
MOTOROLA, INC.

POWER 28.8 DATA/FAX MODEM

Modem Type                   Data (synchronous/asynchronous)/Fax
Maximum Data Rate            28.8Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     External
Fax Class                    Class I & II
Data Modulation Protocol     Bell 103A/212A

                             ITU-T V.21, V.22, V.22bis, V.23, V.32,
                             V.32bis, V.34
Fax Modulation Protocol      ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression MNP5, V.42, V.42bis

[Image]

                                CONNECTIONS

         Purpose             Location          Purpose           Location

  Line out                     CN1       DC power                  CN4

  Line in                      CN2       Power switch              SW1

  RS-232/422                   CN3

             FACTORY RESET

        Mode                SW2

  Normal operation          On

    NVRAM clear             Off

                             DIAGNOSTIC LED(S)

    LED         Color         Status                 Condition

     MR          Red            On                  Power is on

     MR          Red            Off                 Power is off

     MR          Red         Blinking      Modem is performing self-test

     TR          Red            On               DTR signal is high

     TR          Red            Off              DTR signal is low

     CD          Red            On            Carrier signal detected

     CD          Red            Off         Carrier signal not detected

     CD          Red         Blinking         Modem is being configured
                                                      remotely

     RD          Red            On            Modem is receiving data

     RD          Red            Off         Modem is not receiving data

     SD          Red            On           Modem is transmitting data

     SD          Red            Off        Modem is not transmitting data

     AA          Red            On              Auto-answer enabled

     AA          Red            Off             Auto-answer disabled

     AA          Red         Blinking             Phone is ringing

     OH          Red            On               Modem is off-hook

     OH          Red            Off               Modem is on-hook

     HS          Red            On         Modem is operating at 16.8Kbps
                                                     or faster

     HS          Red            Off          Modem is operating between
                                                4800bps and 14.4Kbps

     HS          Red         Blinking       Modem is operating at 2400bps
                                                     or slower

                         Proprietary AT Command Set

                     AUTO-RELIABLE FALLBACK CHARACTER

  Type:              Register

  Format:            AT [cmds] %An [cmds]

  Example:           AT%A20<CR>

  Default:           0

  Range:             0-127

  Unit:              ASCII

  Description:       Sets the character used as the auto-reliable
                     fallback character. %A0 will disable this function.

                  AUTO-RELIABLE TIME BUFFER CONFIGURATION

  Type:          Configuration

  Format:        AT [cmds] \Cn [cmds]

  Example:       AT \C1 &W<CR>

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

    Command                              Function

   \C0          Data is discarded.

      \C1        Data is buffered.

                                BREAK TYPE

  Type:          Configuration

  Format:        AT [cmds] \Kn [cmds]

  Example:       AT \K1 <CR>

  Description:   Configures action of break signal.

    Command                              Function

      \K1        Buffers cleared and break sent to remote modem.

      \K3        Send break to remote modem immediately.

      \K5        Send break with transmitted data.

                                BREAK SEND

  Type:          Configuration

  Format:        AT [cmds] \Bn [cmds]

  Example:       AT \B50 O<CR>

  Default:       35

  Range:         1-255

  Unit:          20ms

  Description:   Sends break to modem.

                                 CALLER ID

  Type:          Configuration

  Format:        AT [cmds] *IDn [cmds]

  Example:       AT *ID1<CR>

  Description:   Controls the Caller ID function.

    Command                              Function

   *ID0         Caller ID disabled.

      *ID1       Caller ID enabled.

                                 CD SIGNAL

  Type:          Configuration

  Format:        AT [cmds] &Cn [cmds]

  Example:       AT &C3 *RS1 *SR1<CR>

  Description:   Configures the behavior of the carrier detect signal.

    Command                              Function

      &C0        CD forced high.

   &C1          CD normal.

      &C2        CD forced high except during disconnect.

      &C3        CD follows remote RTS signal.

                                COMMAND SET

  Type:                Configuration

  Format:              AT [cmds] *NTn [cmds]

  Example:             AT *NT0<CR>

  Description:         Disables the AT command set.

