
MULTI-TECH SYSTEMS, INC.

MT2834ECT4/MT2834ECT4I

Modem Type                  Data (synchronous/asynchronous)/Fax/Voice
NIC Type                    Ethernet
Processor                   80486SLC
Maximum Modem Transfer Rate 28.8Kbps
Maximum Fax Transfer Rate   14.4Kbps
Maximum NIC Transfer Rate   10Mbps
Processor Speed             25MHz
Data Bus                    N/A (see technical note)
Topology                    Linear Bus/Star
Fax Class                   Class I & II
Wiring Type                 Unshielded twisted pair

                            RG-58A/U 50ohm coaxial
Data Modulation Protocol    Bell 103A/212A

                            ITU-T V.22, V.22bis, V.32, V.32bis, V.34
Fax Modulation Protocol     ITU-T V.17, V.27ter, V.29
Error                       MNP5, V.42, V.42bis
Correction/Compression
Boot ROM                    Available
Max. Onboard DRAM           16MB

[Image]

[Image]

                                CONNECTIONS

          Purpose            Location           Purpose         Location

  Daughterboard connectors  CN1 & CN1A    Keyboard                 CN6

  Line out                      CN2       VGA video out            CN7

  RG-58A/U 50ohm coaxial        CN3       Power                    CN8

  Unshielded twisted pair       CN4       Flash BIOS for          FLASH
                                          modem

  Serial port                   CN5       Power switch             SW1

                           CABLE TYPE SELECTION

               Cable Type                              JP2

           RG-58A/U 50ohm coaxial               Pins 1 & 2 closed

          Unshielded twisted pair               Pins 2 & 3 closed

                   LOSS OF CARRIER REBOOT CONFIGURATION

                 Setting                               JP1

      Modem will not reboot on loss of                Open
                   carrier

        Modem will reboot on loss of                 Closed
                   carrier

           DRAM CONFIGURATION

     Size        Bank 0        Bank 1

     2MB        (2) 1M x 9      NONE

     4MB        (2) 1M x 9   (2) 1M x 9

     8MB        (2) 4M x 9      NONE

     16MB       (2) 4M x 9   (2) 4M x 9

                             DIAGNOSTIC LED(S)

    LED         Color         Status                 Condition

     SD          Red            On         Modem is transmitting on phone
                                                       line

     SD          Red           Off          Modem is not transmitting on
                                                    phone line

     RD          Red            On          Modem is receiving on phone
                                                       line

     RD          Red           Off        Modem is not receiving on phone
                                                       line

     CD          Red            On            Carrier signal detected

     CD          Red           Off          Carrier signal not detected

     28          Red            On          Modem connected at 28.8Kbps

     28          Red           Off        Modem not connected at 28.8Kbps

     14          Red            On          Modem connected at 14.4Kbps

     14          Red           Off        Modem not connected at 14.4Kbps

     96          Red            On          Modem connected at 9600bps

     96          Red           Off        Modem not connected at 9600bps

     OH          Red            On               Modem is off-hook

     OH          Red           Off               Modem is on-hook

     TR          Red            On              DTR signal is high

     TR          Red           Off               DTR signal is low

                         DIAGNOSTIC LED(S) (CONT)

    EC        Red           On             Modem connected with error
                                                  correction

    EC        Red           Off          Modem not connected with error
                                                  correction

    EC        Red        Blinking          Modem connected with error
                                            correction/compression

    FX        Red           On          Modem is connected in FAX mode

    FX        Red           Off        Modem is not connected in FAX mode

   PWR        Red           On                    Power is on

   PWR        Red           Off                 Power is not on

    TP        Red           On               RG-58A/U port active

    TP        Red           Off                 UTP port active

   LNK       Yellow         On               RG-58A/U link is good

   LNK       Yellow         Off            RG-58A/U link is not good

    RX        Red           On           Modem is receiving on network

    RX        Red           Off        Modem is not receiving on network

    TX        Red           On         Modem is transmitting on network

    TX        Red           Off           Modem is not transmitting on
                                                    network

                       MISCELLANEOUS TECHNICAL NOTE

  This is a standalone network modem, designed to let other workstations
  share this modem and an additional one connected to the serial port.

Proprietary AT Command Set

                  AUTO-RELIABLE TIME BUFFER CONFIGURATION

  Type:                    Configuration

      Format:              AT [cmds] $A n [cmds]

      Example:             AT $A1 &W <CR>

      Description:         Controls the handling of incoming data during
                           auto-reliable time period.

