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Table 3
Troubleshooting the Power System
Symptom
The router is on, but the front-panel
PWR LED is off.
The front-panel PWR LED is on, the
front-panel OK LED is off, and the
router does not pass console or EIA
data.
Troubleshooting ISDN
Because ISDN uses many variables and supports many different configurations, it
sometimes can cause problems for the router. This section describes problems
related to the ISDN line that might occur.
Two commands are useful when troubleshooting ISDN:
Table 4 lists troubleshooting methods for ISDN-specific problems that might
occur.
78-6169-02
Possible Solution(s)
The power supply has failed. Return the router to your
Cisco reseller.
The power supply has failed. Return the router to your
Cisco reseller.
For routers with an ISDN S/T WIC, enter the clear interface command to
•
terminate any active ISDN calls and to reset the ISDN BRI interface. Do this
for each ISDN port installed in the router:
Router# clear interface bri0
Router# clear interface bri1
For routers with an ISDN U WIC, use the clear controller command to
•
terminate any active ISDN calls, to reset the ISDN BRI interface, and to reset
the ISDN line between the router and the central office switch. Do this for
each ISDN port installed in the router:
Router# clear controller bri0
Router# clear controller bri1
Cisco 1750 Router Hardware Installation Guide
Problem Solving
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Table of Contents
Troubleshooting
