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

   SPORTSTER 56K VOICE FAXMODEM (EXTERNAL)

   Card Type              Modem (asynchronous)                    
   Chipset                U.S. Robotics                           
   I/O Options            Voice, speakerphone, speaker out        
   Maximum Data Rate      56Kbps                                  
   Maximum Fax Rate       14.4Kbps                                
   Data Modulation        Bell 103A/212A                          
                                                                  
                          ITU-T V.21, V.22, V.22bis, V.23, V.32,  
                          V.32bis, V.34                           
                                                                  
                          U.S. Robotics x2                        
   Fax Modulation         ITU-T V.17, V.21CH2, V.27ter, V.29      
   Error                  MNP5, V.42, V.42bis                     
   Correction/Compression 
   Fax Class              Class I & II                            
   Data Bus               Serial                                  

<gopher://bitreich.org/I/th99/t/0-9/54174-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |        Function        | Label |     Function      | Label |
   |------------------------+-------+-------------------+-------|
   | AC power in            |  CN1  | Serial port       |  CN5  |
   |------------------------+-------+-------------------+-------|
   | Telephone line in      |  CN2  | Power switch      |  SW1  |
   |------------------------+-------+-------------------+-------|
   | Telephone line out     |  CN3  | Volume            |  VR1  |
   |------------------------+-------+-------------------+-------|
   | Speaker out            |  CN4  |                   |       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DIAGNOSTIC LED(S)                      |
   |------------------------------------------------------------|
   | LED |    Color     |  Status  |         Condition          |
   |-----+--------------+----------+----------------------------|
   | AA  | Unidentified |    On    |    Auto-answer enabled     |
   |-----+--------------+----------+----------------------------|
   | AA  | Unidentified |   Off    |    Auto-answer disabled    |
   |-----+--------------+----------+----------------------------|
   | AA  | Unidentified | Blinking |      Phone is ringing      |
   |-----+--------------+----------+----------------------------|
   | CD  | Unidentified |    On    |  Carrier signal detected   |
   |-----+--------------+----------+----------------------------|
   | CD  | Unidentified |   Off    |     Carrier signal not     |
   |     |              |          |          detected          |
   |-----+--------------+----------+----------------------------|
   | CD  | Unidentified | Blinking |    Modem is retraining     |
   |-----+--------------+----------+----------------------------|
   | SD  | Unidentified |    On    | Modem is transmitting data |
   |-----+--------------+----------+----------------------------|
   | SD  | Unidentified |   Off    | Modem is not transmitting  |
   |     |              |          |            data            |
   |-----+--------------+----------+----------------------------|
   | RD  | Unidentified |    On    |  Modem is receiving data   |
   |-----+--------------+----------+----------------------------|
   | RD  | Unidentified |   Off    |   Modem is not receiving   |
   |     |              |          |            data            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DIAGNOSTIC LED(S) (CON'T)                  |
   |------------------------------------------------------------|
   |   LED   |    Color     |  Status  |       Condition        |
   |---------+--------------+----------+------------------------|
   |   TR    | Unidentified |    On    |   DTR signal is high   |
   |---------+--------------+----------+------------------------|
   |   TR    | Unidentified |   Off    |   DTR signal is low    |
   |---------+--------------+----------+------------------------|
   |   CS    | Unidentified |    On    |   CTS signal is high   |
   |---------+--------------+----------+------------------------|
   |   CS    | Unidentified |   Off    |   CTS signal is low    |
   |---------+--------------+----------+------------------------|
   | ARQ/FAX | Unidentified |    On    | Modem is connected in  |
   |         |              |          | error correction mode  |
   |---------+--------------+----------+------------------------|
   | ARQ/FAX | Unidentified |   Off    | Modem is not connected |
   |         |              |          |  in error correction   |
   |         |              |          |          mode          |
   |---------+--------------+----------+------------------------|
   | ARQ/FAX | Unidentified | Blinking | Modem is connected in  |
   |         |              |          |  FAX mode or modem is  |
   |         |              |          |  retransmitting data   |
   |         |              |          |     due to errors      |
   |------------------------------------------------------------|
   |      Note: The locations of the LEDs are unidentified.     |
   +------------------------------------------------------------+

   +----------------------------------------------+
   |        MISCELLANEOUS TECHNICAL NOTES         |
   |----------------------------------------------|
   |      A front panel diagram is not available. |
   +----------------------------------------------+

   +------------------------------------------------------------+
   |                SUPPORTED STANDARD COMMANDS                 |
   |------------------------------------------------------------|
   |                     Basic AT Commands                      |
   |------------------------------------------------------------|
   | +++, 'comma', A/                                           |
   |------------------------------------------------------------|
   | A, B, D, E, F, H, L, M, O, P, T, V, X, Z                   |
   |------------------------------------------------------------|
   | &C, &D, &F, &G, &P, &R, &S, &T, &W                         |
   |------------------------------------------------------------|
   |                        S-Registers                         |
   |------------------------------------------------------------|
   | S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12,     |
   | S18, S25, S38                                              |
   |------------------------------------------------------------|
   |      Note: See MHI help file for complete information.     |
   +------------------------------------------------------------+

                     Proprietary AT Command Set

   See U.S. ROBOTICS SPORTSTER 56K FAXMODEM (INTERNAL) for a full
                          command summary.