          Command                            Function

            $A0           Data is discarded.

            $A1           Data is buffered.

                                 BIT MODE

  Type:                    Configuration

      Format:              AT [cmds] $EB n [cmds]

      Example:             AT $EB1 E1 <CR>

      Description:         Selects 10- or 11-bit mode.

           Command                           Function

            $EB0          Sets 10-bit mode.

            $EB1          Sets 11-bit mode.

                              CALLBACK PARITY

  Type:                    Configuration

      Format:              AT [cmds] #P n [cmds]

      Example:             AT #P0 #DB1 <CR>

      Description:         Sets the parity of the modem when in callback
                           mode.

           Command                           Function

             #P0          No parity.

             #P1          Odd parity.

             #P2          Even parity.

                             CALLBACK PASSWORD

  Type:                Configuration

  Format:              AT [cmds] #CBN nnxxxx

  Example:             AT#DB2 #CBN09snarf <CR>

  Description:         Sets the callback password at memory location nn
                       to xxxx . The password must be between 6 and 10
                       characters, inclusive.

                             CALLBACK SECURITY

  Type:                    Configuration

      Format:              AT [cmds] #DB n [cmds]

      Example:             AT #DB1 S0=1 <CR>

      Description:         Sets the security level of the callback
                           function.

           Command                           Function

            #DB0          Disables security and clears callback memory.

            #DB1          Enables remote security only.

            #DB2          Enables local and remote security.

                    CALLER ID INFORMATION TRANSMISSION

  Type:                     Configuration

       Format:              AT [cmds] &A n [cmds]

       Example:             AT &A1 <CR>

       Description:         Controls the transmission of Caller ID
                            information stored in the EPROM. The ID must
                            be inserted into the Flash BIOS image before
                            burning.

           Command                           Function

             &A0           Caller ID information transmission disabled.

             &A1           Caller ID information transmission enabled.

                               CALLING TONE

  Type:                    Configuration

      Format:              AT [cmds] $T n [cmds]

      Example:             AT $T1 DT555-1212 <CR>

      Description:         Controls the transmission of the calling tone
                           while dialing.

           Command                           Function

             $T0          Calling tone enabled.

             $T1          Calling tone disabled.

                                COMMAND SET

  Type:                    Configuration

      Format:              AT &Q n

      Example:             AT &Q1 <CR>

      Description:         Selects standard Hayes or custom command sets.

           Command                           Function

             &Q0          Multi-Tech custom command set enabled.

             &Q1          Standard Hayes command set enabled.

                                COMPRESSION

  Type:                    Configuration

      Format:              AT &E n

      Example:             AT &E15 #L0 <CR>

      Description:         Selects data compression.

           Command                           Function

            &E14          Data compression disabled.

            &E15          Data compression enabled.

                             COMPRESSION MODE

  Type:                    Configuration

      Format:              AT #L n

      Example:             AT #L2 DT555-1212 <CR>

      Description:         Selects active compression protocols.

           Command                           Function

             #L0          V.42 negotiation enabled.

             #L1          MNP negotiation enabled.

             #L2          LAP-M negotiation enabled.

             #L3          LAP-M enabled, no negotiation.

                                CTS SIGNAL

  Type:                    Configuration

      Format:              AT [cmds] &RF n [cmds]

      Example:             AT &RF0 <CR>

      Description:         Selects the function of the CTS signal.

           Command                           Function

            &RF0          CTS is set to RTS.

            &RF1          CTS is independent of RTS.

                         DIAL STORED PHONE NUMBER

  Type:                 Immediate

  Format:               AT [cmds] N n1 [N n2 , N n3 ...]

  Example:              ATM0 N1N3N5 <CR>

  Description:          Dials stored phone number(s). If the first number
                        is busy, the modem will proceed to the next
                        number in the list.

                                DSR SIGNAL

  Type:                    Configuration

      Format:              AT [cmds] &SF n [cmds]

      Example:             AT &SF0 <CR>

      Description:         Selects the function of the DSR signal.

           Command                           Function

            &SF0          DSR is set to CD.

            &SF1          DSR is independent of CD.

                                DTR DIALING

  Type:                    Configuration

      Format:              AT [cmds] $D n [cmds]

      Example:             AT $D1 DT555-1212 <CR>

      Description:         Turns DTR dialing on and off.

           Command                           Function

             $D0          DTR dialing disabled.

             $D1          DTR dialing enabled.