  Note:                To re-enable the command set, power down the modem
                       and then cycle power seven times. The modem must
                       remain powered on each time at least one second
                       but not more than five.

       Command                              Function

         *NT0          Command set disabled.

   *NT1               Command set enabled.

                                COMPRESSION

  Type:          Configuration

  Format:        AT %Cn

  Example:       AT *EC0 %C1 *AP0<CR>

  Description:   Selects data compression.

    Command                              Function

      %C0        Data compression disabled.

   %C1          Data compression enabled.

                               CONNECT MODE

  Type:          Configuration

  Format:        AT [cmds] \Nn [cmds]

  Example:       AT \N1 DT555-1212<CR>

  Description:   Sets connect mode.

    Command                              Function

      \N0        Normal mode enabled.

      \N1        Direct mode enabled.

      \N6        LAP-M mode with fallback to MNP enabled.

   \N7          LAP-M mode with fallback to MNP and normal modes
                 enabled.

                       CONNECTION SPEED LOWER LIMIT

  Type:          Configuration

  Format:        AT [cmds] %Ln [cmds]

  Example:       AT %L3 %B14 \J0<CR>

  Description:   Sets slowest allowed connection speed.

    Command                              Function

   %L0          Disabled.

      %L2        Select 1200bps minimum speed.

      %L3        Select 2400bps minimum speed.

      %L4        Select 4800bps minimum speed.

      %L5        Select 9600bps uncoded minimum speed.

      %L6        Select 9600bps minimum speed.

      %L7        Select 7200bps minimum speed.

      %L8        Select 12Kbps minimum speed.

      %L9        Select 14.4Kbps minimum speed.

      %L10       Select 600bps minimum speed.

      %L11       Select 16.8Kbps minimum speed.

      %L12       Select 19.2Kbps minimum speed.

      %L13       Select 21.6Kbps minimum speed.

      %L14       Select 24Kbps minimum speed.

      %L15       Select 26.4Kbps minimum speed.

      %L16       Select 28.8Kbps minimum speed.

                       CONNECTION SPEED UPPER LIMIT

  Type:          Configuration

  Format:        AT [cmds] %Bn [cmds]

  Example:       AT %L3 %B14 \J0<CR>

  Description:   Sets fastest allowed connection speed.

    Command                              Function

      %B0        Follow serial port speed.

      %B1        Select 300bps maximum speed.

      %B2        Select 1200bps maximum speed.

      %B3        Select 2400bps maximum speed.

      %B4        Select 4800bps maximum speed.

      %B5        Select 9600bps uncoded maximum speed.

      %B6        Select 9600bps maximum speed.

      %B7        Select 7200bps maximum speed.

      %B8        Select 12Kbps maximum speed.

   %B9          Select 14.4Kbps maximum speed.

      %B10       Select 600bps maximum speed.

      %B11       Select 16.8Kbps maximum speed.

      %B12       Select 19.2Kbps maximum speed.

      %B13       Select 21.6Kbps maximum speed.

      %B14       Select 24Kbps maximum speed.

      %B15       Select 26.4Kbps maximum speed.

      %B16       Select 28.8Kbps maximum speed.

                                CTS SIGNAL

  Type:          Configuration

  Format:        AT [cmds] &Rn [cmds]

  Example:       AT &R0<CR>

  Description:   Selects the function of the CTS signal.

    Command                              Function

      &R0        CTS normal.

   &R1          CTS forced high.

      &R2        CTS follows CD.

      &R9        CTS follows RTS.

                          DISCONNECT BUFFER DELAY

  Type:                Configuration

  Format:              AT [cmds] %Dn [cmds]

  Example:             AT %D0<CR>

  Default:             0

  Range:               0-255

  Unit:                1 minute

  Description:         Configures how long the modem will wait to
                       disconnect if there is data in the transmit or
                       receive buffers.

                          DISPLAY STORED NUMBERS

  Type:          Immediate

  Format:        AT [cmds] *ND [cmds]

  Example:       AT*CN3,555-1212 *ND<CR>

  Description:   Displays all stored phone numbers.

                                DSR SIGNAL

  Type:          Configuration

  Format:        AT [cmds] &Sn [cmds]

  Example:       AT &S0<CR>

  Description:   Selects the function of the DSR signal.

