
MEGAHERTZ CORPORATION

CC3288/XJ2288

Modem Type                   Data (synchronous/asynchronous)/Fax
Maximum Data Rate            28.8Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     PCMCIA type II
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

                                                                      V1301

                         Proprietary AT Command Set

                        AUTO FALL FORWARD/FALLBACK

  Type:          Configuration

  Format:        AT [cmds] %Gn [cmds]

  Example:       AT %G &W <CR>

  Description:   Selects auto fallback.

  Command                                Function

  %G1            Fallback disabled.

   %G0          Fallback enabled.

                          AUTO FALLBACK CHARACTER

  Type:          Register

  Format:        AT [cmds] S43=n [cmds]

  Example:       AT S43=13 <CR>

  Default:       13

  Range:         0 - 127

  Unit:          ASCII

  Description:   Set auto fallback character during MNP negotiation.

  Notes          S43=0, disabled. S43=(1 - 127), enabled.

                             AUTO SLEEP TIMER

  Format                  AT [cmds] S46=n [cmds]

  Example:                AT S46= 100<CR>

  Default:                100

  Range:                  0 - 255

  Unit:                   100 ms

  Description:            Maximum duration of DTE and DCE inactivity
                          allowed prior to initiating low-power sleep
                          mode.

                     AUTO-RELIABLE FALLBACK CHARACTER

  Type:              Register

  Format:            AT [cmds] %An [cmds]

  Example:           AT %A20 <CR>

  Default:           13

  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.

  \C2               Data is discarded, modem returns to normal mode on
                    receiving auto-reliable fallback character.

                           AUTOSYNC HDLC ADDRESS

  Type:          Register

  Format:        AT [cmds] S20=n [cmds]

  Example:       AT S20=6 <CR>

  Default:       255

  Description:   HDLC mode = HDLC address; Bisync sync character.

                          BIT-MAPPED REGISTER S14

  Format                    AT [cmds] S14=n [cmds]

  Example:                  AT S14=170 <CR>

  Default:                  138

  Range:                    0 - 190

  Unit:                     Bit-mapped

  Description:              Controls echo, result codes, result code
                            display, dumb mode, dial mode, and
                            answer/originate mode.

       Bit          Value                       Function

        0           0          Not used.

        1           0          Command echo disabled.

                     1        Command echo enabled.

        2            0        Result codes enabled.

                    1          Result codes disabled.

        3           0          Display result codes in numeric format.

                     1        Display result codes in verbose format.

        4            0        AT command set disabled.

                    1          AT command set enabled

        5            0        Tone dial enabled.

                    1          Pulse dial enabled.

        6           0          Not used.

        7           0          Answer mode enabled.

                     1        Originate mode enabled.

                          BIT-MAPPED REGISTER S21

  Format               AT [cmds] S21=n [cmds]

  Example:             AT S21=48 <CR>

  Default:             0

  Range:               0 - 124

  Unit:                Bit-mapped

  Description:         Selects CTS signal, low DTR action, DCD signal,
                       and DSR signal.

     Bit       Value                         Function

     1, 0      0          Not used.

      2        0          CTS follows RTS.

                1        CTS forced high.

     4, 3      00         DTR signal ignored.

               01         Modem goes to command mode on low DTR.

                10       Modem disconnects on low DTR. Auto-Answer is
                          disabled.
               11
                          Modem is initialized on low DTR.

      5        0          DCD forced high.

                1        DCD normal.

      6         0        DSR forced high.

               1          DSR normal.

                          BIT-MAPPED REGISTER S22

  Format                    AT [cmds] S22=n [cmds]

  Example:                  AT S22=118 <CR>

  Default:                  118

  Range:                    0 - 255

  Unit:                     Bit-mapped

  Description:              Controls speaker volume and controls, and
                            limits results codes.

       Bit          Value                       Function

       1, 0         00          Off volume.

                    01          On volume.

                     10        Medium level volume.

                    11          High level volume.

       3, 2         00          Speaker off.

                     01        Speaker off on carrier.

                    10          Speaker always on.

                    11          Speaker on during handshake.

     6, 5, 4        000         Basic result codes only enabled.

