Telephone User Manual

Installation Procedures Installation
2-14 DBS-EX23-530 Revised April 2000
a. Remove the jumper from CN4 on the Sync Card (Figure 2-3 on page 2-
15).
b. Put the CSU in the local loopback mode.
c. Check the CFA LED on the ISDN card. If the LED is dark, the cabling
between the CSU and DBS is okay. If the LED is lit, go to the next step.
d. Check the cabling from the DBS to the CSU.
e. If you don’t find cabling errors, take the CSU out of local loopback
mode and reinstall the jumper on CN4 of the Sync Card.
f. If the CFA LED remains lit, check the cabling from the CSU to the
network demarcation point.
Installing an ISDN in a Single Cabinet
The following instructions explain how to install a ISDN in a single-cabinet
system. These instructions also apply when a ISDN is installed in only the
master cabinet of a two cabinet system.
If only one ISDN is installed in a two-cabinet system, it must be installed in
the cabinet specified in Table 2-1 on page 2-3.
Note: For systems consisting of a DBS 72 connected to a DBS 40, the ISDN
Interface cannot be used.
1. Before beginning ISDN installation, perform the “ISDN Function Reset”
command (
FF1 9# 1# 1#
).
This command must be issued before the ISDN
can be installed properly.
2. Check SW4 on the SCC-B card. Be sure it is set to “Mode B.”
Sync Source 4-4 to 4-6
Trunk Configuration 4-16
ISDN Trunk Type 4-28