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       # PARADYNE CORPORATION
       
          COMSPHERE 3830
       
          Modem Type             Data (synchronous/asynchronous)/Fax     
          Maximum Data Rate      19.2Kbps                                
          Maximum Fax Rate       14.4Kbps                                
          Data Bus               External                                
          Fax Class              Class I & II                            
          Data Modulation        AT&T V.32terbo                          
          Protocol                                                       
                                 Bell 103A/212A                          
                                                                         
                                 ITU-T V.21, V.22, V.22bis, V.32,        
                                 V.32bis                                 
          Fax Modulation         ITU-T V.17, V.27ter, V.29               
          Protocol               
          Error                  MNP5, V.42, V.42bis                     
          Correction/Compression 
       
 (IMG) IMG 1
          
       
           
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |     Purpose      | Location |      Purpose      | Location |
          |------------------+----------+-------------------+----------|
          | Line out         |   CN1    | DC power          |   CN4    |
          |------------------+----------+-------------------+----------|
          | Line in          |   CN2    | Power switch      |   SW1    |
          |------------------+----------+-------------------+----------|
          | RS-232/422       |   CN3    |                   |          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          |   LED   | Color  |  Status  |          Condition           |
          |---------+--------+----------+------------------------------|
          |   PWR   | Green  |    On    |         Power is on          |
          |---------+--------+----------+------------------------------|
          |   PWR   | Green  |   Off    |         Power is off         |
          |---------+--------+----------+------------------------------|
          |  ALRM   |  Red   | Blinking |     Internal malfunction     |
          |         |        |          |           detected           |
          |---------+--------+----------+------------------------------|
          |  ALRM   |  Red   |   Off    |       Normal operation       |
          |---------+--------+----------+------------------------------|
          |   OH    | Green  |    On    |      Modem is off-hook       |
          |---------+--------+----------+------------------------------|
          |   OH    | Green  |   Off    |       Modem is on-hook       |
          |---------+--------+----------+------------------------------|
          | DTR/108 | Green  |    On    |      DTR signal is high      |
          |---------+--------+----------+------------------------------|
          | DTR/108 | Green  |   Off    |      DTR signal is low       |
          |---------+--------+----------+------------------------------|
          | RTS/105 | Green  |    On    |      RTS signal is high      |
          |---------+--------+----------+------------------------------|
          | RTS/105 | Green  |   Off    |      RTS signal is low       |
          |---------+--------+----------+------------------------------|
          | CTS/106 | Green  |    On    |      CTS signal is high      |
          |---------+--------+----------+------------------------------|
          | CTS/106 | Green  |   Off    |      CTS signal is low       |
          |---------+--------+----------+------------------------------|
          | TXD/103 | Green  |    On    |  Modem is transmitting data  |
          |---------+--------+----------+------------------------------|
          | TXD/103 | Green  |   Off    |  Modem is not transmitting   |
          |         |        |          |             data             |
          |---------+--------+----------+------------------------------|
          | LSD/109 | Green  |    On    |   Carrier signal detected    |
          |---------+--------+----------+------------------------------|
          | LSD/109 | Green  |   Off    | Carrier signal not detected  |
          |---------+--------+----------+------------------------------|
          | RXD/104 | Green  |    On    |   Modem is receiving data    |
          |---------+--------+----------+------------------------------|
          | RXD/104 | Green  |   Off    | Modem is not receiving data  |
          |---------+--------+----------+------------------------------|
          |   SQ    | Yellow |    On    | Incoming signal is degraded  |
          |---------+--------+----------+------------------------------|
          |   SQ    | Yellow |   Off    |       Normal operation       |
          |---------+--------+----------+------------------------------|
          |   EC    | Green  |    On    |   Error correction enabled   |
          |---------+--------+----------+------------------------------|
          |   EC    | Green  |   Off    |  Error correction disabled   |
          |---------+--------+----------+------------------------------|
          |  RATE   | Yellow |    On    |  Modem is connected at less  |
          |         |        |          |    than configured speed     |
          |---------+--------+----------+------------------------------|
          |  RATE   | Yellow |   Off    |    Modem is connected at     |
          |         |        |          |       configured speed       |
          |---------+--------+----------+------------------------------|
          |   AT    | Yellow |    On    |   AT command set disabled    |
          |---------+--------+----------+------------------------------|
          |   AT    | Yellow |   Off    |    AT command set enabled    |
          |---------+--------+----------+------------------------------|
          |   AT    | Yellow | Blinking |   AT command set partially   |
          |         |        |          |      enabled (see S84)       |
          +------------------------------------------------------------+
       
                            Proprietary AT Command Set
       
          +------------------------------------------------------------+
          |                    AT COMMAND RESPONSE                     |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S84=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S84=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Sets the response to AT commands.           |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S84=0    | Normal operation                            |
          |--------------+---------------------------------------------|
          |    S84=1     | Execute valid commands, suppress error      |
          |              | codes.                                      |
          |--------------+---------------------------------------------|
          |    S84=2     | Ignore configuration commands, always       |
          |              | return OK error code.                       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        AUTO REDIAL                         |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S37=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | ATS37=6<CR>                                 |
          |--------------+---------------------------------------------|
