8-4 CHAPTER 8: TROUBLESHOOTING

communicate at incompatible baud rates. Refer to “Evaluating Symptoms and Solutions” below.

Monitoring the DTR LED

When illuminated, the Data Terminal Ready LED indicates that communication between the 3C882 ISDN modem and your computer has been established.

If the DTR LED does not illuminate, refer to “Evaluating

Symptoms and Solutions” below.

Evaluating Symptoms and Solutions

Table 8-1lists symptoms of common problems, possible causes, and possible solutions.

Table 8-1 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.

(Continued)

Verify the telephone number and SPID (if required). If the D channel LED continues to flash, open the 3C882 ISDN modem’s Configuration dialog box. If your telephone number has changed, the SPID Wizard may be able to reconfigure your SPID values. Or 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, “Ordering ISDN Service.”).