3COM CORPORATION
================

   IMPACT (3C872, 3C877)

   Card Type              ISDN TA, modem (asynchronous)           
   I/O Options            Analog adapter (optional)               
   Chipset                Unidentified                            
   Maximum Data Rate      14.4Kbps                                
   Maximum Fax Rate       14.4Kbps                                
   Fax Class              Unidentified                            
   Data Modulation        Bell 103A, 212A                         
   Protocol                                                       
                          ITU-T V.21, V.22, V.22bis, V.23, V.32,  
                          V.32bis                                 
   Fax Modulation         Unidentified                            
   Protocol               
   Error                  MNP5, MNP10, V.42, V.42bis, STAC        
   Correction/Compression 
   ISDN Transfer Rate     56Kbps x 2/64Kbps x 2                   
   ISDN Protocol          V.120, PPP                              
   Switch Type            5ESS, DMS100, EWSD, NI-1                
   Data Bus               Serial                                  

<gopher://bitreich.org/I/th99/t/0-9/53736-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |       Function        | Label  |   Function    |   Label   |
   |------------------------------------------------------------|
   | ISDN interface             |   CN1   | Serial port  | CN4  |
   |----------------------------+---------+--------------+------|
   | Analog adapter             |   CN2   | AC power in  | CN5  |
   |----------------------------+---------+--------------+------|
   | Serial port                |   CN3   | Power switch | SW1  |
   |------------------------------------------------------------|
   |      Note: CN2 may not be present on all models.           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED | Color  |  Status  |            Condition             |
   |-----+--------+----------+----------------------------------|
   | B2  | Green  |    On    |    Data call connected on B2     |
   |     |        |          |             channel              |
   |-----+--------+----------+----------------------------------|
   | B2  | Yellow |    On    |    Voice call connected on B2    |
   |     |        |          |             channel              |
   |-----+--------+----------+----------------------------------|
   | B2  | Green  | Blinking |  TA is dialing data call on B2   |
   |     |        |          |             channel              |
   |-----+--------+----------+----------------------------------|
   | B2  | Yellow | Blinking |  TA is dialing voice call on B2  |
   |     |        |          |             channel              |
   |-----+--------+----------+----------------------------------|
   | B2  |  N/A   |   Off    |   B2 channel is not connected    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DIAGNOSTIC LED(S) (CON'T)                  |
   |------------------------------------------------------------|
   |  LED  | Color  |  Status  |           Condition            |
   |-------+--------+----------+--------------------------------|
   |  B1   | Green  |    On    |   Data call connected on B1    |
   |       |        |          |            channel             |
   |-------+--------+----------+--------------------------------|
   |  B1   | Yellow |    On    |   Voice call connected on B1   |
   |       |        |          |            channel             |
   |-------+--------+----------+--------------------------------|
   |  B1   | Green  | Blinking | TA is dialing data call on B1  |
   |       |        |          |            channel             |
   |-------+--------+----------+--------------------------------|
   |  B1   | Yellow | Blinking | TA is dialing voice call on B1 |
   |       |        |          |            channel             |
   |-------+--------+----------+--------------------------------|
   |  B1   |  N/A   |   Off    |  B1 channel is not connected   |
   |-------+--------+----------+--------------------------------|
   |   D   | Yellow |    On    | Signal is not synchronized or  |
   |       |        |          |   ISDN line is not connected   |
   |-------+--------+----------+--------------------------------|
   |   D   | Yellow | Blinking |   Signal is synchronized but   |
   |       |        |          |    D-channel protocols not     |
   |       |        |          |          established           |
   |-------+--------+----------+--------------------------------|
   |   D   | Yellow |   Off    |     Signal is synchronized     |
   |-------+--------+----------+--------------------------------|
   | TEST  | Yellow |    On    |      TA failed last test       |
   |-------+--------+----------+--------------------------------|
   | TEST  | Yellow | Blinking |      TA is executing test      |
   |-------+--------+----------+--------------------------------|
   | TEST  | Yellow |   Off    |    TA is not executing test    |
   |-------+--------+----------+--------------------------------|
   | POWER | Yellow |    On    |          Power is on           |
   |-------+--------+----------+--------------------------------|
   | POWER | Yellow |   Off    |          Power is off          |
   +------------------------------------------------------------+

