditional modem communications (where data is transferred) to packet mode (where packets of data, digitized voice, or commands are transferred in the same stream) is done automatically when the attached telephone device handset is placed off-hook (Talk Anytime feature). The MT2834PCS uses a patent-pending Multi-Tech Supervisory ProtocolTM (MSP) to discern data streams, voice streams, and commands while on-line with another MT2834PCS; and thus uses the same analog line to do so. The MT2834PCS contains all the circuitry necessary for Digital Simultaneous Voice Data operation. Therefore, Talk Anytime engages voice-over-data mode when the MT2834PCSs are connected to terminals, any type of processor running "AT-compatible" datacomm software, or other async devices which have standard RS232 serial ports for the modem connection. The only limitation is that there must be a MT2834PCS on each end of the phone-line for voice-over-data mode to be activated. 2.1 Introduction The installation of the MT2834PCS 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. The installation instructions are followed by a brief section on issuing AT commands to the modem to manually dial or disconnect from another computer. 2.2 Installation The following list is an overview of the steps to installing your MT2834PCS: 1. Connect the modem to your computer using an available serial port and a straight-through RS232C cable (or V.24 equivalent). Note: Cables connected to the computer must be shielded to reduce interference. 2. Connect the modem to the PSTN/Leased line using the RJ-11 jack labeled "LINE" (see Figure 2-1). 3. Connect the modem to AC power through the AC power adapter supplied with the modem (see Section 2.2.1). 4. Connect the telephone accessory to the appropriate RJ-11 jack on the MT2834PCS's back panel (see Figure 2-1). WARNING: Failure to make the appropriate connection (e.g., using the RJ11 jack intended for "LINE" connection, and plugging it into the MT2834PCS's "PHONE" connection), may produce a harmful effect on the operation of your MT2834PCS. 5. Turn on power by flipping the "ON/OFF" switch at the left rear of the MT2834PCS to the "ON" position (up). 6. Verify remote modem's current configuration settings with your MT2834PCS in terms of data compression, error correction, transmission rate, etc. (per Chapter 4, ATL5 and ATL7 Commands); or Configuration setting establishing a Digital Simultaneous Voice Data link (per Section 3.4 and Appendix C). 7. Attach MT2834PCS to dial-up phone lines or leased lines (per Section 2.2.4) and verify DIP-Switch #10 and #5 settings. Verify leased line transmit level (DIP-Switch #3) setting (per Section 2.2.4). 8. Verify self-test results (Chapter 5). 2.2.1 Applying 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 to the attached telephone device. The transformer plugs into any conventional 115 volt AC, 60 Hz, two-prong power outlet, and should be the only power source used with the MT2834PCS. Use of any other transformer could cause damage to this device. Connect the modem's AC power transformer to a live AC outlet, and connect the end of the power cord to the POWER connector on the back of the modem. Once all connections have been made, you can apply power to the MT2834PCS by flipping the power switch (at the left rear when the modem is facing you) to the "ON" position (up). As soon as you connect power to the modem, it performs a diagnostic self-test, indicated by the speed indicators flashing in sequence for approximately four seconds, then the 28.8 indicator should light. The TR indicator should also light at the same time for most installations. The SD, RD, CD, and OH indicators should remain off at this time. If this does not happen, check that the transformer is solidly connected and that the AC outlet is live. Refer to Chapter 5 for more information on modem testing. 2.2.2 PC Board Controls The MT2834PCS is designed on a single printed circuit (PC) board. This board contains one block of 16-position DIP-Switches (numbered 1-16). These Switches are accessible through a cut-out on the side of the modem. Located on the front of the modem is a Voice/Data "toggle" switch with Originate/Answer capabilities. This switch enables the modem to automatically dial a phone number stored in the N1 location of memory whenever this switch is toggled. If you are "Manually" dialing with an attached telephone device (and not with your keyboard), your modem originates when toggled in that position; and if you are "Manually" answering (modem is not configured to automatically answer via S-Register S0 setup), the MT2834PCS answers an incoming call when toggled in that position. There are also two RJ11 style modular phone jacks, one for PSTN or leased line connection, and the second for connection of your telephone device for Digital Simultaneous Voice Data application and a knob for adjusting speaker volume. It is unlikely you will need to access the interior of the modem, but if you do, you must remove the modem's PC board from the modem's chassis. To remove the PC board, remove the retaining screw (on the bottom of the modem near the RS232 connector), and slide the PC board out of the modem chassis. The sixteen DIP-Switches control various modem options or set default values for Command mode operation. There is a difference in how several of the switches operate depending on whether you are in synchronous or asynchronous mode. Refer to the switch label on the bottom of the MT2834PCS for an exact list of the switch functions in asynchronous and synchronous operation. 2.2.3 DIP-Switch Settings The MT2834PCS typically is used to dial up a remote installation where the call is automatically answered. The factory default DIP- Switch settings are based on this assumption. The following is a brief description and summary of the MT2834PCS's DIP-Switch options: Switch Function Position Effect #1 DTR Forced/DTR from Interface* UP* DTR forced from DOWN computer/terminal #2 Flow Control &E4* (Async/ UP* Hardware flow Dial-Up/Leased Line) DOWN control enabled #2 SDLC*/BSC (Sync) UP* SDLC enabled DOWN #3 Result Codes Enabled* (Async UP Modem responses Dial-up) DOWN* are enabled (echoed) #3 DbM Transmit 0dB*/-10dB UP Lease Line (Async/Sync/Lease-Line) DOWN* transmits at 0dB (Note that this switch in this mode is not applicable to the MT2834PCSK) #4 AS/400 Mode Disabled* (Sync UP* AS/400 Mode Dial-Up/Leased line) DOWN Disabled #5 Auto-Answer Enabled* (Async UP* Auto-Answer Sync/Dial-Up) DOWN in dial-up mode #5 Answer*/Originate UP* Originate call in (Async/Sync/Leased Line) DOWN Lease Line mode #6 Max-Throughput Enabled* UP* Modem set-up to (Async/Dial-Up/Leased) DOWN operate at highest efficiency level #6 Slave Clock Disabled* UP* Clock controlled (Sync/Dial-Up/Leased) DOWN by remote device #7 RTS/Normal/Forced* UP Request To Send (Sync/Async/Dial/Leased) DOWN* Forced On #8 Command Mode Enabled* UP Command Mode (Sync/AsyncDial/Leased) DOWN* Enabled #9 Local/Remote LoopBack* UP Remote (Async/Sync/Dial/Leased) DOWN* LoopBack Enabled #10 Dial-Up*/Leased-Line UP* Dial-Up Enabled DOWN #11 "AT"/Multi-Tech Result Codes* UP Multi-Tech (Asynchronous) DOWN* Result Codes Enabled #11 Internal*/External Clocking UP Selects Transmit (Synchronous) DOWN* Clock Source #12 Sync/Async Mode* UP Asynchronous DOWN* Mode Enabled *Factory Default Setting DIP Switches #13-16 Switch Condition Effect #13/#14 UP/UP* 28.8 K bps Operation (Default) #13/#14 DOWN/UP 19.2 K bps Operation #13/#14 UP/DOWN 14.4 K bps Operation #13/#14 DOWN/DOWN 9600 bps Operation #15 UP* CD/DSR from Interface #15 DOWN CD/DSR Forced On #16 UP Used in combination #16 DOWN with DIP-Switch #9/Loopback Tests (see Chapter 5 for Loopback Tests) 2.2.4 Telephone Connections (Dial-Up/Leased Lines) The MT2834PCS modem is designed for communications over Public Switched Telephone Networks (PSTNs) lines in dial-up or leased-line mode. Connection to the PSTN can made via RJ11-type jacks such as the RJ11C or RJ11W (dial-up/leased line mode use the same RJ11 connection). When in dial-up mode, the MT2834PCS is designed to transmit at a permissive level of -10 dBm. In leased-line mode, the MT2834PCS's transmission level is 0 dBm, with an optional -10 dBm setting (not applicable for the MT2834PCSK). To connect the MT2834PCS modem to the phone line, plug one end of the RJ11 cable provided with the modem into the connector labeled "LINE", and the other end into an RJ11-style modular wall jack provided by the phone company. Make sure that DIP-Switch #10 is in the UP position (default). To connect the modem to leased lines, first determine the type of line termination provided by the phone company. Most phone companies provide a terminal block with a pair of screws. Some provide a conventional RJ11 type of connector. If the RJ11 connector is used, you can use the same cable that you use for dial-up connection (for BABT connections, a BS6312 Plug is used). If the screw terminal type connector is used, you may need to order the appropriate cable (#CA167) from Multi-Tech Systems . Make two DIP-Switch setting changes on the modem's PC board to enable leased line mode. The first involves placing DIP-Switch #10 in the DOWN position (changes the modem from dial-up to leased line operation). The second DIP-Switch change requires that one of the two modems on the leased line circuit is set to "originate", and the other is set to "answer". To do this, change the setting of DIP-Switch #5. When you changed the DIP-Switch #10 setting, you also changed the function of DIP-Switch #5. Now the UP position selects answer mode while the DOWN position selects originate mode. Place DIP-Switch #5 in the UP position on one of the two modems, and on the other modem, place Switch #5 DOWN. It doesn't matter which is which, just so you have local and remote modems in opposite modes. To connect the MT2834PCS modem to utilize telephone accessory, plug one end of the RJ11 cable provided with the modem into the connector labeled "PHONE", and the other end into the telephone's RJ11-style connector. 