                           ERASE CALLBACK NUMBER

  Type:          Immediate

  Format:        AT [cmds] #RDN n [cmds]

  Example:       AT #RCBN05 #RDN05 <CR>

  Description:   Erases the callback phone number at the memory location
                 specified.

                          ERASE CALLBACK PASSWORD

  Type:          Immediate

  Format:        AT [cmds] #RCBN n [cmds]

  Example:       AT #RCBN05 #RDN05 <CR>

  Description:   Erases the callback password at the memory location
                 specified.

                       ESCAPE SEQUENCE - OUT OF BAND

  Type:          Immediate

  Format:        <BREAK> AT [cmds] <CR>

  Example:       <BREAK> AT #F1 <CR>

  Description:   Puts the modem in Command Mode.

  Notes:         Do not precede this command with AT.

                 <BREAK> refers to the hardware modem break signal.

                               FALLBACK MODE

  Type:                    Configuration

      Format:              AT [cmds] #F n [cmds]

      Example:             AT #F1 O <CR>

      Description:         Sets direction of fallback.

           Command                           Function

             #F0          Fallback disabled.

             #F1          Fallback from 28.8Kbps to 2400bps as line
                           quality degrades.

             #F2          Fallback from 2400bps to 28.8Kbps as line
                           quality improves.

                               FLOW CONTROL

  Type:                    Configuration

      Format:              AT [cmds] &E n [cmds]

      Example:             AT &E13 <CR>

      Description:         Selects flow control.

           Command                           Function

            &E12          Flow control disabled.

            &E13          Flow control enabled.

                          FLOW CONTROL - ENQ/ACK

  Type:                    Configuration

      Format:              AT [cmds] &E n [cmds]

      Example:             AT &E9 <CR>

      Description:         Selects ENQ/ACK pacing.

           Command                           Function

             &E8          Enables ENQ/ACK pacing.

             &E9          Disables ENQ/ACK pacing.

                        FLOW CONTROL IN NORMAL MODE

  Type:                   Configuration

      Format:             AT [cmds] &E n [cmds]

      Example:            AT &E11 O <CR>

      Description:        Selects XON/XOFF flow control for
                          non-error-correcting connections.

          Command                           Function

           &E10          XON/XOFF disabled for non-error-correcting
                          connections.

           &E11          XON/XOFF enabled for non-error-correcting
                          connections.

                             FLOW CONTROL TYPE

  Type:                    Configuration

      Format:              AT [cmds] &E n [cmds]

      Example:             AT &E4 &W <CR>

      Description:         Sets type of flow control used by modem.

           Command                           Function

             &E3          Flow control disabled.

             &E4          CTS/RTS flow control enabled.

             &E5          XON/XOFF flow control enabled.

                            HANDSHAKE ATTEMPTS

  Type:                     Configuration

       Format:              AT [cmds] #A n [cmds]

       Example:             AT #A1 #L3 <CR>

       Description:         Configures the initial handshake phase.

           Command                           Function

              #A0           Attempts in order: 28.8Kbps, 24Kbps,
                            21.6Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps,
                            12Kbps, 9600bps, 4800bps, 2400bps, 1200bps,
                            300bps.

              #A1           Attempts only 28.8Kbps.

              #A2           Attempts in order: 28.8Kbps, 24Kbps,
                            21.6Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps,
                            12Kbps, 9600bps, 4800bps.

              #A3           Attempts in order: 2400bps, 1200bps, 300bps.

                               HELP SCREENS

  Type:          Immediate

  Format:        AT $H n

  Example:       AT $H1 <CR>

  Description:   Shows modem help screens.

    Command                              Function

      $H1        Shows help screen 1.

      $H2        Shows help screen 2.

      $H3        Shows help screen 3.

                            LIST CONFIGURATION

  Type:          Immediate

  Format:        AT L n

  Example:       AT L5 <CR>

  Description:   Lists modem configuration.

    Command                              Function

       L         Lists all stored phone numbers.

       L5        Lists all settings.

       L6        Lists the values of all S-registers.

       L7        Lists extended parameters.

       L8        Lists current diagnostics.

                          LOCAL SERIAL PORT SPEED

  Type:                    Configuration

      Format:              AT [cmds] $SB nnn [cmds]

      Example:             AT $MB9600 $SB19200 <CR>

      Description:         Sets serial port speed.

           Command                           Function

            $SB300         Sets 300bps speed.

            $SB1200        Sets 1200bps speed.

            $SB2400        Sets 2400bps speed.

            $SB4800        Sets 4800bps speed.

