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       # XIRCOM, INC.
       
          CEM-33BC
       
          Card Type              Modem (asynchronous), Ethernet          
          Chipset                Unidentified                            
          Maximum Onboard Memory 64KB SRAM/256KB Flash RAM               
          Boot ROM               Not available                           
          Network Transfer Rate  10Mbps                                  
          Topology               Linear Bus/Star                         
          Wire Type              RG-58A/U 50ohm coaxial                  
                                                                         
                                 Unshielded twisted pair                 
          Maximum Data Rate      33.6Kbps                                
          Maximum Fax Rate       14.4Kbps                                
          Data Modulation        Bell 212A                               
                                                                         
                                 ITU-T V.22, V.22bis, V.23, V.32,        
                                 V.32bis, V.34                           
                                                                         
                                 AT&T V.32terbo                          
          Fax Modulation         ITU-T V.17, V.27ter, V.29               
          Error                  MNP5, V.42, V.42bis                     
          Correction/Compression 
          Fax Class              Class I & II                            
          Data Bus               PCMCIA Type II                          
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |       Function        | Label |      Function      | Label |
          |-----------------------+-------+--------------------+-------|
          | MAM connector to      |  CN1  | RG-58A/U 50ohm     |  CN4  |
          | PCMCIA card           |       | coaxial connector  |       |
          |-----------------------+-------+--------------------+-------|
          | Telephone line out    |  CN2  | MAM connector to   |  CN5  |
          |                       |       | PCMCIA card        |       |
          |-----------------------+-------+--------------------+-------|
          | MAM connector to      |  CN3  | UTP connector      |  CN6  |
          | PCMCIA card           |       |                    |       |
          |------------------------------------------------------------|
          |      Note: Either the MAM with CN4 or with CN6 may be used |
          |      at one time.                                          |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          | LED  |    Color     | Status |          Condition          |
          |------+--------------+--------+-----------------------------|
          | LED1 | Unidentified |   On   |   Card is transmitting or   |
          |      |              |        |   receiving data over the   |
          |      |              |        |            modem            |
          |------+--------------+--------+-----------------------------|
          | LED1 | Unidentified |  Off   | Card is not transmitting or |
          |      |              |        |   receiving data over the   |
          |      |              |        |            modem            |
          |------+--------------+--------+-----------------------------|
          | LED2 | Unidentified |   On   |   Carrier signal detected   |
          |------+--------------+--------+-----------------------------|
          | LED2 | Unidentified |  Off   | Carrier signal not detected |
          |------+--------------+--------+-----------------------------|
          | LED3 | Unidentified |   On   |   Card is transmitting or   |
          |      |              |        |     receiving data over     |
          |      |              |        |          Ethernet           |
          |------+--------------+--------+-----------------------------|
          | LED3 | Unidentified |  Off   | Card is not transmitting or |
          |      |              |        |     receiving data over     |
          |      |              |        |          Ethernet           |
          |------+--------------+--------+-----------------------------|
          | LED4 | Unidentified |   On   |         Power is on         |
          |------+--------------+--------+-----------------------------|
          | LED4 | Unidentified |  Off   |        Power is off         |
          |------+--------------+--------+-----------------------------|
          | LED5 | Unidentified |   On   |   Card is transmitting or   |
          |      |              |        |     receiving data over     |
          |      |              |        |          Ethernet           |
          |------+--------------+--------+-----------------------------|
          | LED5 | Unidentified |  Off   | Card is not transmitting or |
          |      |              |        |     receiving data over     |
          |      |              |        |          Ethernet           |
          |------+--------------+--------+-----------------------------|
          | LED6 | Unidentified |   On   | Network connection is good  |
          |------+--------------+--------+-----------------------------|
          | LED6 | Unidentified |  Off   |    Network connection is    |
          |      |              |        |           broken            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                SUPPORTED STANDARD COMMANDS                 |
          |------------------------------------------------------------|
          |                     Basic AT Commands                      |
          |------------------------------------------------------------|
          | +++, A/                                                    |
          |------------------------------------------------------------|
          | A, D, E, H, M, N, P, Q, T, V, W, X, Y, Z                   |
          |------------------------------------------------------------|
          | &C, &D, &F, &G, &K, &P, &S, &V, &W, &Y, &Z                 |
          |------------------------------------------------------------|
          |                    Extended AT Commands                    |
          |------------------------------------------------------------|
          | \A, \B, \C, \G, \K, \N, \Q, \T, \U, \V, \X, \Y, \Z         |
          |------------------------------------------------------------|
          | %A, %C, %E, %G                                             |
          |------------------------------------------------------------|
          |                    Special AT Commands                     |
          |------------------------------------------------------------|
          | -C, "H, -J, "O                                             |
          |------------------------------------------------------------|
          |                        S-Registers                         |
          |------------------------------------------------------------|
          | S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S25,     |
          | S30, S46, S82, S95, S108                                   |
          |------------------------------------------------------------|
          |      Note: See MHI help file for complete information.     |
          +------------------------------------------------------------+
       
                            Proprietary AT Command Set
       
         See document XIRCOM, INC. CEM-33BTMD for a full command summary.