                    100         Basic and connection speed result codes
                                enabled.
                    101
                                Basic and connection speed result codes
                    110         and dialtone detection enabled.

                     111       All result codes except dialtone
                                detection enabled.

                                All result codes enabled.

        7            0         &P0 enabled.

                    1           &P1 enabled.

                         BIT-MAPPED REGISTER S-23

  Format                    AT [cmds] S23=n [cmds]

  Example:                  AT S23=15 <CR>

  Default:                  15

  Range:                    0 - 241

  Unit:                     Bit-mapped

  Description:              Controls guard tones. Also indicates detected
                            serial port speed and parity. Also provides
                            storage for remote digital loopback tests.

        Bit           Value                      Function

         0            0           &T5 enabled.

                       1         &T4 enabled.

      3, 2, 1         0           Not used.

        5, 4           00        Even parity.

                      01          Space parity.

                      10          Odd parity.

                      11          Mark parity.

        7, 6           00        Guard tone disabled.

                      01          550Hz guard tone enabled.

                      10          1800Hz guard tone enabled.

                          BIT-MAPPED REGISTER S27

  Format                   AT [cmds] S27=n [cmds]

  Example:                 AT S27=9 <CR>

  Default:                 64

  Range:                   0 - 127

  Unit:                    Bit-mapped

  Description:             Selects sync/async mode, Line type, internal
                           clock, and ITU-T/Bell modes.

       Bit          Value                       Function

     3, 1, 0         000      Asynchronous mode, serial port speed
                               follows connect speed.
                    001
                               Asynchronous command mode and synchronous
                    010        connect mode.

                    011        Asynchronous command mode and synchronous
                               connect mode, DTR dialing enabled.
                    100
                               Asynchronous command mode on low DTR,
                               synchronous connect mode on high DTR.

                               Hayes AutoSync&trade; mode - serial port
                               locked at 9600bps.

        2            0        Dial up line.

                    1          Leased line.

       5, 4          00       Internal DTE transmit clock source.

                    01         External DTE transmit clock source.

                    10         Slave DTE transmit clock source.

        6           0          CCITT mode.

                     1        Bell mode.

                          BIT-MAPPED REGISTER S40

  Format                     AT [cmds] S40=n [cmds]

  Example:                   AT S40=65 <CR>

  Default:                   77

  Range:                     0 - 65

  Unit:                      Bit-mapped

  Description:               Controls active protocols and V.42
                             detection.

        Bit         Value                       Function

         0          0                Automatic mode-detection disabled

                     1              In originate mode, handshake begins
                                     at line speed designated by the S37
                                     register. Modem can shift to a
                                     slower speed if necessary.

                                     In answer mode, handshake attempted
                                     with the following protocols in
                                     order - V.FC, V.32bis, V.32,
                                     V.22bis, V.22 or Bell 212, V.21, and
                                     Bell 103

         1          0           Not used.

       3 - 2        1           Not used.

       5 - 4        0           Not used.

         6          0           V.42 detection disabled.

                     1         V.42 detection enabled.

                          BIT-MAPPED REGISTER S41

  Format         AT [cmds] S41=n [cmds]

  Example:       AT S41=0 <CR>

  Default:       0

  Range:         0 - 2

  Unit:          Bit-mapped

  Description:   Connect message display.

  Value                                 Function

   S41=0       Connect with DTE speed.

  S41=1         Connect with carrier, protocol, and compression.

  S41=2         Connect with DCE speed.

                          BIT-MAPPED REGISTER S44

  Format                  AT [cmds] S44=n [cmds]

  Example:                AT S44=23 <CR>

  Default:                23

  Range:                  0 - 23

  Unit:                   Bit-mapped

  Description:            Selects V.42 status, V.42bis, and fallback.

       Bit         Value                       Function

        0          0          V.42bis status disabled.

                    1        V.42bis status enabled.

      2, 1         00         V.42bis disabled.

                   01         V.42bis when transmitting enabled.

                   10         V.42bis when receiving enabled.

                    11       V.42bis when transmitting/receiving
                              enabled.

        3          0          Not used.

        4          0          Fallback disabled.

