Farallon Communications 412, 612

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 Point-to-Point. If the ISDN line

is Point-to-Point, be sure to NOT include the SPID in the

conﬁguration.

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 2-14.) If the D channel LED does not go out after

these veriﬁcations, call Farallon technical support for line

conﬁguration and troubleshooting assistance.