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

[Image]

                                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 on       CN11
                                     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)

[Image]

                             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