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Cisco 1600 Series Router Hardware Installation Guide

Troubleshooting ISDN

A-8

Figure A-1 lists troubleshooting methods for ISDN-speciﬁc problems that might occur.

Figure A-1 Troubleshooting ISDN

Symptom Checks Causes and Solutions

Router is on:

OK LED (next to ISDN S/T port) is off

(Cisco 1603 and ISDN S/T WAN interface card).

• Is the SYSTEM OK LED

on?

• Are all ISDN cables

properly connected?

• Is the NT1 LED on?

• Possible router hardware

problem.

• Possible ISDN line

problem. Check with ISDN

service provider.

• Possible NT1 problem.

Router is on:

NT1 LED is off

(Cisco 1604 and ISDN U WAN interface card).

• Is the SYSTEM OK LED

on?

• Are all ISDN cables

properly connected?

• Is the ISDN line connected

to the router ISDN U port?

• Possible router hardware

problem.

• Possible ISDN line

problem. Check with ISDN

service provider.

• Possible ISDN line

problem. Check with ISDN

service provider.

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Cisco 1600R Guide d'installation Page 56