Troubleshooting 7-5
When the D channel LED goes out, it indicates that a valid communication channel has been established and you can make calls.
■If the D channel LED remains lit for more than a few minutes, it is likely that there is a poor physical connection to the local telephone company.
This fault can be caused by a cable connected to one of the analog device ports instead of the ISDN jack, a dam- aged cable, a broken wire, a damaged connector, a non- standard U interface (proprietary AMI line coding), or a problem within the telephone company network. If the tele- phone wires at your site appear to be satisfactory, call your local telephone company for repair of telephone company equipment and troubleshooting assistance.
■If the D channel LED flashes for more than a few minutes without going out, there is probably a mismatch between the settings of the ISDN line and the Netopia ISDN Modem configuration.
Check the switch type, Service Profile Identifier (SPID) entry, and the phone number in the ISDN modem software configuration utility.
If your switch type, SPID, and phone number are entered properly and the D channel LED continues to flash without going out, call your telephone company, verify that you have been given the correct SPID and phone number, and ask whether the ISDN line is
Also verify that the telephone company has configured the ISDN line properly for the Netopia ISDN Modem. (For infor- mation, see the “General ISDN line configuration” section on page