          | Default:     | Unidentified.                               |
          |--------------+---------------------------------------------|
          | Unit:        | 1 stored number.                            |
          |--------------+---------------------------------------------|
          | Description: | Redial from a list of stored numbers        |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    S36=0     | Dial stored number 1                        |
          |--------------+---------------------------------------------|
          |    S36=1     | Dial stored numbers 1-2.                    |
          |--------------+---------------------------------------------|
          |    S36=2     | Dial stored numbers 1-3.                    |
          |--------------+---------------------------------------------|
          |    S36=3     | Dial stored numbers 1-4.                    |
          |--------------+---------------------------------------------|
          |    S36=4     | Dial stored numbers 1-5.                    |
          |--------------+---------------------------------------------|
          |    S36=5     | Dial stored numbers 1-6                     |
          |--------------+---------------------------------------------|
          |    S36=6     | Dial stored numbers 1-7.                    |
          |--------------+---------------------------------------------|
          |    S36=7     | Dial stored numbers 1-8.                    |
          |--------------+---------------------------------------------|
          |    S36=8     | Dial stored numbers 1-9.                    |
          |--------------+---------------------------------------------|
          |    S36=9     | Dial stored numbers 1-10.                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |              AUTO-RELIABLE FALLBACK CHARACTER              |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %An [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT%A20<CR>                                  |
          |--------------+---------------------------------------------|
          | Default:     | 19                                          |
          |--------------+---------------------------------------------|
          | 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                   |
          |--------------+---------------------------------------------|
          |    í \CO     | Data is discarded.                          |
          |--------------+---------------------------------------------|
          |     \C1      | Data is buffered.                           |
          |--------------+---------------------------------------------|
          |     \C2      | Data is discarded, resets to \C1 on receipt |
          |              | of autoreliable fallback character.         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         BREAK TYPE                         |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Kn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \K5 &W<CR>                               |
          |--------------+---------------------------------------------|
          | Description: | Selects response to DTE break command.      |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     \K0      | Send break, clear buffer, enter command     |
          |              | mode.                                       |
          |--------------+---------------------------------------------|
          |     \K1      | Send break, clear buffer                    |
          |--------------+---------------------------------------------|
          |     \K2      | Send break, send data, enter command mode.  |
          |--------------+---------------------------------------------|
          |     \K3      | Send break. send data,                      |
          |--------------+---------------------------------------------|
          |     \K4      | Send data, send break, enter command mode.  |
          |--------------+---------------------------------------------|
          |    í \K5     | Send data, send break.                      |
          |--------------+---------------------------------------------|
          |     \K6      | Disabled.                                   |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    BUSY OUT ON LOW DTR                     |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S69=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S69=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Modem goes off hook on low DTR.             |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S69=0    | Busy out disabled.                          |
          |--------------+---------------------------------------------|
          |    S699=1    | Busy out enabled.                           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CALLBACK STORED NUMBER                   |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S67=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S67=0<CR>                                |
          |--------------+---------------------------------------------|
          | Description: | Callback function will dial the number      |
          |              | stored in memory location 1.                |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S67=0    | Disabled.                                   |
          |--------------+---------------------------------------------|
          |    S67=1     | Enabled.                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CELLULAR ENHANCEMENT                    |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S91=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S91=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Adjusts profile to improve cellular         |
          |              | performance                                 |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S91=0    | Disabled.                                   |
          |--------------+---------------------------------------------|
          |    S91=1     | Enabled.                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         CD SIGNAL                          |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Cn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT &C3 <CR>                                 |
          |--------------+---------------------------------------------|
          | Description: | Configures the behavior of the carrier      |
          |              | detect signal.                              |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     &C0      | CD forced high.                             |
          |--------------+---------------------------------------------|
          |    í &C1     | CD normal.                                  |
          |--------------+---------------------------------------------|
          |     &C2      | CD forced high except during handshaking    |
          |              | and disconnecting.                          |
          |--------------+---------------------------------------------|
          |     &C3      | CD momentary interrupt on disconect.        |
          |--------------+---------------------------------------------|
          |     &C4      | CD follows remote RTS signal.               |
          |--------------+---------------------------------------------|
          |     &C5      | CD Follows DTR signal. Forced low on        |