2.3 Dialing/On-Line/Answering There are several basic steps for "originating" and "answering" in data communication mode: 1. Load communication software 2. Dial 3. Establish On-Line connection 4. Terminate Call A simple way to dial is from the keyboard of your computer or terminal. You enter a command on the keyboard to tell the MT2834PCS to dial. If you use one of the more sophisticated communications software packages (e.g., MultiExpress), the software tells you to enter phone numbers and other information. If this is the case, the software, and not you, gives the dialing commands to the modem. All of the commands, S-Registers and intelligent features of the MT2834PCS are taken care of by the software. If you are giving commands directly to your modem (and not through your software), each command must begin with AT (ATtention Characters). AT characters may be entered in upper or lower case. Entering AT automatically sets the modem's speed to match the speed of the computer or terminal, and also sets the modem's parity. If you are using a terminal, you can issue commands directly, but computers must be placed in terminal mode before the modem recognizes commands. To operate a computer in terminal mode, you must run a datacomm package like MultiExpress, or MultiExpress for Windows, depending on the type of datacomm call you want to place and whether you are calling under DOS or Windows environment. Refer to your software's documentation to load and run the datacomm software. Once your computer is in terminal mode, the procedure for establishing a call (using AT commands) is the same as the procedure for users of terminals. AT characters alert the modem that a command follows. The AT Command can also be used to clear the command buffer, by simply typing AT and hitting RETURN. The letter D in a command causes the modem to dial the numbers immediately following it (e.g., ATD6127853500--tone dialing method only). The MT2834PCS responds with "CONNECT" on your video display after the number is dialed and a connection signal is detected (since the MT2834PCS defaults to V.34/V.42/V.42bis, the actual response is "CONNECT 28800 LAPM COMPRESSED"), if the MT2834PCS "connects" with a similar modem (see section 4.3 Result Codes). The modem is now in "On-Line" mode, and is ready to communicate with a host site. If no connection signal is detected within 45 seconds (this time period can be adjusted by S-Register S7--see section 4.2 on S-Registers), the MT2834PCS goes On Hook/hangs up and returns to Command mode. At this point, your video displays "NO CARRIER". Enter ATH to Hang Up On-Line (bring modem on-hook), and terminate the modem's On-Line mode. At this point, your video displays "OK". In addition to the call originating capabilities, the MT2834PCS can also automatically answer incoming calls. You need not be present. You can, however, control the situation by configuring the modem to either answer or not to answer, or to answer after a specified number of rings. This is done by setting the value of S-Register S0 (modem defaults to automatically answer an incoming call after one ring). 2.4 Modem LED Indicators The MT2834PCS has fourteen diagnostic LED indicators. They are: 1) Transmit (Send) Data (SD). This LED blinks when data is being transmitted, on for a space, off for a mark. The state of this LED matches the TD circuit on Pin 2 of the RS232C/V.24 interface. 2) Receive Data (RD). This LED blinks when data is being received, on for a space, off for a mark. The state of this LED matches that of the RD circuit on Pin 3 of the RS232C/V.24 interface. 3) Carrier Detect (CD). This LED is lit when a valid carrier tone has been detected. 4) 28,800 bps (28.8). This LED is lit when the modem is connected at 28,800 bps. Note: if the modem falls back to 26.4K bps while in V.34 mode, both the 28.8 and 24.0 LEDs light. 5) 24,000 bps (24.0). 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. 6) 19,200 bps (19.2). This LED is lit when the modem is connected at 19,200 bps. 7) 14,400 bps (14.4). This LED is lit when the modem is connected at 14,400 bps. Note: if the modem falls back to 12,000 bps while in V.32bis mode, both the 14.4 and 96 LEDs light. 8) 9600 bps (96). This LED is lit when the modem is connected at 9600 bps. 9) 2400 bps (24). This LED is lit when the modem is connected at 2400 bps. 10) Off Hook (OH). This LED is lit when the phone line is "off hook". This occurs when the modem is dialing, on-line, or answering a call. This LED also flashes when the modem is pulse dialing in Command mode. 11) Terminal Ready (TR). When the TR LED is lit, the modem is permitted to answer an incoming call. When it goes off, a connected modem will disconnect. The state of the TR LED matches that of the DTR circuit on Pin 20 of the RS232C/V.24 interface. 12) Error Correction (EC). This LED is lit when the modem is set for V.42 error correction, and flashes on and off when data compression is activated. 13) FAX (FX). This LED is lit when the modem is connected in FAX mode. 14) ERROR (ERR). When this LED is lit, either the leased line is down, or else the self-test has failed. 3.1 Digital Simultaneous Voice Data Communications In addition to a conventional modem's command and on-line modes, the MT2834PCS has a "packet mode" in which it can receive packets of voice, data, or commands from the PC while it is on-line. A header in each packet uniquely identifies its contents. In conventional (non-PCS) modem operation, the on-line connection between modems must be suspended, by "escaping" to command mode, before commands can be issued to the modem. But your PCS uses our patent-pending Multi-Tech Supervisory Protocol, (MSP), to discern data streams, voice streams, and commands while it's on-line with another PCS (e.g., MSP is utilized when the PCS is used for recording and playing back voice messages in answering machine mode). This packet mode allows the connected PCSs to transmit voice and data over the same analog phone line, at the same time. 3.2 Establishing a Digital Simultaneous Voice Data Link Establishing a Digital Simultaneous Voice Data link means that the modem and attached telephone device, are each set up using a single phone line. This Digital Simultaneous Voice Data communication is made possible by buffering incoming voice and data streams, separately packetizing portions of each, and then multiplexing both types of packets over the same line. The multiplexing schemes gives priority to voice packets so your verbal communications go uninterrupted. All of this relies on the connection being established between two MT2834PCSs. Once a data connection is established through your Data Comm software (e.g., MultiExpress using AT commands), a Digital Simultaneous Voice Data link is established by lifting the connected telephone accessory handset from its handset cradle. This method activates the Talk AnytimeTM feature, which establishes a voice and/or Digital Simultaneous Voice Data link anytime the handset is picked up. 3.2.1 About Talk AnytimeTM Using Multi-Techs' patent-pending Talk AnytimeTM feature, you can switch to Digital Simultaneous Voice Data mode without having to first configure the modem. Once a data link is established between two MT2834PCS modems, a Digital Simultaneous Voice Data link begins by lifting the handset from the telephone accessory connected to your modem. This engages your modem to "ring" the remote modem (you will hear the remote modem ringing through your handset just like a normal phone). When the remote side receives the "ring", the MT2834PCS beeps twice every four seconds to get the remote user's attention. When the remote user answers the call (picks up the handset), talking can begin using a Digital Simultaneous Voice Data link while still passing data. To end the Digital Simultaneous Voice Data link, simply hang-up the telephone. The data link continues without interruption. If at the end of conducting a voice connection, one side neglects to hang-up, a "beeping" tone sounds 10 seconds afterwards. This beeping tone occurs every 1/2 second to alert the user to hang-up the phone. 