    Command                              Function

   &S0          DSR forced high.

      &S1        DSR normal.

      &S2        DSR normal, except forced low on disconnect.

      &S3        DSR follows OH.

                                DTR SIGNAL

  Type:          Configuration

  Format:        AT [cmds] &Dn [cmds]

  Example:       AT &D1<CR>

  Description:   Configures the behavior of the Data Terminal Ready
                 signal.

    Command                              Function

      &D0        DTR forced high.

      &D1        Modem will enter command mode on low DTR.

   &D2          Modem will disconnect on low DTR.

      &D3        Modem will disconnect and reset on low DTR.

      &D9        DTR dialing enabled.

                           EXTENDED RESULT CODES

  Type:          Configuration

  Format:        AT [cmds] \Vn [cmds]

  Example:       AT \V1 %C1<CR>

  Description:   Selects extended result codes.

    Command                              Function

      \V0        Extended result codes disabled, DTE speed reported.

      \V1        Protocol result codes enabled, DTE speed reported.

      \V2        Extended result codes disabled, DCE speed reported.

      \V3        Protocol result codes enabled, DCE speed reported.

   \V4          Protocol and modulation result codes enabled, DCE speed
                 reported.

                               FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] \Gn [cmds]

  Example:       AT G1 &M0<CR>

  Description:   Selects modem port flow control.

    Command                              Function

   \G0          Flow control disabled.

      \G1        Flow control enabled.

                FLOW CONTROL CHARACTER - XOFF FROM TERMINAL

  Type:          Register

  Format:        AT [cmds] S45=n [cmds]

  Example:       ATS45=22<CR>

  Default:       19

  Range:         0-127

  Unit:          ASCII

  Description:   Sets the character the terminal sends to represent XOFF.

                FLOW CONTROL CHARACTER - XON FROM TERMINAL

  Type:          Register

  Format:        AT [cmds] S44=n [cmds]

  Example:       ATS44=20<CR>

  Default:       17

  Range:         0-127

  Unit:          ASCII

  Description:   Sets the character the terminal sends to represent XON.

                 FLOW CONTROL CHARACTER - XOFF TO TERMINAL

  Type:          Register

  Format:        AT [cmds] S50=n [cmds]

  Example:       ATS50=23<CR>

  Default:       19

  Range:         0-127

  Unit:          ASCII

  Description:   Sets the character the modem sends to represent XOFF.

                 FLOW CONTROL CHARACTER - XON TO TERMINAL

  Type:          Register

  Format:        AT [cmds] S49=n [cmds]

  Example:       ATS49=21<CR>

  Default:       17

  Range:         0-127

  Unit:          ASCII

  Description:   Sets the character the modem sends to represent XON.

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] \Qn [cmds]

  Example:       AT \Q5<CR>

  Description:   Sets type of flow control used by modem.

    Command                              Function

      \Q0        Flow control disabled.

      \Q1        Bidirectional XON/XOFF flow control enabled.

      \Q2        CTS flow control by DCE enabled.

   \Q3          Bidirectional CTS/RTS flow control enabled.

                               FORCE RETRAIN

  Type:          Immediate

  Format:        AT [cmds] *RRn [cmds]

  Example:       AT *RR14 O<CR>

  Description:   Forces the modem to attempt to retrain to the selected
                 speed.

    Command                              Function

      *RR0       Attempt 2400bps speed.

      *RR1       Attempt 4800bps speed.

      *RR2       Attempt 7200bps speed.

      *RR3       Attempt 9600bps speed.

      *RR4       Attempt 12Kbps speed.

      *RR5       Attempt 14.4Kbps speed.

      *RR6       Attempt 16.8Kbps speed.

      *RR7       Attempt 19.2Kbps speed.

      *RR8       Attempt 21.6Kbps speed.

      *RR9       Attempt 24Kbps speed.

     *RR10       Attempt 26.4Kbps speed.

     *RR11       Attempt 28.8Kbps speed.

                               HANG UP MODE

  Type:          Configuration

  Format:        AT [cmds] Hn [cmds]

  Example:       AT H3 O<CR>

  Description:   Selects how the modem will hang up.

