3com 4000 Manual De Usuario

A

PPENDIX

 C: I

NSTALLING

 I/O C

ARDS

To cable a synchronous card:

1 Connect the DB-50 end of the cable to the synchronous port on the 

I/O card, then attach the other end to the CSU/DSU or modem 
connector, as shown in Figure C-7.

Figure C-7   Connecting a Cable to a Synchronous I/O Card

To connect either the U card to the ISDN line, or the S/T card to the 
NT1, (which in turn connects to the ISDN line), use the RJ-45 to RJ-45 
cables 3Com supplies with the each card.

X.21 cable

The network connector is a male 15-pin X.21 connector for 
access to modem or data service unit (CSU/DSU) interfaces.

Table C-1   Types of Synchronous Cables

ab4kbook  Page 8  Thursday, March 27, 1997  11:51 AM