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       # XIRCOM, INC.
       
          MCI-23
       
          Card Type          ISDN DSU                                    
          Chip Set           Unidentified                                
          I/O options        Unidentified                                
          ISDN Transfer Rate 64Kbps x 23                                 
          Data Bus           16-bit ISA                                  
          Switch Type        5ESS, DMS-100, MD-110                       
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          |    Function     | Label |       Function        |  Label   |
          |-----------------+-------+-----------------------+----------|
          | Line B out      |  CN1  | Used only on CSU/DSU  | CN4-CN7  |
          |                 |       | model                 |          |
          |-----------------+-------+-----------------------+----------|
          | Line A out      |  CN2  | Daughterboard headers | CN8-CN10 |
          |-----------------+-------+-----------------------+----------|
          | Diagnostic port |  CN3  | MVIP bus - not used   |   CN11   |
          |                 |       | on this model         |          |
          +------------------------------------------------------------+
       
       +--------------------------------------------------------------------+
       |                          BASE I/O ADDRESS                          |
       |--------------------------------------------------------------------|
       |Setting|SW1/1|SW1/2|SW1/3|SW1/4|SW1/5|SW1/6|SW1/7|SW1/8|SW1/9|SW1/10|
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 0000h | On  | On  | On  | On  | On  | On  | On  | On  | On  |  On  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 0010h | On  | On  | On  | On  | On  | On  | On  | On  | On  | Off  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 0020h | On  | On  | On  | On  | On  | On  | On  | On  | Off |  On  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 0030h | On  | On  | On  | On  | On  | On  | On  | On  | Off | Off  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 0040h | On  | On  | On  | On  | On  | On  | On  | Off | On  |  On  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 01E0h | On  | On  | On  | On  | On  | Off | Off | Off | Off |  On  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 3FB0h | Off | Off | Off | Off | Off | Off | Off | On  | Off | Off  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 3FC0h | Off | Off | Off | Off | Off | Off | Off | Off | On  |  On  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 3FD0h | Off | Off | Off | Off | Off | Off | Off | Off | On  | Off  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 3FE0h | Off | Off | Off | Off | Off | Off | Off | Off | Off |  On  |
       |-------+-----+-----+-----+-----+-----+-----+-----+-----+-----+------|
       | 3FF0h | Off | Off | Off | Off | Off | Off | Off | Off | Off | Off  |
       |--------------------------------------------------------------------|
       |     Note: A total of 1023 base address settings are available. The |
       |     switches are a binary representation of the decimal memory     |
       |     addresses. SW1/1 is the Most Significant Bit and switch SW1/10 |
       |     is the Least Significant Bit. The switches have the following  |
       |     decimal values: SW1/1=8192, SW1/2=4096, SW1/3=2048, SW1/4=1024,|
       |     SW1/5=512, SW1/6=256, SW1/7=128, SW1/8=64, SW1/9=32, SW1/10=16.|
       |     Turn off the switches and add the values of the switches that  |
       |     are off to obtain the correct memory address. (Off=1, On=0)    |
       +--------------------------------------------------------------------+
       
 (IMG) IMG 2
          
       
          +------------------------------------------------------------+
          |                     DIAGNOSTIC LED(S)                      |
          |------------------------------------------------------------|
          | LED  | Color  | Status |             Condition             |
          |------+--------+--------+-----------------------------------|
          | LED1 | Yellow |   On   |  Carrier signal not detected on   |
          |      |        |        |              port A               |
          |------+--------+--------+-----------------------------------|
          | LED1 | Yellow |  Off   | Carrier signal detected on port A |
          |------+--------+--------+-----------------------------------|
          | LED2 | Yellow |   On   |  Carrier signal not detected on   |
          |      |        |        |              port B               |
          |------+--------+--------+-----------------------------------|
          | LED2 | Yellow |  Off   | Carrier signal detected on port B |
          |------+--------+--------+-----------------------------------|
          | LED3 | Green  |   On   |          Board is active          |
          |------+--------+--------+-----------------------------------|
          | LED3 | Green  |  Off   |        Board is not active        |
          |------+--------+--------+-----------------------------------|
          | LED4 | Yellow |   On   |         Board has failed          |
          |------+--------+--------+-----------------------------------|
          | LED4 | Yellow |  Off   |    Board is operating normally    |
          +------------------------------------------------------------+