          |              | disconnect.                                 |
          |--------------+---------------------------------------------|
          |     &C6      | CD forced low on retrain of over 10 sec.    |
          |              | Forced high after no retrain for over 10    |
          |              | sec.                                        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        COMPRESSION                         |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] %Cn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT &B1 %C1 &I<CR>                           |
          |--------------+---------------------------------------------|
          | Description: | Selects data compression.                   |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     %C0      | Data compression disabled.                  |
          |--------------+---------------------------------------------|
          |    í %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 mode only enabled.                      |
          |--------------+---------------------------------------------|
          |     \N3      | MNP mode with fallback to normal mode       |
          |              | enabled.                                    |
          |--------------+---------------------------------------------|
          |     \N4      | V.42/MNP mode only enabled.                 |
          |--------------+---------------------------------------------|
          |    í \N5     | V.42/MNP mode with fallback to normal mode  |
          |              | enabled.                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         CTS SIGNAL                         |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Dn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \D0<CR>                                  |
          |--------------+---------------------------------------------|
          | Description: | Selects the function of the CTS signal.     |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    í \D0     | CTS forced high.                            |
          |--------------+---------------------------------------------|
          |     \D1      | CTS normal.                                 |
          |--------------+---------------------------------------------|
          |     \D2      | CTS interrupted for 2 seconds on            |
          |              | disconnect.                                 |
          |--------------+---------------------------------------------|
          |     \D3      | CTS follows DTR.                            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    DIAL TYPE SELECTION                     |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] &Jn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT &J0 D555-1212<CR>                        |
          |--------------+---------------------------------------------|
          | Description: | Sets transmit signal level.                 |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    í &J0     | Permissive -9dBm                            |
          |--------------+---------------------------------------------|
          |     &J1      | Programmable                                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  DISCONNECT BUFFER DELAY                   |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S39=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S39=0<CR>                                |
          |--------------+---------------------------------------------|
          | Default:     | Unidentified                                |
          |--------------+---------------------------------------------|
          | Range:       | 0-255                                       |
          |--------------+---------------------------------------------|
          | Unit:        | 1 second                                    |
          |--------------+---------------------------------------------|
          | Description: | Configures how long the modem will wait to  |
          |              | disconnect if there is data in the transmit |
          |              | or receive buffers.                         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   DISCONNECT IMMEDIATELY                   |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S85=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S85=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Disconnect immediately on receipt of        |
          |              | disconnect signal from DTE or diagnostic    |
          |              | control panel.                              |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S85=0    | Disabled.                                   |
          |--------------+---------------------------------------------|
          |    S85=1     | Enabled.                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   DISCONNECT INACTIVITY                    |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S80=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S80=3 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Sets the signal monitored by the inactivity |
          |              | timer (\T).                                 |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    S80=0     | Transmit or receive.                        |
          |--------------+---------------------------------------------|
          |    S80=1     | Transmit only.                              |
          |--------------+---------------------------------------------|
          |    S80=2     | Receive only.                               |
          |--------------+---------------------------------------------|
          |   í S80=3    | Transmit and receive.                       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               DISCONNECT ON LOSS OF CURRENT                |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S65=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S65=0<CR>                                |
          |--------------+---------------------------------------------|
          | Description: | Causes the modem to disconnect if the       |
          |              | telephone line’s current drops.             |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S65=0    | Disconnect after 8ms if current is lost.    |
          |--------------+---------------------------------------------|
          |    S65=1     | Disconnect after 90ms if current is lost.   |
          |--------------+---------------------------------------------|
          |    S65=2     | Disabled                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      DTE RATE CONTROL                      |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S61=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S61= &W<CR>                              |
          |--------------+---------------------------------------------|
          | Description: | Sets result of DTE CT111 rate control       |
          |              | signal.                                     |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S61=0    | Disabled.                                   |
          |--------------+---------------------------------------------|
          |    S61=-1    | Fallback 1.                                 |
          |--------------+---------------------------------------------|