3.3 Voice Activation Commands A voice modem must detect, recognize and act upon specific DTMF signals. (The DTMF signals are tones used over the phone lines to indicate which key has been pressed on the phone's keypad.) Special firmware in the modem looks for the specific frequencies assigned to each number, and reports on which DTMF signal is present. Application software can use this information to perform tasks, such as activating the answering machine, if the caller presses one number to leave a voice message, or go to fax mode if the caller selects another number to send a fax. The special modem commands needed for controlling voice include selection of handset (speaker/microphone), control of voice volume, ambient noise sensitivity, and ring control. In typical Voice-Over-Data applications, the following commands will be the only configuring the user may have to perform: Ambient Noise Sensitivity Options (>HV) This command can be issued with one of fifteen sensitivity levels. Each value closest to zero makes the modem more sensitive to ambient noise (e.g. AT>HV0 makes the modem most sensitive to ambient noise). AT>HV0 = Most Sensitive. AT>HV14 = Least Sensitive. The factory default setting is >HV7. * Appendix C addresses commands which enable users to manually program the MT2834PCS for specific applications. Microphone Mode of Operation (>M) The attached telephone device can be put in one of two operational modes using this command. AT>M0 deactivates the telephone's mouthpiece to OFF mode. AT>M2 activates the telephone's mouthpiece to ON mode.The modem must be issued a command to set its telephone mouthpiece volume (see >MV command) on the same line as this command, or the selected mouthpiece mode of operation will not be activated. The mouthpiece accessory selected must match the earpiece accessory selected (i.e., AT>S0>M0 or AT>S2>M2). AT>M0 = Deactivates Telephone Mouthpiece. AT>M2 = Activates Telephone Mouthpiece. The factory default setting is >M2. Microphone Volume (>MV) The MT2834PCS/c telephone's mouthpiece can be set to one of fourteen levels using this command. AT>MV0 sets the mouthpiece activated by the AT>Mn command to its lowest volume level, while AT>MV14 sets the mouthpiece to its highest volume level. AT>MV0 = Lowest Volume Level. AT>MV14 = Highest Volume Level. Setting is User Selectable. Speaker Mode of Operation (>S) The attached telephone device can be put in one of two operational modes using this command. AT>S0 deactivates the telephone's earpiece to OFF mode. AT>S2 activates the telephone's earpiece to ON mode (factory default). The modem must be issued a command to set its earpiece volume (see >SV command) on the same line as this command, or the selected earpiece mode of operation will not be activated. AT>S0 = Deactivates Telephone Earpiece. AT>S2 = Activates Telephone Earpiece. The factory default setting is >S2. Speaker Volume (>SV) The MT2834PCS/c's speaker (or earpiece) can be set to one of ten levels using this command. AT>SV1 sets the earpiece activated by the AT>SVn command to its lowest volume level, while AT>SV9 sets the earpiece to its highest volume level. AT>SV0 = Lowest Volume Level. AT>SV9 = Highest Volume Level. The factory default setting is >SV7. 4.1 Modem AT Commands 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 a summary and brief explanation of the AT commands (primarily used in typical "data" mode) recognized by the MT2834PCS. COMMAND: AT VALUES: n/a DEFAULT: n/a DESCRIPTION: Attention Code that precedes most command strings except A/, A: and Escape Codes. COMMAND: Return VALUES: n/a DEFAULT: n/a DESCRIPTION: Pressing RETURN key executes most commands. COMMAND: A VALUES: n/a DEFAULT: n/a DESCRIPTION: Answer call, even if no ring present. COMMAND: $ VALUES: n/a DEFAULT: n/a DESCRIPTION: This symbol placed in dialing string enables the modem to detect AT&T's "call card" tones to access user's calling card to originate an on-line connection. COMMAND: A/ VALUES: n/a DEFAULT: n/a DESCRIPTION: Repeat last command. (Do not precede this command with AT. Do not hit RETURN to execute.) COMMAND: A: VALUES: n/a DEFAULT: n/a DESCRIPTION: Continuous redial (10 redials in DOC units) of last number until answered. (Not used Internationally or in the MT2834PCSK.) COMMAND: $An VALUES: n = 0 or 1 DEFAULT: $A0 DESCRIPTION: $A0 discards data during auto-reliable time period. $A1 buffers data during auto-reliable time period. COMMAND: #An VALUES: n = 0 thru 3 DEFAULT: #A0 DESCRIPTION: #A0 selects initial handshake at 28,800 to 24000 to 21600 to 19,200 to 16,800 to 14,400 to 12,000 to 9600 to 4800 to 2400 to 1200 to 300 bps. #A1 selects initial handshake at 28,800 bps only. #A2 selects initial handshake at 28,800 to 24000 to 21600 to 19,200 to 16,800 to 19,200 to 14,400 to 9600 to 4800bps #A3 selects initial handshake at 2400 to 1200 to 300 bps. COMMAND: Bn VALUES: n = 0 or 1 DEFAULT: B0 DESCRIPTION: B0 selects V.21 for 300 bps operation. B1 selects for 300 bps operation. (Not used Internationally or in the MT2834PCSK.) COMMAND: &Bn VALUES: n = 0 or 1 DEFAULT: &B0 DESCRIPTION: &B0 means normal transmit buffer size. &B1 means reduced transmit buffer size. COMMAND: &BSn VALUES: n = 0 or 1 DEFAULT: &BS1 DESCRIPTION: &BS0 means maximum transmit block size of 64 characters. &BS1 means maximum transmit block size of 256 characters (MNP mode)/128 characters (LAP-M mode). COMMAND: $BAn VALUES: n = 0 or 1 DEFAULT: $BA0 DESCRIPTION: $BA0 means speed conversion is on. $BA1 means speed conversion is off. COMMAND: &Cn VALUES: n = 0, 1, 2 or 4 DEFAULT: &C1 DESCRIPTION: &C0 forces Carrier Detect on. &C1 lets Carrier Detect act normally. &C2 lets Carrier Detect drop S24 time on disconnect. &C4 resets modem when Carrier Detect drops. COMMAND: Ds VALUES: s = phone # DEFAULT: n/a DESCRIPTION: Dial a telephone number "s", where s may include up to 60 digits or T, P, R, comma and ; characters. COMMAND: DsNd VALUES: s = phone # and d = 0 thru 9 DEFAULT: n/a DESCRIPTION: Store telephone number. To store, phone number "s" is entered and followed by N and then Directory Number "d." COMMAND: &Dn VALUES: n = 0 thru 3 DEFAULT: &D2 DESCRIPTION: &D0 means DTR is ignored &D1means modem returns to command mode. &D2 lets modem react to DTR normally. &D3 causes modem to reset to modem default parameters. COMMAND: $Dn VALUES: n = 0 or 1 DEFAULT: $D0 DESCRIPTION: $D0 disables DTR Dialing. $D1 enables DTR Dialing. COMMAND: %DFn VALUES: n = 0 or 1 DEFAULT: %DF0 DESCRIPTION: %DF0 means V.34 Line Probe Data in Graph Format. %DF1 means V.34 Line Probe Data in Table Format. COMMAND: %DPn VALUES: n = 0 or 1 DEFAULT: %DP0 DESCRIPTION: %DP0 means do not read Line Probe Information from DSP during handshaking. %DP1 means read Line Probe Information from DSP during handshaking. COMMAND: En VALUES: n = 0 or 1 DEFAULT: E1 DESCRIPTION: E0 means do not echo Command mode characters. E1 means do echo Command mode characters. COMMAND: $EBn VALUES: n = 0 or 1 DEFAULT: $EB0 DESCRIPTION: $EB0 enables 10 bit mode. $EB1 enables 11 bit mode. COMMAND: &En VALUES: n = 0 thru 15 DEFAULT: &E1, &E4, &E6, &E10, &E13, &E15 DESCRIPTION: &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. &E6 means Xon/Xoff not passed through. &E7 means Xon/Xoff passed through. &E8 means Enq/Ack pacing off. &E9 means Enq/Ack pacing on. &E10 means Normal Mode flow control off. &E11 means Normal Mode flow control on. &E12 means Pacing off. &E13 means Pacing on. &E14 means data compression disabled. &E15 means data compression enabled. COMMAND: %En VALUES: n=0 thru 5 DEFAULT: %E1 DESCRIPTION: %E0 = Modem Won't Escape. %E1 = +++ Method (default setting). %E2 = Break Method. %E3 = Either +++ or Break Method. %E4 = No "OK" Response to +++ %E5 = "OK" Response to +++ COMMAND: #Fn VALUES: n = 0 thru 2 DEFAULT: #F2 DESCRIPTION: #F0 means no fallback when on-line. #F1 means fallback from 28800 to 2400 bps when on-line (increments of 2400 bps). #F2 means fallback to 2400 bps from 28.8K bps/fall forward if line improves (increments of 2400 bps). COMMAND: &Fn VALUES: n = 0, 8 or 9 DEFAULT: &F8 DESCRIPTION: &F loads factory default values from ROM. &F8 reads factory default values when &F is issued. &F9 reads parameters stored in nonvolatile memory when &F is issued. COMMAND: $Fn VALUES: n = 0 or 1 DEFAULT: $F1 DESCRIPTION: $F0 means do not fall back to normal connect if CR received. $F1 means fall back to normal connect if CR received. COMMAND: &Gn VALUES: n = 0, 1 or 2 DEFAULT: &G0 DESCRIPTION: &G0 turns off CCITT guard tones. &G1 turns on CCITT 550 Hz guard tone. &G2 turns on CCITT 1800 Hz guard tone. (Not used Internationally or in the MT2834PCSK.) COMMAND: Hn VALUES: n = 0 or 1 DEFAULT: n/a DESCRIPTION: H0 means Hang Up (go on hook). H1 means Go Off Hook. COMMAND: $Hn VALUES: n = 1 thru 3 DEFAULT: Read Only Command DESCRIPTION: $H1 brings up Help Screen #1. $H2 brings up Help Screen #2. $H3 brings up Help Screen #3. COMMAND: In VALUES: n = 0,1, 2 or 5 DEFAULT: Read Only Command DESCRIPTION: I0 requests modem ID #. I1 requests firmware revision #. I2 for MTS internal use. I5 outputs DSP version. COMMAND: L VALUES: 5, 6, 7, 8, 9, 10 and 11 DEFAULT: Read Only Command DESCRIPTION: L5 lists all current operating parameters. L6 lists all current S-Register values. L7 lists additional parameters. L8 lists current on-line diagnostics. L9 displays Signal Strength Information. L10 displays Signal to Noise Ratio Information. L11 displays Noise Information. COMMAND: #Ln VALUES: n = 0 thru 3 DEFAULT: #L0 DESCRIPTION: #L0 means modems negotiate V.42 Mode. #L1 means MNP on and LAP-M off. #L2 means LAP-M on and MNP off. #L3 means no detection phase but go directly to LAP-M. COMMAND: $MBn VALUES: n = speed DEFAULT: $MB28800 bps DESCRIPTION: $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 $MB19200 selects 19200 bps on-line $MB28800 selects 28800 bps on-line COMMAND: &Mn VALUES: n = 0 or 1 DEFAULT: &M0 DESCRIPTION: &M0 selects Async when on-line. &M1 selects Sync when on-line. COMMAND: Nd VALUES: d = 0 thru 9 DEFAULT: n/a DESCRIPTION: Dial stored telephone number "d" (Do not include the letter D in this command.) COMMAND: NdNe VALUES: d = 0 thru 9; e = any other number 0 thru 9 DEFAULT: n/a DESCRIPTION: Number Linking. If first number dialed is busy, another stored number may be automatically dialed. In example, stored number d is dialed, and if busy, stored number e is dialed. COMMAND: O VALUES: n/a DEFAULT: n/a DESCRIPTION: Exit Command Mode and go into On-Line Mode. COMMAND: P VALUES: n/a DEFAULT: Tone Dial DESCRIPTION: Modem will pulse-dial numbers following the P. COMMAND: &Pn VALUES: n = 0 or 1 DEFAULT: &P0 DESCRIPTION: &P0 means 60-40 pulse ratio. &P1 means 67-33 pulse ratio. COMMAND: Qn VALUES: n = 0, 1 or 2 DEFAULT: