Troubleshooting Isdn - Cisco 1721 - VPN Security Router Bundle Hardware Installation Manual
Hardware installation guide
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Also See for 1721 - VPN Security Router Bundle:
- Hardware troubleshooting (12 pages) ,
- Hardware installation manual (11 pages) ,
- User manual (48 pages)
Table of Contents
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Chapter 3
Troubleshooting
Table 3-3
Troubleshooting the Power System
Symptom
Router shuts down after being on a
short time.
The router attempts to boot, but all
LEDs remain off.
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
78-13834-02
Possible Cause(s)
•
Make sure that the area in which the router is installed
meets the environmental site requirements in
"Technical Specifications,"
If the front panel PWR LED is not on, the power supply has
•
failed.
The power supply has failed.
The power supply has failed.
The power supply has failed.
Because ISDN uses many variables and supports many different configurations, it
sometimes can cause problems for the router. This section describes possible
problems related to the ISDN line.
Two commands are useful for 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
in this guide.
Cisco 1721 Router Hardware Installation Guide
Problem Solving
Appendix A,
3-11
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Table of Contents
Troubleshooting
