3-13
Cisco 1760 Modular Access Router Hardware Installation Guide
78-13342-03
Chapter3 Troubleshooting
Problem-Solving
Troubleshooting ISDN
Because ISDN uses many variables and supports many different configurations, it
can sometimes cause problems for the router.
Two commands are useful when troubleshooting ISDN:
•For routers with an ISDNS/T WIC, enter the clear inter face 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 bri0/0
Router# clear interface bri1/0
•For routers with an ISDN U WIC, use the clear controller command to
terminate any active ISDN calls, to reset the ISDNBRI 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 3 -4 lists troubleshooting methods for ISDN-specific problems that might
occur.
The router is on, but the PWRLED is
off.
The PWR LED is broken. Return the router to your Cisco
reseller.
The PWR LED is on, the OK LED is
off, and the router does not pass
console or EIA data.
The router may be malfunctioning. Contact your Cisco reseller.
Table3-3 Troubleshooting the Power System (continued)
Symptom Possible Solutions