          |    S61=2     | Fallback 2.                                 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         DTR ALARM                          |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S77=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S77=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Sends alarm to proprietary Series           |
          |              | Management Controller if DTR low for 10     |
          |              | seconds.                                    |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S77=0    | Alarm disabled.                             |
          |--------------+---------------------------------------------|
          |    S77=1     | Alarm enabled.                              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      FACTORY DEFAULTS                      |
          |------------------------------------------------------------|
          | Type:        | Immediate/Configuration                     |
          |--------------+---------------------------------------------|
          | Format:      | AT &Fn                                      |
          |--------------+---------------------------------------------|
          | Example:     | AT &F0<CR>                                  |
          |--------------+---------------------------------------------|
          | Description: | Loads factory defaults to NVRAM.            |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     &F0      | Asynchronous dial.                          |
          |--------------+---------------------------------------------|
          |     &F3      | UNIX dial.                                  |
          |--------------+---------------------------------------------|
          |     &F5      | Cellular (Mobile). Load \A4, \N4, S0=3,     |
          |              | S7=120, S10=100, S43=1, S76=3, S89=9,       |
          |              | S91=1.                                      |
          |--------------+---------------------------------------------|
          |     &F6      | Cellular (PSTN). Load &I100, \N4, S7=120,   |
          |              | S10=100, S43=1, S89=9, S91=1                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        FLOW CONTROL                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \Gn [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \G1 &K3<CR>                              |
          |--------------+---------------------------------------------|
          | Description: | Selects modem port flow control.            |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    í \G0     | Flow control disabled.                      |
          |--------------+---------------------------------------------|
          |     \G1      | Flow control enabled.                       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     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.                                    |
          |--------------+---------------------------------------------|
          |    í \Q2     | CTS flow control by DCE enabled.            |
          |--------------+---------------------------------------------|
          |     \Q3      | Bidirectional CTS/RTS flow control enabled. |
          |--------------+---------------------------------------------|
          |     \Q4      | XON/XOFF flow control by DCE enabled.       |
          |--------------+---------------------------------------------|
          |     \Q5      | XON/XOFF flow control by DTE enabled.       |
          |--------------+---------------------------------------------|
          |     \Q6      | RTS flow control by DTE enabled.            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     HANDSHAKE OPTIONS                      |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S43=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S43=0 <CR>                               |
          |--------------+---------------------------------------------|
          | Default:     | 0                                           |
          |--------------+---------------------------------------------|
          | Range:       | 0, 1                                        |
          |--------------+---------------------------------------------|
          | Description: | Controls the V.32bis handshake sequence.    |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S43=0    | V.32bis long handshake.                     |
          |--------------+---------------------------------------------|
          |    S43=1     | V.32is short handshake.                     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      INACTIVITY TIMER                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | 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.                                |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     LAP-M FRAME SIZE4                      |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] \An [cmds]                        |
          |--------------+---------------------------------------------|
          | Example:     | AT \A3 %C1<CR>                              |
          |--------------+---------------------------------------------|
          | Description: | Sets the maximum frame size for V.42 and    |
          |              | MNP connections.                            |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |     \A0      | Maximum frame size is 64                    |
          |--------------+---------------------------------------------|
          |     \A1      | Maximum frame size is 128                   |
          |--------------+---------------------------------------------|
          |     \A2      | Maximum frame size is 192                   |
          |--------------+---------------------------------------------|
          |     \A3      | Maximum frame size is 256                   |
          |--------------+---------------------------------------------|
          |     \A4      | Maximum frame size is 32                    |
          |--------------+---------------------------------------------|
          |     \A5      | Maximum frame size is 16                    |
          |------------------------------------------------------------|
          | Note: Maximum V.42 frame size is 128.                      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     LAP-M FRAME WINDOW                     |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S89=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | ATS89=6<CR>                                 |
          |--------------+---------------------------------------------|
          | Default:     | 0                                           |
          |--------------+---------------------------------------------|
          | Range:       | 1-9                                         |
          |--------------+---------------------------------------------|
          | Unit:        | 1 frame (beginning with 0=6 frames)         |
          |--------------+---------------------------------------------|
          | Description: | Sets the number of frames used in V.42 and  |
          |              | V.42bis transmissions                       |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  LEASED LINE AUTO-RETRAIN                  |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S82=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S82=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Allows modem to retrain to compensate for   |
