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Cisco 1700 Router Hardware Installation Guide
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Chapter 3 Troubleshooting
Table 3-4 Troubleshooting ISDN
WAN Interface
Card Symptom(s) Check the Following Possible Causes
ISDN S/T Router is on, but
OK LED on card
is off.
• Is the OK LED on the
router front panel on?
• If no, the router might be
malfunctioning. Contact your Cisco
reseller.
• Are all ISDN cables
properly connected?
• If yes, the ISDN line might be
malfunctioning. Check with your ISDN
service provider.
• Is the NT1 on? • If no, the NT1 might be malfunctioning.
ISDN U Router is on, but
the NT1 LED on
card is off.
• Is the OK LED on? • If no, the router might be
malfunctioning. Contact your Cisco
reseller.
• Are all ISDN cables
properly connected?
• If yes, the ISDN line might be
malfunctioning. Check with your ISDN
service provider.
• Is the ISDN line connected
to the card ISDN U port?
• If yes, the ISDN line might be
malfunctioning. Check with your ISDN
service provider.