Q0 DESCRIPTION: Q0 means Result Codes sent. Q1 means Result Codes will be suppressed (quiet). Q2 means Dumb Answer Mode. COMMAND: &Qn VALUES: n = 0 or 1 DEFAULT: &Q0 DESCRIPTION: &Q0 selects Multi-Tech command set. &Q1 selects AT command set. COMMAND: Rn VALUES: n = 0 or 1 DEFAULT: R0 DESCRIPTION: R0 means modem will not reverse modes. R1 means modem will reverse modes. COMMAND: &Rn VALUES: n = 0, 1 or 2 DEFAULT: &R1 DESCRIPTION: &R0 lets Clear to Send act normally. &R1 forces Clear to Send on. &R2 drops for 1 second on disconnect. COMMAND: $Rn VALUES: n = 0 or 1 DEFAULT: $R0 DESCRIPTION: $R0 means disconnect after 12 retransmits. $R1 means do not disconnect after 12 retransmits. COMMAND: &RFn VALUES: n = 0 or 1 DEFAULT: &RF1 DESCRIPTION: &RF0 selects CTS follows RTS. &RF1 selects CTS to act independently COMMAND: Sr=n VALUES: r = 0-11, 13, 15-17, 24-26, 29, 30, 32, 34, 36, 37, 48 DEFAULT: n/a DESCRIPTION: Sets value of S-Register "r" to value of "n", where "n" is entered in decimal format. COMMAND: Sr? VALUES: r = 0-11, 13, 15-17, 24-26, 29, 30, 32, 34, 36, 37, 48 DEFAULT: n/a DESCRIPTION: Reads value of S-Register "r" and displays value in 3-digit decimal format. COMMAND: $SBn VALUES: n = speed DEFAULT: $SB115200 bps DESCRIPTION: $SB300 selects 300 bps at serial port. $SB1200 selects 1200 bps at serial port. $SB2400 selects 2400 bps at serial port. $SB4800 selects 4800 bps at serial port. $SB9600 selects 9600 bps at serial port. $SB19200 selects 19,200 bps at serial port. $SB38400 selects 38,400 bps at serial port $SB57600 selects 57600 bps at serial port. $SB115200 selects 115200 bps at serial port. COMMAND: &SFn VALUES: n = 0 or 1 DEFAULT: &SF0 DESCRIPTION: &SF0 selects DSR follows CD. &SF1 selects DSR independent. COMMAND: &Sn VALUES: n = 0, 1 or 2 DEFAULT: &S1 DESCRIPTION: &S0 forces Data Set Ready On. &S1 lets Data Set Ready act normally. &S2 Data Set Ready drop is regulated by S24 on disconnect. COMMAND: T VALUES: n/a DEFAULT: Tone Dial DESCRIPTION: Modem will tone-dial numbers following the T. COMMAND: &Tn VALUES: n = 4 or 5 DEFAULT: &T5 DESCRIPTION: &T4 means Enable Response to Request for Remote Digital Loopback. &T5 means Disable Response to Request for Remote Digital Loopback. COMMAND: #Tn VALUES: n = 0 or 1 DEFAULT: #T1 DESCRIPTION: #T0 turns off Trellis Coded Modulation #T1 turns on Trellis Coded Modulation COMMAND: Un VALUES: n = 0, 1, 2, or 3 DEFAULT: n/a DESCRIPTION: U0 places modem in Analog Loop Originate Mode. U1 places modem in Analog Loop Answer Mode. U2 places modem in Remote Digital Loopback test mode. U3 places modem in Local Digital Loopback Test Mode. COMMAND: Vn VALUES: n = 0 or 1 DEFAULT: V1 DESCRIPTION: V0 means Result Codes sent as digits(terse response). V1 means Result Codes sent as words (verbose response). COMMAND: #Vn VALUES: n = 0 or 1 DEFAULT: #V0 DESCRIPTION: User can bypass V.32terbo handshaking process. #V0 means V.32terbo enabled in answer mode. #V1 means V.32terbo disabled in answer mode. COMMAND: W VALUES: n/a DEFAULT: n/a DESCRIPTION: Wait for new dial-tone. COMMAND: &Wn VALUES: n = 0 or 1 DEFAULT: &W1 DESCRIPTION: &W0 causes modem to store its current parameters in non- volatile RAM, and modem will load these for future ses- sions instead of reading factory ROM defaults, unless &F command used. &W1 causes modem to not store parameters. COMMAND: Xn VALUES: n = 0, 1, 2, 3 or 4 DEFAULT: X0 DESCRIPTION: X0 selects Basic Result Codes (w/o CONNECT 1200,CONNECT 2400). X1 selects Extended Result Codes (w/CONNECT 1200, CONNECT 2400). X2 selects Standard AT Command set with NO DIAL TONE. X3 selects Standard AT Command set with BUSY. X4 selects Standard AT Command set with NO DIAL TONE and BUSY. COMMAND: #Xn VALUES: n = 0 or 1 DEFAULT: #X0 DESCRIPTION: #X0 selects single XOFF character sent until XON level returns. #X1 selects multiple XOFF characters after buffer level is full. COMMAND: Yn VALUES: n = 0 or 1 DEFAULT: Y0 DESCRIPTION: Y0 disables sending or responding to long space "break". Y1 enables sending or responding to long space "breaks". COMMAND: Z VALUES: n/a DEFAULT: n/a DESCRIPTION: All configuration parameters are reset to default values. COMMAND: , (Comma) VALUES: n/a DEFAULT: n/a DESCRIPTION: Causes pause during dialing. COMMAND: ;(Semi-Colon) VALUES: n/a DEFAULT: n/a DESCRIPTION: Causes return to Command Mode after dialing. COMMAND: ! (Exclamation) VALUES: n/a DEFAULT: n/a DESCRIPTION: Causes modem to flash On-Hook. COMMAND: @ VALUES: n/a DEFAULT: n/a DESCRIPTION: Causes modem to wait for ringback, then 5 seconds of silence before processing next part of command. COMMAND: +++AT VALUES: n/a DEFAULT: n/a DESCRIPTION: In-band Escape Sequence. Places modem in Command mode while still remaining On- Line. Enter +++ followed by the letters A and T, up to ten command characters, and a RETURN. COMMAND: BREAK AT VALUES: n/a DEFAULT: n/a DESCRIPTION: Out-of-band Escape Sequence. Places modem in Command mode while still remaining On- Line. Not preceded by AT. Enter a BREAK signal, followed by the letters A and T, up to sixty command characters, and hit RETURN. 4.1.1 Callback Security/Remote Configuration Commands COMMAND: #DBn VALUES: n= 0, 1, or 2 DEFAULT: #DB0 DESCRIPTION: #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 activates remote password security. COMMAND: #CBNyyxxxxxx VALUES: n/a DEFAULT: n/a DESCRIPTION: Callback password with xxxxxx being callback password and yy being the memory location. Callback password xxxxxx must start with a non-numeric character and upper/lower case sensitive. Callback password xxxxxx must be a minimum of 6 and maximum of 10 characters. yy memory locations are from 0 to 29. Must T (tone) dialing in string. COMMAND: + - Dxxxxxx???Nxx VALUES: n/a DEFAULT: n/a DESCRIPTION: Callback Phone Numbers xxxxxx with the + preceding the phone number indicating the callback modem phone number for the corresponding password at the same memory location. The (-) preceding the phone number enables direct entry when the caller uses the correct password without the callback modem having to return the call. The ??? entry at the end of the phone number represents an extension added to the main phone number. The Nxx is the memory location of the callback phone number and password. COMMAND: #Pn VALUES: n= 0, 1, or 2 DEFAULT: #P0 DESCRIPTION: Parity of the prompt messages sent by the callback modem. #P0 is no parity #P1 is odd parity #P2 is even parity COMMAND: #RCBNxx VALUES: n/a DEFAULT: n/a DESCRIPTION: Erases the callback password stored at memory location xx. Memory locations are 0 to 29. COMMAND: #RDNxx VALUES: n/a DEFAULT: n/a DESCRIPTION: Erases the callback phone number stored at memory loca- tion xx. Memory locations are 0 to 29. Password Commands COMMAND: #Ixxxxxxxxxx VALUES: n/a DEFAULT: #IMULTITECH DESCRIPTION: Login Password is any keyboard characters (x) (upper/lower case sensitive), minimum 6 and maximum 10 characters. The default Login Password is MULTI-TECH. COMMAND: #Syyyyyyyyyy VALUES: n/a DEFAULT: #SMODEMSETUP DESCRIPTION: Set-up Password is any keyboard characters (y) (upper/ lower case sensitive), minimum 6 and maximum 10 charac- ters. The default Set-up Password is MODEMSETUP. 4.1.2 V.25bis Commands COMMAND: $Vn VALUES: n= 0, 1, 2, 5, or 6 DEFAULT: $V0 DESCRIPTION: $V0 returns modem to AT command mode when in V.25bis mode. $V1 enables V.25bis mode of operation. $V2 allows modem to receive one V.25bis command while in AT command mode without leaving AT command mode. $V5 DSR follows DTR in V.25bis mode. $V6 DSR does not follow DTR in V.25bis mode. COMMAND: CLAmm VALUES: n/a DEFAULT: n/a DESCRIPTION: Clears the phone number memory location mm. Phone numbers are stored in memory locations 00 to 19. COMMAND: CSPs VALUES: n/a DEFAULT: n/a DESCRIPTION: The CSP command will change the serial baud rate of your modem by entering CSPsssss where sssss can equal: CSP0300 - 300 bps CSP1200 - 1200 bps CSP2400 - 2400 bps CSP4800 - 4800 bps CSP9600 - 9600 bps CSP19200 - 19200 bps CSP38400 - 38400 bps CSP57600 - 57600 bps CSP115200 - 115200 bps COMMAND: CRNdd VALUES: n/a DEFAULT: n/a DESCRIPTION: Dials phone number dd where dd can be up to 20 characters (0 through 9, *, #, P, T and :). Phone number is checked against the Delayed and Forbidden Number lists before dialed. COMMAND: CRNdd;nn VALUES: n/a DEFAULT: n/a DESCRIPTION: Dials dd same as CRN Command and ignores nn identifica- tion string. COMMAND: CRSmm VALUES: n/a DEFAULT: n/a DESCRIPTION: Dial stored phone number at memory location mm. Phone numbers are stored in memory locations 00 to 19. Phone number is checked against the Delayed and Forbidden Number lists before dialed. COMMAND: PRNmm;dd VALUES: n/a DEFAULT: n/a DESCRIPTION: Store phone number in memory location mm followed by a semicolon (;) and the phone number dd in which you wish to store. COMMAND: RLN VALUES: n/a DEFAULT: n/a DESCRIPTION: Displays all phone numbers stored in memory. COMMAND: RLD VALUES: n/a DEFAULT: n/a DESCRIPTION: Displays the delayed phone numbers stored in memory. The delayed phone numbers listing can contain up to eight phone numbers. COMMAND: RLF VALUES: n/a DEFAULT: n/a DESCRIPTION: Displays the forbidden phone numbers stored in memory. This listing can be up to eight phone numbers. COMMAND: DIC or CIC VALUES: n/a DEFAULT: n/a DESCRIPTION: The disregard or connect to incoming calls commands are used for auto-answer operations. DIC stops the modem from answering incoming calls. CIC causes the modem to answer incoming calls. 