          |              | bad line quality.                           |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S82=0    | Retrain enabled.                            |
          |--------------+---------------------------------------------|
          |    S82=1     | Retrain disabled.                           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     LEASED LINE SPEED                      |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S44=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | ATS44=6<CR>                                 |
          |--------------+---------------------------------------------|
          | Default:     | 18                                          |
          |--------------+---------------------------------------------|
          | Description: | Sets maximum leased line speed              |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    S44=0     | 14.4Kbps V.32bis                            |
          |--------------+---------------------------------------------|
          |    S44=1     | 14.4Kbps V.32bis                            |
          |--------------+---------------------------------------------|
          |    S44=2     | 12.0Kbps V.32bis                            |
          |--------------+---------------------------------------------|
          |    S44=3     | 9600bps V.32bis                             |
          |--------------+---------------------------------------------|
          |    S44=4     | 7200bps V.32bis                             |
          |--------------+---------------------------------------------|
          |    S44=5     | 4800bps V.32bis                             |
          |--------------+---------------------------------------------|
          |    S44=6     | 2400bps V.22bis                             |
          |--------------+---------------------------------------------|
          |   í S44=18   | 19.2Kbps V.32terbo                          |
          |--------------+---------------------------------------------|
          |    S44=19    | 16.8bps V.32terbo                           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               LEASED LINE TRANSMISSION LEVEL               |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S45=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S45=15<CR>                               |
          |--------------+---------------------------------------------|
          | Default:     | 0                                           |
          |--------------+---------------------------------------------|
          | Range:       | 0 - 15                                      |
          |--------------+---------------------------------------------|
          | Unit:        | 1 dBm                                       |
          |--------------+---------------------------------------------|
          | Description: | Sets the signal level for transmission when |
          |              | in leased line mode.                        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                         LINE SPEED                         |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S41=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | ATS41=6<CR>                                 |
          |--------------+---------------------------------------------|
          | Default:     | 20                                          |
          |--------------+---------------------------------------------|
          | Description: | Sets maximum line speed                     |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |    S41=1     | 14.4Kbps V.32bis                            |
          |--------------+---------------------------------------------|
          |    S41=2     | 12.0Kbps V.32bis                            |
          |--------------+---------------------------------------------|
          |    S41=3     | 9600bps V.32bis, V.32                       |
          |--------------+---------------------------------------------|
          |    S41=4     | 7200bps V.32bis                             |
          |--------------+---------------------------------------------|
          |    S41=5     | 4800bps V.32bis, V.32                       |
          |--------------+---------------------------------------------|
          |    S41=6     | 2400bps V.22bis                             |
          |--------------+---------------------------------------------|
          |    S41=7     | 1200bps V.22                                |
          |--------------+---------------------------------------------|
          |    S41=8     | 1200bps 212A                                |
          |--------------+---------------------------------------------|
          |    S41=10    | 0-300bps V21                                |
          |--------------+---------------------------------------------|
          |    S41=11    | 0-300bps 103J                               |
          |--------------+---------------------------------------------|
          |    S41=12    | 1200/75bps V.23                             |
          |--------------+---------------------------------------------|
          |    S41=13    | 75/1200bps V.23                             |
          |--------------+---------------------------------------------|
          |   í S41=20   | 19.2Kbps V.32terbo                          |
          |--------------+---------------------------------------------|
          |    S41=21    | 16.8bps V.32terbo                           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   LOCAL ANALOG LOOPBACK                    |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S52=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S52=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Modem executes local analog loopback on     |
          |              | receipt of CT141 signal from DTE            |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S52=0    | Loopback disabled.                          |
          |--------------+---------------------------------------------|
          |    S52=1     | Loopback enabled.                           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      LOCK SERIAL PORT                      |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S90=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S90=0<CR>                                |
          |--------------+---------------------------------------------|
          | Description: | Sets operation of serial port speed.        |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S90=0    | Disabled.                                   |
          |--------------+---------------------------------------------|
          |    S90=1     | Serial speed follows connect speed.         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                           MI/MIC                           |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S83=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S83=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Configures the Mode Indicate/Mode Indicate  |
          |              | Common (MI/MIC) interface.                  |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S83=0    | Disabled.                                   |