                    1        Fallback enabled.

     7, 6, 5       0          Not used.

                          BIT-MAPPED REGISTER S48

  Type:             Register

  Format:           AT [cmds] S48=n [cmds]

  Example:          AT S48=0 <CR>

  Description:      Sets auto-reliable buffer.

  Command                                 Function

   S48=0           Data is discarded.

  S48=1             Data is buffered.

  S48=2             Data is discarded, modem returns to normal mode on
                    receiving auto-reliable fallback character.

                          BIT-MAPPED REGISTER S49

  Type:          Register

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

  Example:       AT S49=255<CR>

  Description:   Set maximum block size.

  Command                                Function

  S49=32         Maximum MNP block size is 32 characters.

  S49=63         Maximum MNP block size is 64 characters.

  S49=127        Maximum MNP block size is 128 characters.

  S49=191        Maximum MNP block size is 192 characters.

   S49=255      Maximum MNP block size is 256 characters.

                          BIT-MAPPED REGISTER S51

  Format                    AT [cmds] S51=n [cmds]

  Example:                  AT S51=40 <CR>

  Default:                  3

  Range:                    0 - 115

  Unit:                     Bit-mapped

  Description:              selects flow control,

       Bit          Value                       Function

     2, 1, 0        000         Flow control disabled.

                    001         XON/XOFF flow control enabled.

                    010         CTS flow control to DTE enabled.

                     011       RTS/CTS flow control enabled.

        3              0        Not used.

        4            0         Flow control disabled.

                    1           Flow control to XON/XOFF flow enabled.

        5            0         Serial speed locked.

                    1           Serial speed follows connect speed.

       7, 6          0         XON/XOFF signals trapped by local modem.

                    1           XON/XOFF passed through local modem.

                          BIT-MAPPED REGISTER S54

  Format                 AT [cmds] S54=n [cmds]

  Example:               AT S54=69 <CR>

  Default:               0

  Range:                 0 - 255

  Unit:                  Bit-mapped

  Description:           Selects the communication protocol for data
                         calls, and protocol result code.

      Bit         Value                        Function

       0           0         B2 is enabled.

                  1           B2 is not enabled.

       1           0         B3 is enabled

                  1           B3 is not enabled.

     6 - 2        0           Not used.

       7           0         Protocol result code disabled.

                  1           Protocol result code enabled.

                                BREAK SEND

  Type:          Configuration

  Format:        AT [cmds] \Bn [cmds]

  Example:       AT \B3 &W<CR>

  Range:         1-9

  Unit:          .1 second

  Description:   Sends break to modem.

                                   BREAK TYPE

  Type:                   Configuration

  Format:                 AT [cmds] \Kn [cmds]

  Example:                AT \K1 <CR>

  Description:            Configures action of break signal.

   Command      Break from DTE     Break from         Modem        Break from
                                       DTE        receives \B    remote modem
                Reliable/Normal
                     mode         Direct mode

  \K0           Enter command     Send break to   Buffers        Buffers
                mode, do not      remote modem    cleared and    cleared and
                send break to     immediately,    break sent to  break sent to
                remote modem.     then enter      remote modem.  DTE.
                                  command mode.

  \K1           Buffers cleared   Send break to   Buffers        Buffers
                and break sent    remote modem    cleared and    cleared and
                to remote         immediately.    break sent to  break sent to
                modem.                            remote modem.  DTE.

  \K2           Enter command     Send break to   Send break to  Send break to
                mode, do not      remote modem    remote modem   DTE
                send break to     immediately,    immediately.   immediately.
                remote modem.     then enter
                                  command mode.

  \K3           Send break to     Send break to   Send break to  Send break to
                remote modem      remote modem    remote modem   DTE
                immediately.      immediately.    immediately.   immediately.

  \K4           Enter command     Send break to   Send break to  Break sent
                mode, do not      remote modem    remote modem   with received
                send break to     immediately,    with           data to the
                remote modem.     then enter      transmitted    DTE.
                                  command mode.   data.

   \K5         Send break with   Send break to   Send break to  Break sent
                transmitted       remote modem    remote modem   with received
                data.             immediately.    with           data to the
                                                  transmitted    DTE.
                                                  data.