4.2 S-Registers 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 a decimal response to the message "ENTER THE NEW VALUE IN DECIMAL FORMAT". To read an S-Register value, enter the letter S followed by the S-Register number and a question mark (?), then hit RETURN. To verify that the S- Register value was entered correctly, enter for example, ATS8? and hit RETURN. You should receive a response of the assigned value given to that S-Register. S0 Number of Rings Until Modem Answers Unit: 1 ring Range: 0-255 Default: 1 Description: Sets the number of rings before the modem answers. S1 Rings Which Have Occurred Unit: 1 ring Range: 0-255 Default: 0 Description: Counts the number of rings that have occurred. S2 Escape Code Character Unit: ASCII Character Range: 0-127 Default: 43 (+ sign) Description: Defines the escape code character. S3 Return Character Unit: ASCII Character Range: 0-127 Default: 13 Description: Defines the character recognized as Carriage Return (RETURN) or "Enter". S4 Line Feed Character Unit: ASCII Character Range: 0-127 Default: 10 Description: Defines the character recognized as LINE FEED. S5 Backspace Character Unit: ASCII Character Range: 0-127 Default: 8 Description: Defines the character recognized as BACKSPACE. S6 Wait Time for Dial Tone Unit: 1 second Range: 2-255, 4-255**, 4-7*** Default: 2, 4**, 4*** Description: Sets the time the modem waits after the RETURN key is pressed before executing a dial command. * Value for International and DOC units ** Value for International Units only *** Value for BABT models only S7 Time for Carrier (Abort Timer) Unit: 1 second Range: 1-255, 1-45*, 1-55*** Default: 45, 55*** Description: Defines the Abort Timer (lack of carrier) delay time. S8 Pause Time for Comma Unit: 1 second Range: 0-255, 4-255**, 4-7*** Default: 2, 4**, 4*** Description: Sets the length of the pause caused by a comma inserted in a dialing command. S9 Carrier Detect Response Time Unit: 100 mSec. Range: 1-255 Default: 6 Description: Sets the time delay for when the modem first detects a valid incoming carrier signal and when the modem turns on its Carrier Detect circuit. S10 Carrier Loss Disconnect Delay Time Unit: 100 mSec. Range: 0-255 Default: 7 Description: Sets the time a carrier signal must be lost before the modem disconnects. S11 Tone Dialing: Tone Spacing and Duration Unit: 1 mSec. Range: 1-255, 80-255*,80-255*** Default: 70, 80*,80*** Description: Sets the time duration of spacing between tone in tone-dialing. S13 Remote Configuration Escape Character Unit: ASCII Character Range: 0-127 Default: 37 (% sign) Description: Defines the remote configuration escape character. S15 Callback Time Delay Unit: Seconds Range: 10-255 Default: 20 Description: S15 defines the time delay for Callback attempts after initial passwords have been exchanged between modems. S16 Callback Attempts Unit: 1 Attempt Range: 1-255, 1-2*** Default: 4, 2*** Description: S16 Callback defines the number of attempts allowed after initial passwords have been exchanged between modems. * Value for International and DOC units ** Value for International Units only *** Value for BABT models only S17 Changing Break Time Unit: 10 mSec. Range: 0-2.5 sec Default: 250 Description: S17 defines the break time (space) to local PC. S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD Unit: 50 mSec. Range: 0-255 Default: 20 Description: Defines DSR/CTS/CD dropout time. The default of 20 equals one second. S25 DTR Dropout Time Unit: 100 mSec. Range: 0, 1 through 255 Default: 0 Description: Defines DTR dropout time. 0 default equals 50ms. S26 Failed Password Attempts Unit: 1 failed attempt Range: 0-255 Default: 0 Description:Counts the number of times there has been a failed password attempt. S29 Local Inactivity Timer Unit: minutes Range: 1-255 Default: 20 Description: Defines the amount of idle time that can elapse between AT commands after the SETUP password has been entered. S30 Inactivity Timer Unit: 1 minute Range: 0-255 Default: 0 Description: Inactivity timer used to disconnect the modem. S32 Time Elapse for Escape Sequence Unit: 1 second Range: 0-255 Default: 20 Description: Sets the duration in which modem waits for a to be entered during escape sequence execution. S34 Buffer Length of Command Mode...After On-line Escape Sequence Unit: ASCII Character Range: 0-60 Default: 10 Description: Sets buffer length of command mode after on-line escape sequence. S36 Time Between DTR Inactive and Modem Off-Hook Unit: 1 Second Range: 0-255 seconds Default: 0 Description: Sets the time between DTR inactive (low) and the modem going off-hook. The DTR Busy-out feature is disabled with S36=0. S37 Time Between DTR Active and Modem On-Hook Unit: 1 Second Range: 0-255 seconds Default: 5 Description: Sets the time between DTR being active and the modem going on-hook (not busy). S48 Program V.34 Connect Speeds Unit: N/A Range: 28, 26, 21,19,16,14,12, 96 and 48 Default: 0 Description: Defines which speed modem connects within V.34 mode scope (e.g., S48 = 21 means maximum connect speed is 21.6K). This register compensates for line conditions that will not support higher V.34 speeds (e.g., 28K, 26.4K, 24K...). The modem default is a value of 0, which indicates a connection attempt of 28.8K. 4.3 Result Codes The MT2834PCS 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. AT&Q0 selects Multi-Tech responses with Reliable/Compression modifiers. The terse result code for CONNECT 2400 is 9. AT&Q1 selects Standard AT command set responses. The terse result code for CONNECT 2400 is 10. The following tables list result codes generated by the &Q command. Table 4-1 &Q0 "Multi-Tech" Result Codes TERSE VERBOSE 0 OK 1 CONNECT 2 RING 3 NO CARRIER 4 ERROR 5 * CONNECT 1200 6 NO DIALTONE 7 BUSY 8 NO ANSWER 9 * CONNECT 2400 11 * CONNECT 4800 12 * CONNECT 9600 13 * CONNECT 14400 19 * CONNECT 19200 21 * CONNECT 21600 24 * CONNECT 24000 26 * CONNECT 26400 28 * CONNECT 28800 * With error correction on, RELIABLE (or R) is added to these result codes. With data compression on, COMPRESSION (or C) is added. Table 4-2 &Q1 "Standard AT" Result Codes TERSE VERBOSE 0 OK 1 CONNECT 2 RING 3 NO CARRIER 4 ERROR 5 CONNECT 1200 6 NO DIAL TONE 7 BUSY 8 NO ANSWER 10 CONNECT 2400 11 CONNECT 4800 12 CONNECT 9600 13 CONNECT 14400 19 CONNECT 19200 21 CONNECT 21600 24 CONNECT 24000 26 CONNECT 26400 28 CONNECT 28800 *Error Correction/Data Compression modifiers are not displayed with Standard AT Result Codes. 4.3.1 AT Commands and S-Register Summary The vast majority of installations are similar, with the MT2834PCS being used to dial up a remote installation where the call is automatically answered. Your MT2834PCS has a default configuration to dial another 28,800 bps modem that support error correction, data compression and flow control. If the answering modem is not compatible, the MT2834PCS can match protocols, provided the protocols are industry standard (i.e., ITU-T, AT&T or Bell) and not proprietary. The &W command, used in conjunction with specific other AT commands and S-Registers, can reconfigure the MT2834PCS to conform to a specific application. The MT2834PCS can store its configuration parameters and S-Register values in its nonvolatile memory. The command AT&W0 (or AT&W) causes the modem to store its current parameters in its nonvolatile RAM. The command also sets the modem upon power up, or when it is reset with an ATZ command, the modem reads all its configuration and S-Register parameters from RAM, and not from the factory settings in ROM (note you may recall factory installed defaults by entering AT&F8&W0). The &W command changes the configuration parameters stored in RAM that you specifically intend to alter. All other default parameters remain unchanged. The AT&W1 command sets the modem so that it does not store its parameters in RAM, and on power up or when an ATZ command is issued, parameters are read from the factory default settings in ROM. Before using the &W command, you may want to view the modem's current operating parameters. Use the ATL5, ATL6 and ATL7 commands to display the current modem configuration. 5.1 Introduction Each time you power up the MT2834PCS, it performs an automatic self- test to ensure proper operation. The MT2834PCS also has three diagnostic test features: Local Analog Loopback, Digital Loopback (remote/automatic) and Digital Loopback (local/manual). A loopback test involves entering data from your PC and looping that data through the circuits of your modem and/or a remote modem. When the loop has been completed, the original data entered should match the data received back on your PCs monitor after the test. The Local Analog Loopback Test allows you to verify that the modem's transmitter and receiver circuits are functioning properly. The Digital Loopback Test (local/manual) allows you to verify that the remote computer or terminal, the remote modem, serial ports, the telephone line and the local modem are functioning properly. The Digital Loopback Test (remote/automatic) allows you to verify that the local computer or terminal, the two modems and the transmission line between them are functioning properly. In asynchronous mode, upon completion of testing, enter either Escape Sequence, +++AT or AT. Note: All loopback tests will operate at all speeds except 300 bps. 5.2 Local Analog Loopback Test/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 required. The test procedure is as follows: 1. Connect the modem to your computer. With your communication software, set the desired baud rate. 2. Type ATU0 (or ATU) and hit ENTER. This places your modem in Analog Loopback mode, in the Originate mode. The modem is now out of the Command mode and in a pseudo On-Line mode. 3. Once you receive a connect message (if responses are enabled), enter data from your keyboard. For this test, typing multiple upper case "U" characters is a good way to send an alternating test pattern of ones and zeros. 