          |--------------+---------------------------------------------|
          |    S83=1     | Enabled.                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    REMOTE CONFIGURATION                    |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S55=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S55=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Allows remote configuration by 3800 series  |
          |              | modem.                                      |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S55=0    | Remote configuration enabled.               |
          |--------------+---------------------------------------------|
          |    S55=1     | Remote configuration disabled.              |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  REMOTE DIGITAL LOOPBACK                   |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S51=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S51=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Modem executes remote digital loopback on   |
          |              | receipt of CT140 signal from DTE            |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S51=0    | Loopback disabled.                          |
          |--------------+---------------------------------------------|
          |    S51=1     | Loopback enabled.                           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     REPORT INFORMATION                     |
          |------------------------------------------------------------|
          | Type:        | Immediate                                   |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] In [cmds]                         |
          |--------------+---------------------------------------------|
          | Example:     | AT &C1 I1 B1<CR>                            |
          |--------------+---------------------------------------------|
          | Description: | Displays modem properties.                  |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      I0      | Display product code.                       |
          |--------------+---------------------------------------------|
          |      I1      | Display 3 digit firmware revision number.   |
          |--------------+---------------------------------------------|
          |      I2      | Reports current EPROM checksum.             |
          |--------------+---------------------------------------------|
          |      I3      | Display serial number.                      |
          |--------------+---------------------------------------------|
          |      I4      | Display model number.                       |
          |--------------+---------------------------------------------|
          |      I5      | Display hardware part number.               |
          |--------------+---------------------------------------------|
          |      I6      | Display software part number.               |
          |--------------+---------------------------------------------|
          |      I9      | Display 3 digit firmware revision number.   |
          |--------------+---------------------------------------------|
          |     I10      | Changes value displayed by I0               |
          |--------------+---------------------------------------------|
          |   í I10=0    | Display 144                                 |
          |--------------+---------------------------------------------|
          |    I10=1     | Display 240                                 |
          |--------------+---------------------------------------------|
          |    I10=2     | Display 480                                 |
          |--------------+---------------------------------------------|
          |    I10=3     | Display 960                                 |
          |--------------+---------------------------------------------|
          |    I10=4     | Display 120                                 |
          |--------------+---------------------------------------------|
          |     I11      | Reports RAM checksum result.                |
          |--------------+---------------------------------------------|
          |     !19      | Display complete firmware revision number.  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               RESET MODEM TO STORED PROFILE                |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Zn [cmds]                         |
          |--------------+---------------------------------------------|
          | Example:     | AT Z0<CR>                                   |
          |--------------+---------------------------------------------|
          | Description: | Restores modem profiles previously saved in |
          |              | non-volatile RAM using the &W command.      |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      Z0      | Restore profile 0.                          |
          |--------------+---------------------------------------------|
          |      Z1      | Restore profile 1.                          |
          |--------------+---------------------------------------------|
          |      Z2      | Restore profile 2.                          |
          |--------------+---------------------------------------------|
          |      Z3      | Restore profile 3.                          |
          |--------------+---------------------------------------------|
          |      Z9      | Restore factory defaults and use them as    |
          |              | power-on defaults.                          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                        RESULT CODES                        |
          |------------------------------------------------------------|
          | Type:        | Configuration                               |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] Xn [cmds]                         |
          |--------------+---------------------------------------------|
          | Example:     | AT X5 &W<CR>                                |
          |--------------+---------------------------------------------|
          | Description: | Enables extended result codes, EC and V.42, |
          |              | MNP suffix, dial tone and busy signal       |
          |              | detect                                      |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |      X0      | Disabled.                                   |
          |--------------+---------------------------------------------|
          |      X1      | Enable extended result codes.               |
          |--------------+---------------------------------------------|
          |      X2      | Enable extended result codes and dial tone  |
          |              | detect.                                     |
          |--------------+---------------------------------------------|
          |      X3      | Enable extended result codes and busy       |
          |              | signal detect                               |
          |--------------+---------------------------------------------|
          |     í X4     | Enable extended result codes, dial tone     |
          |              | detect and busy signal detect               |
          |--------------+---------------------------------------------|
          |      X5      | Enable extended result codes, EC suffix,    |
          |              | dial tone detect and busy signal detect     |