    Command                              Function

   H2           Set hang up mode to normal on next ATH command.

       H3        Set hang up mode to fast on next ATH command.

                               HELP SCREENS

  Type:                 Immediate

  Format:               AT $H=xxxx

  Example:              AT $H=MNP<CR>

  Description:          Shows modem help screens. If a string is included
                        as shown in the example, the modem will perform a
                        search for the string; otherwise, the whole help
                        section will be displayed.

                             INACTIVITY TIMER

  Type:             Register

  Format:           AT [cmds] \Tn [cmds]

  Example:          AT\T20<CR>

  Default:          0

  Range:            0-255

  Unit:             1 minute

  Description:      Sets the length of time that the modem does not
                    receive information before it disconnects.

                             LOCK SERIAL PORT

  Type:          Configuration

  Format:        AT [cmds] \Jn [cmds]

  Example:       AT %L3 %B14 \J0<CR>

  Description:   Sets operation of serial port speed.

    Command                              Function

   \J0          Serial speed locked.

      \J1        Serial speed follows connect speed.

                    MAXIMUM BLOCK SIZE FOR TRANSMISSION

  Type:          Configuration

  Format:        AT [cmds] \An [cmds]

  Example:       AT \A3 %C1<CR>

  Description:   Sets the maximum transmittable block size.

    Command                              Function

      \A0        MNP block size is 64 characters.

      \A1        MNP block size is 128 characters.

      \A2        MNP block size is 192 characters.

   \A3          MNP block size is 256 characters.

                              PROTOCOL/SPEED

  Type:          Configuration

  Format:        AT [cmds] *MMn [cmds]

  Example:       AT *MN6 *MX14 *MM11<CR>

  Description:   Selects the current protocol.

    Command                              Function

      *MM0       Selects all protocols.

      *MM1       Selects V.21 only.

      *MM2       Selects Bell 103 only.

      *MM3       Selects V.23 only.

      *MM4       Selects Bell 212 only.

      *MM5       Selects V.22bis only.

     *MM11       Selects V.32bis only.

     *MM12       Selects V.34 only.

                              REDIAL DISABLE

  Type:          Configuration

  Format:        AT [cmds] *DNn [cmds]

  Example:       AT *DN1<CR>

  Description:   Disables the ability to redial the last number with A/.

    Command                              Function

   *DN0         A/ enabled.

      *DN1       A/ disabled.

                         REMOTE CONFIGURATION END

  Type:          Configuration

  Format:        AT [cmds] *RQn [cmds]

  Example:       AT *RQ0 D555-1212<CR>

  Description:   Ends an active remote configuration session.

    Command                              Function

      *RQ0       Quit and save changes.

      *RQ1       Quit and discard changes.

                        REMOTE CONFIGURATION PARITY

  Type:          Configuration

  Format:        AT [cmds] *RFn [cmds]

  Example:       AT *RB16 *RF5<CR>

  Description:   Sets remote computers parity in remote configuration
                 mode.

    Command                              Function

      *RF0       Use 7 data bits, MARK parity, and one stop bit.

      *RF1       Use 7 data bits, no parity, and two stop bits.

      *RF2       Use 7 data bits, odd parity, and one stop bit.

      *RF3       Use 7 data bits, even parity, and one stop bit.

      *RF4       Use 8 data bits, MARK parity, and one stop bit.

      *RF5       Use 8 data bits, no parity, and one stop bit.

      *RF6       Use 8 data bits, odd parity, and one stop bit.

      *RF7       Use 8 data bits, even parity, and one stop bit.

                       REMOTE CONFIGURATION PASSWORD

  Type:                Configuration

  Format:              AT [cmds] %P=nnnn [cmds]

  Example:             AT %P=102475 D555-1212<CR>

  Default:             N/A

  Range:               0-99999999, D, <none>

  Description:         Sets the security code for remote configuration
                       sessions. If nnnn is omitted, the code will be
                       cleared; if a D is given, remote configuration is
                       disabled.