4. For a more complete test, you should also test the modem in Answer mode. To do this, you must "escape" from Originate mode by entering an Escape Sequence (+++AT or AT) . Then type ATU1 and hit ENTER to place the modem in Analog Loopback mode, in the Answer mode. Then repeat step 3. 5. When testing is completed, you may exit Answer mode by entering an Escape Sequence (+++AT or AT), which returns the modem to Command mode. 6. Your modem passes this test if the data entered from your keyboard are the same as the data received on your monitor. If different data is appearing on your monitor, your modem is probably causing the problem, although it could also be your computer. If your modem passes this test, but you are receiving errors while On-line, the remote modem or the phone line could be at fault. 5.3 Digital Loopback Test/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 MT2834PCS. The Digital Loopback Test is an on-line test that loops data sent from one modem across the phone line to another modem, then back to the first modem. There are two ways to put a modem into Digital Loopback mode. 1. Locally or Manually, described here in section 5.3. 2. Remotely or Automatically, see section 5.4. Note: The Digital Loopback Tests can only be used with the modem in Normal mode (error correction off). In this test the local modem is placed in Digital Loopback mode. Data is entered and transmitted from the remote modem (which is not in digital loopback mode), sent across the phone line to the local modem and looped back to the remote modem. The test procedure is as follows: 1. Go into Terminal mode. Type AT and hit ENTER; you should get an OK message. 2. Dial the remote modem by entering the Dial command and the phone number, to establish On-line mode. 3. Type the Escape Sequence (+++AT or AT) which brings your modem into Command mode, while still maintaining the pseudo On-line mode with the remote modem. 4. Type ATU3 from the local PC and hit ENTER. Once you receive an OK message from your modem (if responses are enabled), the local modem is placed in Digital Loopback mode. 5. Data is typed from the remote keyboard. For this test, typing multiple upper case "U" characters is a good way to send an alternating test pattern of ones and zeros. The data received by the local modem will enter its analog receiver, be converted to digital data, be reconverted into analog, and then looped through its transmitter back to the remotemodem. Your modem passes this test if the data entered from the remote keyboard is the same as the data received on the remote monitor. 6. When testing is complete, you may end the test by typing an Escape Sequence (+++AT or AT) to bring your modem into 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 AT0 and hit ENTER. If you wish to terminate the call, type ATH and hit ENTER to hang up. 5.4 Digital Loopback Test/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 MT2834PCS. With the MT2834PCS, this ability to respond is controlled by the &T command. AT&T4 enables the response to Digital Loopback Test (remote/automatic). AT&T5 disables the response. The modem defaults to disable on power up, so this must be changed on the remote modem before the modem will respond to a request for the Digital Loopback Test (remote/automatic). Initiate the Digital Loopback Test (remote/automatic) with the ATU2 command which automatically places the remote modem in digital loopback mode. Data from your computer or terminal are transmitted through your modem, and over the phone line to the remote modem, where they are then looped back to your modem. See Figure 5-3. The test procedure is as follows: 1. Go into Terminal mode. Type AT and hit ENTER; you should get an OK message. 2. Dial the remote modem by entering the Dial command and the phone number, to establish On-line mode. Note: The &T4 command must be set on the remote modem to run this test. 3. Type the Escape Sequence (+++AT or AT) which brings your modem into Command mode, while still maintaining the connection with the remote modem. 4. Type ATU2 and hit ENTER. The local modem responds to this command by transmitting an unscrambled marking signal, which causes the remote modem to place itself in Digital Loopback mode. Then the local modem exits Command mode and enters pseudo On-line mode. 5. Type data from your keyboard. For this test, typing multiple upper case "U" characters is a good way to send an alternating test pattern of ones and zeros. The data received by the remote modem will enter its analog receiver, be converted to digital data, be reconverted into analog, and then looped through its transmitter back to the local modem. Your modem passes this test if the data entered from the local keyboard is the same as the data received on your monitor. 5.5 Synchronous Mode Testing 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 2 for DIP Switch information.) The test procedures for Synchronous mode are different from those for Asynchronous mode. In Synchronous mode, you cannot access the modem's AT commands. With DIP Switch #9, you can perform either the Digital Loopback Test (remote/automatic) or the Digital Loopback Test (local/manual) in Synchronous mode, as described in the following sections. There is also a Local Analog Loopback Test, documented in section 5.6. 5.6 Local Analog Loopback Test (Synchronous Mode) This test diagnoses the connection between your MT2834PCS and your computer or terminal. In Local Analog Loopback Test mode, data entered at the local computer or terminal are sent through the local modem's transmit and receive circuits (much like entering an ATU or ATU1 command in Asynchronous mode). You then compare the test characters on your monitor with the characters you typed. If the characters don't match, check your computer's COM port setting, then verify your communication software's configuration. To initiate the Local Analog Loopback Test, with the modem in Synchronous mode: 1. Enter AT&M1U. This first switches your modem from asynchronous to synchronous mode, and places it into the Analog Loopback/Originate mode. The modem is now out of the Command mode and in the pseudo On-Line mode. 2. Once you receive a connect message (if responses are enabled), enter data from your keyboard. For this test, typing multiple upper case "U" characters is a good way to send an alternating test pattern of ones and zeros. 3. For a more complete test, you should also test the modem in Answer mode. To do this, Type the Escape Sequence (+++AT or AT) which brings your modem into Command mode, while still maintaining the connection. Then type AT&M1U1 and hit ENTER to place the modem in Analog Loopback mode, in the Answer mode. Then repeat step 2. 5.7 Digital Loopback Test (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/manual) mode, data passed from the remote modem's transmit circuit are looped back from the local modem and are received at the remote modem's receive circuit. First make certain that you are set up for Synchronous operation by placing DIP-Switch #12 in the UP position. To initiate the Digital Loopback Test (local/manual), DIP-Switch #9 must be in the UP position, and the Answer/Orignate switch (front of the modem) must be toggled to the UP position. Once you receive an OK message from your modem (if responses are enabled), the local modem is placed in Digital Loopback mode. To exit the Digital Loopback Test (local/manual), toggle the Answ/Orig switch to the Answer position (UP). 5.8 Digital Loopback Test (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). This lets you test the local and remote modem's transmit and receive circuits, as well as your computer's serial COM port and the phone lines. If the test results in a mismatch of entered/received data, the Local Analog Loopback Test should be performed on both the remote and local modems. If that test is successful, the problem may be the phone lines. First make certain that you are set up for Synchronous operation by placing DIP-Switch #12 in the UP position. To initiate the Digital Loopback Test (remote/automatic), DIP-Switch #9 must be in the DOWN position, and the Answer/Orignate switch (front of the modem) must be toggled to the UP position. Once you receive an OK message from your modem (if responses are enabled), the local modem is placed in Digital Loopback mode. To exit the Digital Loopback Test (remote/automatic), toggle the Answ/Orig switch to the Answer position (UP). Appendix A 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 requested, this information must be provided to the telephone company. 2. As indicated below, the suitable jack (Universal Service Order Code connecting arrangement) for this equipment is shown. If applicable, the facility interface codes (FIC) and service order codes (SOC) are shown. An FCC-compliant telephone cord and modular plug is provided with this equipment. This equipment is designed to be connected to the telephone network or premises wiring using a compatible modular jack which is Part 68 compliant. See installation instructions for details. 