Cisco 1760 Hardware Installation Guide - Page 72
Symptom, Check the Following, Possible Solutions, Is the OK LED on?
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Page 72 highlights
Problem-Solving Chapter 3 Troubleshooting Table 3-4 Troubleshooting ISDN WIC ISDN S/T Symptom Router is on, but the OK LED on the card is off. Check the Following Is the OK LED on? Are all ISDN cables properly connected? Is the NT1 LED on? ISDN U Router is on, but the NT1 LED on the card is off. Is the OK LED on? Are all ISDN cables properly connected? Possible Solutions If no, the router/WIC 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/WIC might be malfunctioning. Contact your Cisco reseller. If yes, the ISDN line might be malfunctioning. Check with your ISDN service provider. 3-14 Cisco 1760 Modular Access Router Hardware Installation Guide 78-13342-03
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