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Chapter 3
If you encounter problems during installation, the following list
shows possible symptoms and solutions. If these solutions fail to cor-
rect the problem, contact ADTRAN Technical Support at 888
4ADTRAN.
Problem
POWER indicator is not
illuminated.
ERROR indicators illuminated;
READY indicators flash at a
faster 8 Hz rate.
ERROR indicators illuminated;
READY indicators flash at a
slower 1Hz rate.
READY indicators do not
illuminate.
Unable to make or receive a call.
61212016L1-20
Troubleshooting
NT1 T400 User Manual
Possible Solution
•
NT1 Type 400 needs replacement.
•
Insufficient power to the NT1 Type
400
Network activation failure:
•
Wall jack wiring is incorrect: Check
wall jack.
•
Problem with ISDN line: Contact
telephone company
Local bus failure:
•
TE not connected: Connect TE.
•
TE not receiving power from NT1:
Consult TE documentation.
•
TE not terminated properly: Correct
termination.
•
TE ISDN parameters not configured
properly: Reconfigure TE (SPIDs,
LDNs, switch type, etc.).
•
Problem with ISDN network: Con-
tact telephone company.
•
ISDN line not plugged into U jack:
Plug ISDN line into U jack.
•
TE is not compatible with ISDN net-
work: Contact telephone company.
•
TE ISDN parameters not configured
properly: Reconfigure TE (SPIDs,
LDNs, switch type, etc.).
3-1
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