Cisco 1751V Hardware Installation Manual page 55

Chapter 3 Troubleshooting
Table 3-4 Troubleshooting ISDN
WIC Symptom
ISDN S/T Router is on,
but the OK
LED on the
card is off.
ISDN U Router is on,
but the NT1
LED on the
card is off.
78-11258-04
Check the Following
Is the OK LED on the
router front panel on?
Are all ISDN cables
properly connected?
Is the NT1 LED on?
Is the OK LED on?
Are all ISDN cables
properly connected?
Is the ISDN line
connected to the card
ISDN U port?
Cisco 1751 Router Hardware Installation Guide
Possible Solution(s)
If no, the router might be
malfunctioning. Contact your Cisco
reseller.
If yes, the ISDN line might be
malfunctioning. Check with your
ISDN service provider.
If no, the NT1 might be
malfunctioning.
If no, the router might be
malfunctioning. Contact your Cisco
reseller.
If yes, the ISDN line might be
malfunctioning. Check with your
ISDN service provider.
If yes, the ISDN line might be
malfunctioning. Check with your
ISDN service provider.
Problem Solving
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