                            BTLZ STRING LENGTH

  Type:          Register

  Format:        AT [cmds] S58=n [cmds]

  Example:       AT S58=32 <CR>

  Default:       32

  Range:         6 - 64

  Unit:          Bit-mapped

  Description:   Selects BTLZ string length.

                                COMPRESSION

  Type:          Configuration

  Format:        AT %Cn

  Example:       AT &J1 %C1 \Q0<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.

  \N2            MNP reliable mode enabled.

   \N3          LAP-M, MNP, or Normal mode enabled.

  \N4            LAP-M mode with fallback to MNP enabled.

  \N5            LAP-M mode enabled.

                       DIGITAL LINE CURRENT SENSING

  Type:          Configuration

  Format:        AT [cmds] ~~Ln [cmds]

  Example:       AT ~~L1 &W<CR>

  Description:   Controls the digital line current sensing.

  Command                                Function

      ~~L0       Digital line current sensing disable.

      ~~L1       Digital line current sensing enable.

                     DIGITAL LINE OVER-CURRENT SENSING

  Type:          Immediate

  Format:        AT [cmds] ~~S=n [cmds]

  Example:       AT ~~S= 4 <CR>

  Default:       4

  Range:         0 - 9

  Unit:          1 ms

  Description:   Sets the over-current sense time condition.

                   DISPLAY LINE OVER-CURRENT SENSE TIME

  Type:          Configuration

  Format:        AT [cmds] ~~S? [cmds]

  Example:       AT ~~S? &W<CR>

  Description:   Displays current over-current sense time in
                 milliseconds.

                              DTE RATE STATUS

  Type:          Register

  Format:        AT [cmds] S62=n [cmds]

  Example:       AT S62=16 <CR>

  Description:   Selects DTE rate.

  Command                                Function

       0         300 bps.

       1         600 bps.

       2         1200 bps.

       3         2400 bps.

       4         4800 bps.

       5         7200 bps.

       6         9600 bps.

       7         12Kbps.

       8         14.4Kbps.

       9         16.8Kbps.

       10        19.2Kbps.

       11        21.6Kbps.

       12        24Kbps.

       13        26.4Kbps.

       14        28.8Kbps.

       15        38.4Kbps.

   16           57.6Kbps.

       17        115.2Kbps.

                               FAX/DATA MODE

  Type:          Register

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

  Example:       AT S50=0 &W<CR>

  Description:   Choose data or FAX mode.

  Command                                Function

   0            Data mode enabled.

  1              FAX mode enabled.

                               FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] \Gn [cmds]

  Example:       AT G1 &K3<CR>

  Description:   Selects modem port flow control.

  Command                                Function

   \G0          Flow control disabled.

  \G1            Flow control to XON/XOFF flow enabled.

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] &Kn [cmds]

  Example:       AT &G1 &K3 <CR>

  Description:   Sets type of flow control used by modem.

  Command                                Function

  &K0            Flow control disabled.

  &K1            Not used.

  &K2            Not used.

   &K3          CTS/RTS flow control enabled.

  &K4            XON/XOFF pass-through flow control enabled.

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] \Qn [cmds]

  Example:       AT \Q0 A <CR>

  Description:   Sets type of flow control used by modem.

  Command                                Function

  \Q0            Flow control disabled.

  \Q1            XON/XOFF flow control enabled.

  \Q2            CTS flow control to DTE enabled.

   \Q3          RTS/CTS flow control enabled.

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] S52=n [cmds]

  Example:       AT &G1 S52=3 <CR>

  Description:   Sets type of flow control used by modem.

  Command                                Function

  S52=0          Flow control disabled.

  S52=1          Not used.

  S52=2          Not used.

   S52=3        CTS/RTS flow control enabled.

  S52=4          XON/XOFF pass-through flow control enabled.

                            FORCED SLEEP TIMER

  Format                  AT [cmds] S47=n [cmds]

  Example:                AT S47=100 <CR>

  Default:                10

  Range:                  0 - 255

  Unit:                   100 ms

  Description:            Specifies duration of DTE and DCE inactivity
                          allowed prior to initiating sleep mode; This is
                          used as a forced powerdown mode for PCMCIA.