          |--------------+---------------------------------------------|
          |      X6      | Enable extended result codes, V.42, MNP     |
          |              | suffix, dial tone detect and busy signal    |
          |              | detect                                      |
          |--------------+---------------------------------------------|
          |      X7      | Display DTE rate. Enable dial tone detect   |
          |              | and busy signal detect                      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    RJ11 CELLULAR ADAPT                     |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S93=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S93=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Adds support or RJ11 connection during      |
          |              | cellular operation                          |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S93=0    | Disabled.                                   |
          |--------------+---------------------------------------------|
          |    S93=1     | Enabled.                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                       STORED PROFILE                       |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S88=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S88=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Loads stored profile on disconnect.         |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S88=0    | Disabled.                                   |
          |--------------+---------------------------------------------|
          |   S88=231    | Disabled.                                   |
          |--------------+---------------------------------------------|
          |    S88=1     | Enabled.                                    |
          |--------------+---------------------------------------------|
          |   S88=232    | Enabled.                                    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     TRANSMISSION LEVEL                     |
          |------------------------------------------------------------|
          | Type:         | Configuration                              |
          |---------------+--------------------------------------------|
          | Format:       | AT [cmds] &In [cmds]                       |
          |---------------+--------------------------------------------|
          | Example:      | AT &I26 &W<CR>                             |
          |---------------+--------------------------------------------|
          | Default:      | 0                                          |
          |---------------+--------------------------------------------|
          | Range:        | 10-32, 99, 100                             |
          |---------------+--------------------------------------------|
          | Unit:         | -1 dBm                                     |
          |---------------+--------------------------------------------|
          | Description:  | Sets the signal level for transmission     |
          |------------------------------------------------------------|
          | Note: Set to 99 for autoadjust ETC1.0 specification. Set   |
          | to 100 for autoadjust ETC1.1 specification                 |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                      V.25bis CODE SET                      |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S62=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S62=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Sets coding type used in V.25bis mode.      |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S62=0    | ASCII                                       |
          |--------------+---------------------------------------------|
          |    S62=1     | EBCDIC                                      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 V.25bis NEW LINE CHARACTER                 |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S64=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S64=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Sets V.25 new line character.               |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S64=0    | Carriage return and line feed.              |
          |--------------+---------------------------------------------|
          |    S64=1     | Carriage return.                            |
          |--------------+---------------------------------------------|
          |    S64=2     | Line feed.                                  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    V.32bis AUTO-RETRAIN                    |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S76=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S76=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Selects action the modem will take during   |
          |              | bad line quality on 32bis connection.       |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S76=0    | Auto retrain enabled.                       |
          |--------------+---------------------------------------------|
          |    S76=1     | Auto retrain disabled.                      |
          |--------------+---------------------------------------------|
          |    S76=2     | Auto retrain started at 4800bps.            |
          |--------------+---------------------------------------------|
          |    S76=3     | Auto retrain started at 9600bps             |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    V.32bis/PBX AUTOMODE                    |
          |------------------------------------------------------------|
          | Type:        | Register                                    |
          |--------------+---------------------------------------------|
          | Format:      | AT [cmds] S78=n [cmds]                      |
          |--------------+---------------------------------------------|
          | Example:     | AT S78=0 &W<CR>                             |
          |--------------+---------------------------------------------|
          | Description: | Selects allowed modulations.                |
          |--------------+---------------------------------------------|
          |   Command    |                  Function                   |
          |--------------+---------------------------------------------|
          |   í S78=0    | Use any supported modulation.               |
          |--------------+---------------------------------------------|
          |    S78=1     | Use modulation specified in S41             |
          |--------------+---------------------------------------------|
          |    S78=2     | Use PBX modulation.                         |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                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.             |
          |--------------+---------------------------------------------|
          |    í "H3     | V.42bis when transmitting/receiving         |
          |              | 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                   |
          |--------------+---------------------------------------------|
          |    í \X0     | XON/XOFF signals trapped by local modem.    |
          |--------------+---------------------------------------------|
          |     \X1      | XON/XOFF passed through local modem.        |
          +------------------------------------------------------------+