Cisco Systems CISCO1750 manual Troubleshooting ISDN, Troubleshooting the Power System

		Problem Solving
Table 3	Troubleshooting the Power System
Symptom		Possible Solution(s)
The router is on, but the front-panel		The power supply has failed. Return the router to your
PWR LED is off.		Cisco reseller.
The front-panel PWR LED is on, the		The power supply has failed. Return the router to your
front-panel OK LED is off, and the		Cisco reseller.
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:

•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

Table 4 lists troubleshooting methods for ISDN-specific problems that might occur.

Cisco 1750 Router Hardware Installation Guide

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