                             INACTIVITY TIMER

  Type:             Register

  Format:           AT [cmds] \Tn [cmds]

  Example:          AT \T20 <CR>

  Default:          0

  Range:            0 - 90

  Unit:             1 minute

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

                          INACTIVITY TIMER VALUE

  Format         AT [cmds] S30=n [cmds]

  Example:       AT S30=0 <CR>

  Default:       0

  Range:         0 - 90

  Unit:          Minutes.

  Description:   Inactivity timer value.

                          LOCAL SERIAL PORT SPEED

  Type:          Configuration

  Format:        AT [cmds] S72=n [cmds]

  Example:       AT S72=16 *OS0 *SC1<CR>

  Description:   Sets serial port speed.

    Command                              Function

   S72=0        Sets speed automatically.

  S72=1          Sets 300bps speed.

  S72=2          Sets 600bps speed.

  S72=3          Sets 1200bps speed.

  S72=4          Sets 2400bps speed.

  S72=5          Sets 4800bps speed.

  S72=6          Sets 7200bps speed.

  S72=7          Sets 9600bps speed.

  S72=8          Sets 12Kbps speed.

  S72=9          Sets 14.4Kbps speed.

  S72=10         Sets 16.8Kbps speed.

  S72=11         Sets 19.2Kbps speed.

  S72=12         Sets 21.6Kbps speed.

  S72=13         Sets 24Kbps speed.

  S72=14         Sets 26.4Kbps speed.

  S72=15         Sets 28.8Kbps speed.

  S72=16         Sets 38.4Kbps speed.

  S72=17         Sets 57.6Kbps speed.

  S72=18         Sets 115.2Kbps speed.

                             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            Maximum MNP block size is 64 characters.

  \A1            Maximum MNP block size is 128 characters.

  \A2            Maximum MNP block size is 192 characters.

   \A3          Maximum MNP block size is 256 characters.

  \A4            Maximum MNP block size is 32 characters.

                                MNP OPTIONS

  Format              AT [cmds] S59=n [cmds]

  Example:            AT S59=0 <CR>

  Default:            1

  Range:              0 - 1

  Unit:               Bit-mapped

  Description:        Selects MNP5 status.

     Bit       Value                        Function

      0        0        Data compression disabled.

                1      Data compression enabled.

                           MODEM OPERATING MODE

  Type:          Configuration

  Format:        AT [cmds] S53=n [cmds]

  Example:       AT S53=3 <CR>

  Description:   Sets connect mode.

  Command                                Function

  S53=0          Normal mode enabled.

  S53=1          Direct mode enabled.

  S53=2          MNP reliable mode enabled.

   S53=3        LAP-M, MNP, or Normal mode enabled.

  S53=4          LAP-M mode with fallback to MNP enabled.

  S53=5          LAP-M mode enabled.

                              PROTOCOL/SPEED

  Type:          Register

  Format:        AT [cmds] S37n [cmds]

  Example:       AT S37=0 <CR>

  Description:   Selects the current DCE speed.

    Command                              Function

     S37=0       Select last ATspeed.

     S37=3       Select 300bps speed.

     S37=5       Select 1200bps speed.

     S37=6       Select 2400bps speed.

     S37=7       Select 4800bps speed.

     S37=8       Select 7200bps speed.

     S37=9       Select 9600bps speed.

     S37=10      Select 12Kbps speed.

     S37=11      Select 14.4Kbps speed.

     S37=12      Select 16.8Kbps speed.

     S37=13      Select 19.2Kbps speed.

     S37=14      Select 21.6Kbps speed.

     S37=15      Select 24Kbps speed.

     S37=16      Select 26.4Kbps speed.

     S37=17      Select 28.8Kbps speed.

                           PROTOCOL RESULT CODE

  Type:          Configuration

  Format:        AT [cmds] \Vn [cmds]

  Example:       AT \V0 Q0 <CR>

  Description:   \V responds when conjunction with W0 and W2 commands.

  Command                                Function

  \V1            Protocol result code disabled.

   \V0          Protocol result code enabled.