                      REMOTE CONFIGURATION PERMISSION

  Type:          Configuration

  Format:        AT [cmds] *RAn [cmds]

  Example:       AT *RA0 D555-1212<CR>

  Description:   Selects whether remote modems may configure the local
                 modem.

    Command                              Function

      *RA0       Remote configuration requests will be denied.

      *RA1       Remote configuration requests will be allowed.

                  REMOTE CONFIGURATION SERIAL PORT SPEED

  Type:          Configuration

  Format:        AT [cmds] *RBn [cmds]

  Example:       AT *RB16 *RF5<CR>

  Description:   Sets remote computers serial port speed in remote
                 configuration mode.

    Command                              Function

      *RB0       Sets 300bps speed.

      *RB1       Sets 600bps speed.

      *RB2       Sets 1200bps speed.

      *RB3       Sets 2400bps speed.

      *RB4       Sets 4800bps speed.

      *RB5       Sets 7200bps speed.

      *RB6       Sets 9600bps speed.

      *RB7       Sets 12Kbps speed.

      *RB8       Sets 14.4Kbps speed.

      *RB9       Sets 16.8Kbps speed.

     *RB10       Sets 19.2Kbps speed.

     *RB11       Sets 21.6Kbps speed.

     *RB12       Sets 24Kbps speed.

     *RB13       Sets 26.4Kbps speed.

     *RB14       Sets 28.8Kbps speed.

     *RB15       Sets 38.4Kbps speed.

     *RB16       Sets 57.6Kbps speed.

     *RB17       Sets 115.2Kbps speed.

                            REPORT INFORMATION

  Type:          Immediate

  Format:        AT [cmds] In [cmds]

  Example:       AT I3 &V1 %V<CR>

  Description:   Displays modem properties.

    Command                              Function

       I0        Reports modem model and speed.

       I1        Reports checksum number.

       I3        Reports firmware version.

       I4        Reports feature code.

       I5        Reports reason for last disconnect.

               REPORT INFORMATION AND CONFIGURATION PROFILE

  Type:          Immediate

  Format:        AT [cmds] &Vn [cmds]

  Example:       AT I3 &V1 %V<CR>

  Description:   Reports configuration profiles and other information.

    Command                              Function

      &V0        Report configuration profiles.

      &V1        Report connection status and internal modem information.

      &V2        Report active configuration profile.

                          REPORT PRODUCT VERSION

  Type:          Immediate

  Format:        AT [cmds] %V [cmds]

  Example:       AT I3 &V1 %V<CR>

  Description:   Reports product version.

                           REPORT SERIAL NUMBER

  Type:          Immediate

  Format:        AT [cmds] $V [cmds]

  Example:       AT I3 &V1 $V<CR>

  Description:   Reports product serial number.

                            RETRAIN SENSITIVITY

  Type:                Configuration

  Format:              AT [cmds] %Rn [cmds]

  Example:             AT &C3 %R1<CR>

  Description:         Sets how poor line conditions must be before the
                       modem will initiate a retrain.

       Command                              Function

   %R0                Modem will not initiate retrain.

         %R1           Modem will initiate retrain when the Bit Error
                       Rate exceeds 10-5 for eight seconds, or for one
                       second in V.22bis mode.

         %R2           Modem will initiate retrain when the Bit Error
                       Rate exceeds 10-4 for eight seconds, or for one
                       second in V.22bis mode.

         %R3           Modem will initiate retrain when the Bit Error
                       Rate exceeds 10-3 for eight seconds, or for one
                       second in V.22bis mode.

                                 RI SIGNAL

  Type:          Configuration

  Format:        AT [cmds] \Rn [cmds]

  Example:       AT \R0 Q0<CR>

  Description:   Controls the behavior of the Ring Indicator signal.

    Command                              Function

      \R0        RI signal high during rings, and forced high for
                 duration of call.

   \R1          RI signal high during rings only.

                         SECURITY - CALLBACK DELAY

  Type:               Register

  Format:             AT [cmds] S74=n [cmds]

  Example:            AT S74=30<CR>

  Default:            15

  Range:              0-255

  Unit:               1 second

  Description:        Configures how long the modem will wait to execute
                      a callback sequence after the user has
                      disconnected.