            $SB9600        Sets 9600bps speed.

           $SB19200        Sets 19.2Kbps speed.

           $SB38400        Sets 38.4Kbps speed.

           $SB57600        Sets 57.6Kbps speed.

           $SB115200       Sets 115.2Kbps speed.

                             LOCK SERIAL PORT

  Type:                    Configuration

      Format:              AT [cmds] $BA n [cmds]

      Example:             AT $SB57600 $BA0 <CR>

      Description:         Sets operation of serial port speed.

           Command                           Function

            $BA0          Serial speed locked at rate set by $SB.

            $BA1          Serial speed follows connect speed, ignoring
                           $SB.

                              LOGIN PASSWORD

  Type:                Configuration

  Format:              AT [cmds] #I xxxx

  Example:             AT #IMicroHouse <CR>

  Description:         Sets the login password to xxxx . The password
                       must be between 6 and 10 characters, case
                       sensitive. It defaults to MULTI-TECH.

                    MAXIMUM BLOCK SIZE FOR TRANSMISSION

  Type:                    Configuration

      Format:              AT [cmds] &BS n [cmds]

      Example:             AT &BS1 &MB28800 <CR>

      Description:         Sets the maximum transmittable block size.

          Command                            Function

            &BS0          Maximum block size is 64 characters.

            &BS1          Maximum block size is 128 characters for
                           LAP-M, and 256 characters for MNP.

                                  REDIAL

  Type:          Immediate

  Format:        ATA:

  Example:       AT A: <CR>

  Description:   Redials the last number dialed until it is no longer
                 busy.

                           REMOTE CONNECT SPEED

  Type:                    Configuration

      Format:              AT $MB nnn

      Example:             AT $MB9600 $SB19200 <CR>

      Description:         Sets maximum remote connect speed.

          Command                            Function

            $MB75          Sets V.23 (1200bps/75bps bi-directional).

            $MB300         Sets 300bps connect.

           $MB1200         Sets 1200bps connect.

           $MB2400         Sets 2400bps connect.

           $MB4800         Sets 4800bps connect.

           $MB9600         Sets 9600bps connect.

           $MB14400        Sets 14.4Kbps connect.

           $MB19200        Sets 19.2Kbps connect.

           $MB28800        Sets 28.8Kbps connect.

                          RETRANSMIT FAIL ACTION

  Type:                    Configuration

      Format:              AT [cmds] $R n [cmds]

      Example:             AT $R1 <CR>

      Description:         Sets whether the modem gives up on a bad
                           connection.

          Command                            Function

            $R0           Hang up after 12 failed retransmissions.

            $R1           Do not hang up after 12 failed
                           retransmissions.

                              SETUP PASSWORD

  Type:                Configuration

  Format:              AT [cmds] #S xxxx

  Example:             AT #SsNaFu <CR>

  Description:         Sets the setup password to xxxx . The password
                       must be between 6 and 10 characters, case
                       sensitive. It defaults to MODEMSETUP.

                        STORE PHONE NUMBER IN NVRAM

  Type:          Configuration

  Format:        AT [cmds] D <#> N n [dialstring]

  Example:       AT D555-1212N1 <CR>

  Description:   Stores a phone number in the modems memory.

                            TRELLIS MODULATION

  Type:                    Configuration

      Format:              AT [cmds] #T n [cmds]

      Example:             AT #T1 <CR>

      Description:         Controls Trellis Coded Modulation.

           Command                           Function

             #T0          Disables TCM.

             #T1          Enables TCM.

                               UUCP SPOOFING

  Type:                    Configuration

      Format:              AT [cmds] $SP n [cmds]

      Example:             AT $SP1 O <CR>

      Description:         Controls the UUCP spoofing function.

           Command                           Function

            $SP0          Spoofing disabled.

            $SP1          Spoofing enabled.

                           XON/XOFF PASS-THROUGH

  Type:                    Configuration

      Format:              AT [cmds] &E n [cmds]

      Example:             AT &E7 O <CR>

      Description:         Selects whether XON/XOFF signals are sent to
                           remote modem.

           Command                           Function

             &E6          XON/XOFF signals trapped by local modem.

             &E7          XON/XOFF passed through local modem.

                                 XOFF SEND

  Type:                    Configuration

      Format:              AT [cmds] #X n [cmds]

      Example:             AT #X1 <CR>

      Description:         Selects how XOFF signal is sent.

           Command                           Function

             #X0          Single XOFF character sent until ready.

             #X1          Multiple XOFF characters sent until ready.

