3Com 3C882 manual Evaluating Symptoms and Solutions, Monitoring the B Channel LEDs

Evaluating Symptoms and Solutions 7-3

Monitoring the B Channel LEDs

Attempt to place a call and observe the B channel LED(s). The B1 and B2 LEDs flash amber for a voice call or green for a data call during the call establishment phase. They then remain continuously amber or green once the connection is established. If they do not remain continuously amber or green, refer to the “Evaluating Symptoms and Solutions” section.

Evaluating Symptoms and Solutions

Table 7-1 lists symptoms of common problems, possible causes, and possible solutions.

Table 7-1 Symptoms, Causes, and Solutions

Symptom	Possible Cause	Solution
TEST LED remains	An internal failure.	Notify 3Com Technical Support that
lit for more than a		the 3C882 ISDN modem has failed the
few minutes		self-test.
D channel remains	Poor physical connection to	If the telephone wires at your site
lit for more than a	the local telephone company.	appear to be satisfactory, call your
few minutes		local telephone company for repair of
		telephone company equipment and
		troubleshooting assistance.

D channel	A mismatch between the
continues to flash	settings of the ISDN line and
for more than a	the 3C882 ISDN modem
few minutes	configuration.

Verify the telephone number and SPID (if required). If the D channel LED continues to flash, call your telephone company to verify the SPID and telephone number and ensure that the telephone company has configured the ISDN line properly (refer to Appendix A).

Calls cannot be	If you cannot place a calls,
placed from	there may be a problem with
analog equipment	the configuration of your
	ISDN line.
	Calls from that analog port
	may be blocked.

Call the telephone company and have it verify that your line is configured for circuit-switched voice and data service.

From the Configuration dialog box, check the Phone Port 1 and Phone Port 2 boxes which are used for voice call routing. Ensure that the correct Phone Port box for that port is checked.

(continued)