Cisco Systems CISCO1750 Symptom, Check the Following, Possible Solutions, Troubleshooting ISDN

Problem Solving

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

Cisco 1750 Router Hardware Installation Guide

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