                               ROOT FIRMWARE

  Type:          Configuration

  Format:        AT [cmds] -V [cmds]

  Example:       AT -V &W<CR>

  Description:   Displays base firmware version information.

                             ROUND TRIP DELAY

  Type:          Register

  Format:        AT [cmds] S65=n [cmds]

  Example:       AT S65=1 <CR>

  Default:       Unidentified

  Range:         Unidentified

  Unit:          100 ms

  Description:   Sets the round trip delay.

                                TEST MODES

  Format                  AT [cmds] S16=n [cmds]

  Example:                ATS16=40<CR>

  Default:                0

  Range:                  0-127

  Unit:                   Bit-mapped

  Description:            Controls loopback tests, analog, digital,
                          remote digital, and self tests.

      Bit         Value                        Function

       0          0         Local analog loopback not in progress.

                 1           Local analog loopback in progress.

       1         0           Not used.

       2          0         Local digital loopback not in progress.

                 1           Local digital loopback in progress.

       3          0         Modem not in remote digital loopback.

                 1           Remote digital loopback in progress.

       4          0         Remote digital loopback not requested.

                 1           Remote digital loopback requested.

       5          0         Remote digital loopback with self-test not
                             in progress.
                 1
                             Remote digital loopback with self-test in
                             progress.

       6          0         Local analog loopback with self-test not in
                             progress.
                 1
                             Local analog loopback with self-test in
                             progress.

                             V.32 AUTO-RETRAIN

  Type:            Configuration

  Format:          AT [cmds] &Bn [cmds]

  Example:         AT &B1 &W<CR>

  Description:     Selects action the modem will take during bad line
                   quality on V.32/32bis connection.

  Command                                Function

       %B0         Auto-retrain disabled, hang up.

       %B1         Auto-retrain on line quality problem enabled; Hang-up
                   after S7 threshold exceeded.

       %B2         Modem ignores line quality problems.

                               V.32 RETRAIN

  Type:            Register

  Format:          AT [cmds] S42=n [cmds]

  Example:         AT S42=1 <CR>

  Default:         1

  Range:           0 - 2

  Unit:            Bit-mapped

  Description:     Selects action the modem will take during bad line
                   quality on V.32/32bis connection.

  Command                                Function

  S42=0            Auto-retrain disabled, hang up.

   S42=1          Auto-retrain on line quality problem enabled.

  S42=2            Modem ignores line quality problems.

                           V.42 DETECTION PHASE

  Type:          Configuration

  Format:        AT [cmds] -Jn [cmds]

  Example:       AT -J1 &W<CR>

  Description:   Controls V.42 detection.

  Command                                Function

  -J0            V.42 detection disabled.

   -J1          V.42 detection enabled.

                        V.42bis COMPRESSION CONTROL

  Type:          Configuration

  Format:        AT [cmds] "Hn [cmds]

  Example:       AT "H3 &W<CR>

  Description:   Controls V.42bis data compression

  Command                                Function

  "H0            V.42bis disabled.

  "H1            V.42bis when transmitting enabled.

  "H2            V.42bis when receiving enabled.

   "H3          V.42bis when transmitting/receiving enabled.

                          V.42bis DICTIONARY SIZE

  Type:          Configuration

  Format:        AT [cmds] "Nn [cmds]

  Example:       AT "N2 &W<CR>

  Description:   Controls V.42 dictionary size.

  Command                                Function

  "N0            512 bytes.

  "N1            1024 bytes.

   "N2          1536 bytes.

                          V.42bis DICTIONARY SIZE

  Type:          Register

  Format:        AT [cmds] S57=n [cmds]

  Example:       AT S57=2 <CR>

  Description:   Selects V.42bis dictionary size.

  Command                                Function

  S57=0          512 bytes.

  S57=1          1024 bytes.

   S57=2        1536 bytes.

                       V.42bis MAXIMUM STRING LENGTH

  Type:          Immediate

  Format:        AT [cmds] "O=n [cmds]

  Example:       AT "O=32 <CR>

  Default:       32

  Range:         6 - 64

  Unit:          Unidentified

  Description:   Selects string size for V.42bis compression.

                           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.

