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C-8
A
C: I
PPENDIX
NSTALLING
ISDN Card
I/O C
ARDS
Table C-1 Types of Synchronous Cables
Cable Type
X.21 cable
If you have mistakenly received the wrong synchronous cable with your
I/O card, contact your supplier for a replacement.
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.
Description
The network connector is a male 15-pin X.21 connector for
access to modem or data service unit (CSU/DSU) interfaces.
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