3. The ringer equivalence number (REN) is used to determine the quantity of devices which may be connected to the telephone line. Excessive REN's on the telephone line may result in the devices not ringing in response to an incoming call. In most, but not all areas, the sum of the REN's should not exceed five (5.0). To be certain of the number of devices that may be connected to the line, as determined by the total REN's, contact the telephone company to determine the maximum REN for the calling area. 4. If this equipment causes harm to the telephone network, the telephone company will notify you in advance that temporary discontinuance of service may be required. But if advance notice isn't practical, the telephone company will notify the customer as soon as possible. Also, you will be advised of your right to file a complaint with the FCC if you believe it is necessary. 5. The telephone company may make changes in its facilities, equipment, operations, or procedures that could affect the operation of the equipment. If this happens, the telephone company will provide advance notice in order for you to make necessary modifications in order to maintain uninterrupted service. 6. If trouble is experienced with this equipment (the model of which is indicated below) please contact Multi-Tech Systems, Inc. at the address shown below for details of how to have repairs made. If the equipment is causing harm to the telephone network, the telephone company may request you remove the equipment from the network until the problem is resolved. 7. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees. Unauthorized repairs void registration and warranty. 8. This equipment cannot be used on public coin service provided by the telephone company. Connection to Party Line Service is subject to state tariffs. (Contact the state public utility commission, public service commission or corporation commission for information.) 9. If so required, this equipment is hearing-aid compatible. Manufacturer: Multi-Tech Systems, Inc. Model Number: MT2834PCS FCC Registration #: AU7USA-20673-MM-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 Voice (612) 785-3500/ FAX (612) 785-9874 Canadian Limitations Notice Notice: The Canadian Department of Communications label identifies certificated equipment. This certification means that the equipment meets certain telecommunications network protective, operational and safety requirements. The Department does not guarantee the equipment will operate to the user's satisfaction. Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment must also be installed using an acceptable method of connection. In some cases, the company's inside wiring associated with a single line individual service may be extended by means of a certified connector assembly (telephone extension cord). The customer should be aware that compliance with the above conditions may not prevent degradation of service in some situations. Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment; or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment. Users should ensure for their own protection that the electrical ground connections of the power utility, telephone lines and internal metallic water pipe system, if present, are connected together. This precaution may be particularly important in rural areas. The Load Number (LN) assigned to each terminal device denotes the percentage of the total load to be connected to a telephone loop which is used by the device, to prevent overloading. The termination on a loop may consist of any combination of devices subject only to the requirement that the total of the Load Numbers of all the devices does not exceed 100. The Load Number for this product is 4. Caution: Users should not attempt to make such connections themselves, but should contact the appropriate electric inspection authority, or electrician, as appropriate. This digital apparatus does not exceed the Class A limits for radio noise for digital apparatus set out in Department of Communications. 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 for use" with ports marked or not so marked may produce hazardous conditions on the network. Advice should be obtained from a competent engineer before such a connection is made.Connection of power supply: This apparatus is intended for use when powered by Multi-Tech #01006370. Use of other power supply units will invalidate any approval given to this product if as a result it ceases to comply with BS6301:1989. European Low Voltage Directive When correctly installed and maintained, the modem will present no hazard to the user. When correctly installed the modem will be connected to the PSTN or a PW and to a Data Terminal Equipment (DTE), whose modem connections comply with CCITT recommendation V28. The DTE connections are therefore taken to be safe voltages (less than ñ 30 volts). Compliance with BS6305 Clause 6.2, BS6320 Clause 7.2, and BABT/SITS/82/005S/D a. The modem is suitable for connection to the Public Switched Telephone Network (PSTN) provided by British Telecommunications pic or Kingston Communications (Hull) pic. Circuit supply by British Communications, Mercury Communication, or Hull City Council. Only direct exchange lines may be used, not shared service. b. The modem is suitable for household, office, and similar general indoor use. It is not suitable for use as an extension to a payphone. c. BT lines supplied must support either loop disconnect or multifrequency tone signalling. d. REN (Ringer Equivalence Number). The REN value of a unit is calculated from 3/n where n is the total number of units which can be connected in parallel which will still cause the standard bell (as defined in BS6305 Appendix D) to ring. REN values of less than 0.3 cannot be assigned. REN = 1 If a telephone or other device is connected in parallel with the modem, the combined REN must not exceed 4. A BT supplied telephone may be assumed to have REN of 1.0 unless otherwise noted. The approval of this modem for connection to the British Telecom public switched telephone network is INVALIDATED if the apparatus is subject to any modification in any material way not authorized by BABT or if it is used with or connected to: i. internal software that has not been formally accepted BABT. ii. external control software or external control apparatus which cause the operation of the modem associated call set-up equipment to contravene the requirements of the standard set out in BABT/SITS/82/005S/D. All 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. Compliance with BS6789: Section 3.1 and Part 2 a. The modem is not capable of allowing Auto Call using '999' or other PABX emergency numbers. b. Modes other than modes 1, 2, or 3 should not be used on the BT PSTN. This modem is a mode 1 device. c. Users are advised to check the numbers entered during the Auto Call set up phase prior to dialing. d. The user should not issue any sequence of commands to the modem which would cause the modem to exceed the maximum allowable pause of 8 seconds from the time the modem goes off hook until dialing begins. e. For correct operation of the call progress monitor, the power has to be properly connected and switched on. Compliance with BS6328 Part 1 and BABT/SITS/82/01/C (Use on Private Circuits) a. The modem is not suitable for use on circuits with British Telecommunications signaling at a normal frequency of 2280 Hz. b. The modem does not require signaling or otherwise employ the frequency range dc to 200 Hz. c. The modem may be connected directly to a point-to-point two- wire or four-wire Private Circuit. d. The modem does not require dc from the Private Circuit for correct operation. The modem may be damaged if connected, in a private circuit mode, to a circuit supplying dc current (the maximum permissible direct current is zero amps). e. The approval of this modem for connection to British Telecom Private Speech band circuits is INVALIDATED if the apparatus is subjected to any modification in any material way not authorized by BABT or if it is used with, or connected to: i) internal software that has not been formally accepted by BABT. ii) external control software or external control apparatus which cause the operation of the modem or associated call set-up equipment to contravene the requirements of the standard set out in BABT/SITS/82/01/C. All apparatus connected to this modem and thereby connected directly or indirectly to British Telecom Private Speechboard circuits must be approved apparatus as defined in Section 16 of the British Telecommunications Act 1981. Compliance with DTI 83/009 a. The apparatus is only approved for compatible PBXs. Consult the supplier for a up-to-date list of compatible PBXs. b. There is no guarantee of correct working in all circumstances. Any difficulties should be referred to Multi-Tech Systems. c. If sockets are required for connection to the PBX, use the BT post card only if BT owns the wiring to the PBX. This apparatus has been approved for the use of the following facilities: * Auto-calling * Loop disconnect and MF dialing * Phone number storage and retrieval by a predetermined code * Operation in the absence of proceed indication * Automatic storage of last number dialed * Tone detection-busy * Auto clear from the originating end * DTR dialing * Modem * PBX timed break register recall * Digital Simultaneous Voice Data Mode ("DSVD") Any other usage will invalidate the approval of the apparatus if, as a result, it then ceases to comply with the standards against which approval was granted. Appendix B Technical Specifications Your MT2834PCS meets the following specifications: Tradename MultiModemPCS Model Number MT2834PCS, MT2834PCS/ISI, MT2834PCSK, MT2834PCSK/ISI, MT2834PCSI (International) Data Rates (bps) 28,800, 26,400, 24,000, 21,600, 19,200, 16,800, 14,400, 12,000, 9600, 4800, 2400, 1200, 0-300 Fax Rates (bps) 14,400, 9600, 4800 Data Format Serial, binary, asynchronous at 0-300, 1200, 2400, 4800 , 9600, 14,400, 16,800,19,200, 21,600, 24,000, 