   +--------------------------------------------------------+
   |              SUPPORTED STANDARD COMMANDS               |
   |--------------------------------------------------------|
   |                   Basic AT Commands                    |
   |--------------------------------------------------------|
   | +++, A/                                                |
   |--------------------------------------------------------|
   | A, B, E, H, L, M, O, V, X, Z                           |
   |--------------------------------------------------------|
   | &D, &F, &G, &V, &W                                     |
   |--------------------------------------------------------|
   |                  Extended AT Commands                  |
   |--------------------------------------------------------|
   | \A, \B, \G, \L, \N, \Q, \T                             |
   |--------------------------------------------------------|
   | %E, %L, %Q                                             |
   |--------------------------------------------------------|
   |                  Special AT Commands                   |
   |--------------------------------------------------------|
   | *H, -K, -Q                                             |
   |--------------------------------------------------------|
   |                      S-Registers                       |
   |--------------------------------------------------------|
   | S0                                                     |
   |--------------------------------------------------------|
   |      Note: See MHI help file for complete information. |
   +--------------------------------------------------------+

   +------------------------------------------------------------+
   |                   UNIDENTIFIED COMMANDS                    |
   |------------------------------------------------------------|
   |          Command           |            Default            |
   |----------------------------+-------------------------------|
   |            S63             |         Unidentified          |
   +------------------------------------------------------------+

                     Proprietary AT Command Set

   +------------------------------------------------------------+
   |                         CALL TYPE                          |
   |------------------------------------------------------------|
   | Type:        | Register                                    |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] S61=n [cmds]                      |
   |--------------+---------------------------------------------|
   | Description: | Selects the type of call the TA will make.  |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |   i S61=0    | TA will dial according to dial modifiers.   |
   |--------------+---------------------------------------------|
   |    S61=2     | TA will place ISDN call.                    |
   |--------------+---------------------------------------------|
   |    S61=3     | TA will place modem call.                   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                            DIAL                            |
   |------------------------------------------------------------|
   | Type:        | Immediate                                   |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] D<#>;[cmds]                       |
   |--------------+---------------------------------------------|
   | Description: | Dials the telephone number indicated        |
   |              | according to any modifiers included in the  |
   |              | string.                                     |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |      D       | Dial number indicated with ISDN adapter.    |
   |--------------+---------------------------------------------|
   |      DP      | Dial number indicated in pulse dialing mode |
   |              | with modem.                                 |
   |--------------+---------------------------------------------|
   |      DT      | Dial number indicated in tone dialing mode  |
   |              | with modem.                                 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       PROTOCOL/SPEED                       |
   |------------------------------------------------------------|
   | Type:        | Configuration                               |
   |--------------+---------------------------------------------|
   | Format:      | AT [cmds] Fn [cmds]                         |
   |--------------+---------------------------------------------|
   | Description: | Selects the protocol and speed the modem    |
   |              | will attempt to connect at.                 |
   |--------------+---------------------------------------------|
   |   Command    |                  Function                   |
   |--------------+---------------------------------------------|
   |      F0      | Auto-detect the highest common connect      |
   |              | speed.                                      |
   |--------------+---------------------------------------------|
   |      F1      | Select V.21 or Bell 103 at 300bps speed.    |
   |--------------+---------------------------------------------|
   |      F3      | Select V.23 at 75/1200bps speed.            |
   |--------------+---------------------------------------------|
   |      F4      | Select V.22 or Bell 212A at 1200bps speed.  |
   |--------------+---------------------------------------------|
   |      F5      | Select V.22bis at 2400bps speed.            |
   |--------------+---------------------------------------------|
   |      F6      | Select V.32 or V.32bis at 4800bps speed.    |
   |--------------+---------------------------------------------|
   |      F7      | Select V.32bis at 7200bps speed.            |
   |--------------+---------------------------------------------|
   |      F8      | Select V.32bis or V.32 at 9600bps speed.    |
   |--------------+---------------------------------------------|
   |      F9      | Select V.32bis at 12Kbps speed.             |
   |--------------+---------------------------------------------|
   |     F10      | Select V.32bis at 14.4Kbps speed.           |
   +------------------------------------------------------------+

  See 3COM CORPORATION IMPACT (3C871) for a full command summary.