                        SECURITY - CALLBACK NUMBER

  Type:          Configuration

  Format:        AT [cmds] $Cn=<#> [cmds]

  Example:       AT $L0=3 $C0=1(303)443-3388<CR>

  Description:   Sets the callback number for user number n.

                         SECURITY - CALLBACK RETRY

  Type:            Register

  Format:          AT [cmds] S75=n [cmds]

  Example:         AT S75=5<CR>

  Default:         0

  Range:           0-255

  Unit:            1 redial

  Description:     Sets how many times the modem will attempt to execute
                   a callback if the first call fails.

                      SECURITY - CALLBACK RETRY DELAY

  Type:              Register

  Format:            AT [cmds] S76=n [cmds]

  Example:           AT S76=60<CR>

  Default:           15

  Range:             0-255

  Unit:              1 second

  Description:       Configures how long the modem will wait to execute
                     another callback sequence after one has failed.

                              SECURITY CHECK

  Type:          Immediate

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

                 AT [cmds] $E? [cmds]

  Example:       AT $DR $D?<CR>

  Description:   Reports whether security is enabled.

                             SECURITY DISABLE

  Type:          Immediate

  Format:        AT [cmds] $D=xxxx

  Example:       AT $D=MicroHouse<CR>

  Description:   Disables security. A password must be specified.

                              SECURITY ENABLE

  Type:          Immediate

  Format:        AT [cmds] $EH=xxxx

  Example:       AT $EH=SuperSecret<CR>

  Description:   Enables security. The superuser password must be
                 specified.

                          SECURITY - DELETE USER

  Type:          Configuration

  Format:        AT [cmds] $Rn [cmds]

  Example:       AT $R3<CR>

  Description:   Deletes the user number n. User IDs 0 and 1 cannot be
                 deleted.

                 SECURITY - FAILED LOGIN ATTEMPT COUNTERS

  Type:               Configuration/Immediate

  Format:             AT [cmds] $Mn [cmds]

  Example:            AT $M $M*<CR>

  Description:        Displays or clears the counters for failed login
                      attempts. If a number is specified, the counter
                      will be reset for that user. If an * follows, all
                      counters will be cleared. If no character follows,
                      the counters will be displayed.

                  SECURITY - FAILED LOGIN ATTEMPT MAXIMUM

  Type:            Register

  Format:          AT [cmds] S77=n [cmds]

  Example:         AT S77=3<CR>

  Default:         0

  Range:           0-255

  Unit:            1 attempt

  Description:     Sets the maximum number of failed logins the modem
                   will accept until it disconnects.

                              SECURITY LEVEL

  Type:               Configuration

  Format:             AT [cmds] $Lm=n [cmds]

  Example:            AT $L0=3 $C0=1(303)443-3388<CR>

  Description:        Sets the security level for user number m.

      Command                              Function

       $Lm=1          Modem prompts for a user ID and password on
                      connection.

       $Lm=2          Modem prompts for a user ID and password on
                      connection, then modem begins callback sequence.

       $Lm=3          Modem prompts for a user ID and password on
                      connection, then modem begins callback sequence.
                      When modem reconnects, it prompts for a user ID and
                      password again.

                              SECURITY LOGIN

  Type:          Immediate

  Format:        AT [cmds] $n=xxxx [cmds]

  Example:       AT $1=MicroHouse<CR>

  Description:   Logs into modem, from the local machine or remotely.

                              SECURITY LOGOUT

  Type:          Immediate

  Format:        AT [cmds] $$ [cmds]

  Example:       AT $$<CR>

  Description:   Logs out from the modem.

                             SECURITY PASSWORD

  Type:             Configuration

  Format:           AT [cmds] $Pn=xxxx$xxxx

  Example:          AT $P0=SuperSecret$SuperSecret<CR>

  Description:      Sets the password for user number n to xxxx. User
                    number 0 is the superuser. The password must be
                    between 4 and 34 characters inclusive. The $
                    character may not be used.

                         SECURITY - PASSWORD TIME

  Type:          Register

  Format:        AT [cmds] S73=n [cmds]

  Example:       AT S73=10<CR>

  Default:       Unidentified

  Range:         0-255

  Unit:          1 second

  Description:   Configures how long the modem will wait for a password
                 when in secure mode.