26,400, 28,800 bps; synchronous at 1200, 2400, 4800 9600,14,400, 16,800,19,200, 21,600, 24,000, 26,400, 28,800 bps Data Compatibility ITU-T V.34, CCITT V.42bis, V.42, AT&T V.32terbo, CCITT V.32bis, V.32, V.21*,V.22bis, V.22, V.23*, Bell 212A and 103/113 (*International models) Fax Compatibility CCITT V.17, Group 3, V.29, V.27ter and EIA TR-29 Class 2 Error Correction/ V.42 (LAP-M or MNP 3 & 4), Data Compression V.42bis, (4:1 throughput), MNP 5 (2:1 throughput) Speed Conversion Serial port data rates adjustable to 300, 1200, 2400, 4800, 9600, 19,200, 38,400, 57,600 and 115,200 bps Flow Control Xon/Xoff, Hardware RTS/CTS, ENQ/ACK, Multi- Tech Supervisory Protocol (MSP) Mode of Operation Digital Simultaneous Voice Data (DSVD), Fax On-line modes, and "AT" , "AT" Style or V.25bis Command modes -- Full duplex over both dial-up lines and 2-wire leased lines Intelligent Features Automatic or manual dialing, Automatic or manual answer, Microprocessor-controlled, remote configuration, EIA extended Automode, adaptive line probing, automatic symbol rate and carrier frquency during start-up, retrain and rate renegotiation, Autodial, Redial, Repeat dial, Dial linking, Tone dial, Dial pauses, Call status display, Auto-parity and data rate selection, Keyboard-controlled modem options, Non-volatile memory and on-screen displays for modem option parameters and up to ten telephone numbers/command lines of up to 60 digits each, TalkAnytime allows users to establish Digital Simultaneous Voice Data Link anytime the telephone handset is picked up, Help menus Command Buffer 60 characters Data Modulation Trellis Coded Modulation (TCM) at 28,800, 26,400, 24,000, 21,600, 19,200, 16,800, 14,400, 12,000 and 9600 bps; Quadrature Amplitude Modulation (QAM) at 9600 (non-trellis), 4800 and 2400 bps, PSK at 1200 bps, FSK at 300 bps Fax Modulation V.17 TCM at 14400, 12000, 9600, and 7200 bps V.29 QAM at 9600 and 7200 bps V.27ter DPSK at 4800 and 2400 bps V.21CH2 FSK at 300 bps (Half Duplex) Carrier Frequencies Data Carrier Frequencies 1800 Hz V.34/V.32/V.32bis/V.32terbo 28.8K/26.4K/24K/21.6K/19.2K/16.8K/14.4K/12K/9.6K/ 4.8K Carrier Frequencies Transmit Originate: 1200 Hz 2400 & 1200 bps Transmit Answer: 2400 Hz (V.22bis/V.22 or Receive Originate: 2400 Hz Bell 212A Standard) Receive Answer: 1200 Hz Carrier Frequencies, 1270 Hz Mark, 1070 Hz Space for 300 bps Transmit Originate (Bell Standard) 2225 Hz Mark, 2025 Hz Space for Receive Originate 2225 Hz Mark, 2025 Hz Space for Transmit Answer 1270 Hz Mark, 1070 Hz Space for Receive Answer Carrier Frequencies 980 Hz Mark, 1180 Hz Space for V.21 Transmit Originate 1650 Hz Mark, 1850 Hz Space for Transmit Answer 1650 Hz Mark, 1850 Hz Space for Receive Originate 980 Hz Mark, 1180 Hz Space for Receive Answer V.23 390 Hz Mark, 450 Hz Space for Transmit Originate 1300 Hz Mark, 2100 Hz Space for Transmit Answer 1300 Hz Mark, 2100 Hz Space for Receive Originate 390 Hz Mark, 450 Hz Space for Receive Answer Carrier Frequencies Fax V.21 CH2 Transmit Originate: 1650 Hz Mark, 1850 Hz Space (Half Duplex) Transmit Answer: 1650 Hz Mark, 1850 Hz Space V.27ter Originate/Answer: 1800 Hz V.29 QAM Originate/Answer: 1800 Hz V.17 TCM Originate/Answer: 1800 Hz Transmit Level -10dBm (dial-up), 0 dBm (leased-line); dBm level selectable with DIP-Switch #3 in leased line setting; -10dBm (dial-up), -13 dBm (leased-line)* Frequency Stability ñ0.01% Receiver Sensitivity -43 dBm under worst-case conditions AGC Dynamic Range 43 dB Interface EIA RS232C/CCITT V.24 Connectors DB25 (RS232C) connector; Two RJ11 modular phone jack: for line, and telephone set (or two BT plugs--BABT); power jack. *BABT Only Diagnostics Power-on Self Test, Local Analog Loop, Local Digital Loop, Remote Digital Loop. Indicators LEDs for Send Data, Receive Data, Carrier Detect, various speed indicators, Off Hook, Terminal Ready, Error Correction, Fax. Controls Toggle switches for Voice/Data with Originate and Answer, ON/OFF Switch, DIP-Switches for various modem options Speaker 2-inch cone with software- or command-controlled volume. Operating 0ø to 50ø C (32ø to 120ø F) Temperature Power Requirement 115 Volts AC, 60 Hz, .3 amp (2-prong outlet-mounted transformer); 240V/50Hz optional (international) Dimensions 6.15" x 9.0" x 1.375" 15.6 cm x 22.9 cm x 3.5 cm Weight 1.6 pounds/0.72 Kg (without transformer) 2.6 pounds/1.18Kg (with transformer) Limited Warranty Five years Appendix C The Multi-Tech Supervisory Protocol (MSP) is used for communication between the MT2834PCS and the PC whenever the AT>P1 command has been sent to the MT2834PCS. MSP is the basis of a mode of operation in which packets of information are transmitted asynchronously between the PC and modem. It specifies unique bit sequences for voice, data, and "qualified" (control) packet headers, so that each of the three are distinguishable from a multiplexed sequence of packets. Modes of Operation MSP specifies two general modes of operation: packet mode and stream mode. The active mode of operation is determined by the PC or other such device (hereafter referred to as the transmitter) by issuing one or more of the following: the modem's recognized Escape sequence, one or more AT commands, or a qualified packet. Packet Mode Packet mode allows the multiplexing of diverse packet types into a single stream of data. This relieves the transmitter of having to specify a new mode everytime the type of data changes. This is the default condition between the PC and the MT2834PCS immediately after the AT>P1 command has been issued to the MT2834PCS. Note: The MT2834PCS does not have to enter command mode to receive, interpret, or implement commands received in the form of qualified packets. Stream Mode If the transmitter is setup to send large amounts of one type of packet (i.e., voice, data, or qualified information), it may force the receiver into stream mode for that particular type of data. For example, if a file transfer has been initiated, then a stream of data packets can be expected either from the PC to the modem or visa versa, depending on whether the PC is uploading or downloading the file(s). Putting the receiver into stream mode saves the processing requirements of identifying each type of packet, because the receiver only needs to scan for the signal within a packet. All other packets are predesignated as a particular type. Changing Modes of Operation When the nature of data being transferred changes, the transmitter forces the receiver into the appropriate mode (either another type of stream mode or packet mode). To change the mode of operation, the modem must be taken out of packet or stream mode, into AT command mode, and back into packet mode. Specifications The following specifications pertain to the Multi-Tech Supervisory Protocol (MSP) as it operates over an asynchronous serial link. Timing Method: One 8-bit sync byte heads each packet Data Format: Packetized or Streamed Byte Size: Eight Bits, No Parity Packet Structure: Sync Synchronization Byte (01h) heads all packet types ID/LI Information Byte includes an ID (bit #7) and a Packet-Length Indicator field (01h to 7Fh)* Qual Qualifier Byte (present in Qualified packets only) identifies the nature of the command that follows. Data Data Bytes convey the useful information being transferred. * Voice packets are pre-set to 24 or 39 bytes long -- this byte is 00h in voice packets. Also, the Length Indicator counts the Qualifier Byte in Qualified Packets as one byte. Field Specifications The first byte of each MSP packet is a synchronization field (0000 0001h), which keeps the protocols in step with one another. The second byte of each MSP packet carries two units of information. The seventh bit of this field (the ID bit) identifies the type of packet in conjunction with the remaining seven bits (positions 0-6), which indicate the number of bytes to follow. The value of the second field maps to the following ranges: Valid ID/LI Values Voice 00h ONLY Data 01h-7Fh Qualified 81h-FFh The third byte in the MSP packet will be the first byte of data if the ID indicates any packet other than a Qualified packet. If the packet is identified as a Qualified packet (i.e., the second byte of the packet has a value between 81h and FFh), the third byte will be a Qualifier field, used to indicate the command or parameter contained in the packet. The recognized values are as follows: Examples of Packet Structure Using the descriptions in the Specifications section, this section will show examples of the three types of packets. Data Packet Structure Voice Packet Structure Qualified Packet Structure Appendix D Tone Dial Frequencies The tone-dialing method combines two frequencies for each of the twelve digits found on a Touch Tone dial pad. This method is referred to as Dual-Tone Multi-Frequency (DTMF) dialing. The four horizontal rows on a Touch-Tone keypad use the four low frequencies (697, 770, 852, 941 Hz), while the three vertical columns use the three high frequencies (1209, 1336, 1477 Hz). The generally accepted tone frequency tolerance is +0.02%. For example, the digit 4 would be dialed by combining two tone frequencies. It would use the frequency 770 Hz from the second row, and the frequency 1209 Hz from the first column. In another example, the digit 9 would be dialed with the tone frequencies of 852 Hz and 1477 Hz. The extended DTMF characters (A, B, C, D) are the high-end frequencies (1633 Hz) defined on some telephone sets with a fourth vertical column of buttons. This fourth column provides for extended PBX control functions; the actual functions provided are dependent on the PBX manaufacturer's implementation and feature set.