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 ownerÆs 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 <CR>,
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: <Ctrl>. 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: <Alt>+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 <Ctrl>+<Alt>+<Del>, you should press and
hold the <Ctrl> and <Alt> keys, then strike the <Del> key.
Finally, there are two ways in which we set off text. We use bold·italic
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<CR> 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<CR>
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<CR>
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 <CR> 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<CR> or <BREAK>AT<CR>.
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<CR> or <BREAK>AT<CR>) .
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<CR> or <BREAK>AT<CR>),
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<CR> or
<BREAK>AT<CR>) 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<CR> or <BREAK>AT<CR>) 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<CR> or
<BREAK>AT<CR>) 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<CR> or
<BREAK>AT<CR>) 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 ± 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 ±0.01%
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 0° to 50° C (32° to 120° 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 <Break> 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.