                    SECURITY - REPORT SUPERUSER STATUS

  Type:          Immediate

  Format:        AT [cmds] $Sn? [cmds]

  Example:       AT $S3?<CR>

  Description:   Reports whether user n has superuser status.

                      SECURITY - REPORT USER SETTINGS

  Type:          Immediate

  Format:        AT [cmds] $In [cmds]

  Example:       AT $I3<CR>

  Description:   Reports security level and callback number for user n.

                              SECURITY RESET

  Type:          Configuration

  Format:        AT [cmds] $F=xxxx$xxxx

  Example:       AT $F=SuperSecret$SuperSecret<CR>

  Description:   Resets the high security options to their factory
                 defaults.

                         SECURITY - SUPERUSER MODE

  Type:          Immediate

  Format:        AT [cmds] $S=xxxx [cmds]

  Example:       AT $S=SuperSecret<CR>

  Description:   Attempts to enter superuser mode.

                        STATUS REGISTER HEXADECIMAL

  Type:           Configuration

  Format:         Write: AT [cmds] Sn=^hh [cmds]

                  Read: AT [cmds] Sn?^ [cmds]

  Example:        AT S99=^3F S99?^<CR>

  Description:    Sets register n to hexadecimal number hh or displays
                  register n in hexadecimal.

                     SWITCHED LINE TRANSMISSION LEVEL

  Type:          Configuration

  Format:        AT [cmds] *TDn [cmds]

  Example:       AT *TD15<CR>

  Default:       9

  Range:         9 - 30

  Unit:          -1 dBm

  Description:   Sets the signal level for transmission when in switched
                 line mode.

              TEST MODE - BIDIRECTIONAL DIGITAL LOOPBACK TEST

  Type:          Configuration

  Format:        AT [cmds] *DGn [cmds]

  Example:       AT *DG1<CR>

  Description:   Controls the bidirectional local digital loopback test
                 mode.

    Command                              Function

   *DG0         End loopback test.

      *DG1       Begin loopback test.

                          V.32 HANDSHAKE OPTIONS

  Type:          Configuration

  Format:        AT [cmds] *FTn [cmds]

  Example:       AT *FT0<CR>

  Description:   Shortens V.32 and V.32bis handshake time.

    Command                              Function

   *FT0         Normal handshake sequence.

      *FT1       Training time is shortened by 2 seconds in V.32 and
                 V.32bis modes.

                         V.34 RETRAIN SENSITIVITY

  Type:              Configuration

  Format:            AT [cmds] *THn [cmds]

  Example:           AT *MM12 *TH1<CR>

  Description:       Sets how poor line conditions must be before the
                     modem will initiate a retrain when in V.34 mode.

      Command                              Function

       *TH0          Modem will initiate retrain when the Bit Error Rate
                     exceeds 10-6.

       *TH1          Modem will initiate retrain when the Bit Error Rate
                     exceeds 10-4.

   *TH2             Modem will initiate retrain when the Bit Error Rate
                     exceeds 10-2.

                           V.34 SPLIT BAUD MODE

  Type:          Configuration

  Format:        AT [cmds] *ASn [cmds]

  Example:       AT *AS1 <CR>

  Description:   Controls V.34 split baud mode.

    Command                              Function

      *AS0       V.34 split baud mode disabled.

   *AS1         V.34 split baud mode enabled.

                           V.42 NEGOTIATION MODE

  Type:          Configuration

  Format:        AT [cmds] \Mn [cmds]

  Example:       AT \M0 H1 DT555-1212<CR>

  Description:   Selects how the modem negotiates V.42 modulation during
                 handshaking.

    Command                              Function

      \M0        Normal handshaking enabled.

      \M1        Fast handshaking enabled.

                           XON/XOFF PASS-THROUGH

  Type:          Configuration

  Format:        AT [cmds] \Xn [cmds]

  Example:       AT \X7 O<CR>

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

    Command                              Function

   \X0          XON/XOFF signals trapped by local modem.

      \X1        XON/XOFF passed through local modem.

