ADTRAN 1212010, User Manual

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61212016L1-20 NT1 T400 User Manual 3-1
Chapter 3
Troubleshooting
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 Possible Solution
POWER indicator is not
illuminated. • NT1 Type 400 needs replacement.
• Insufficient power to the NT1 Type
400
ERROR indicators illuminated;
READY indicators flash at a
faster 8 Hz rate.
Network activation failure:
•
Wall jack wiring is incorrect: Check
wall jack.
• Problem with ISDN line: Contact
telephone company
ERROR indicators illuminated;
READY indicators flash at a
slower 1Hz rate.
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.).
READY indicators do not
illuminate. • Problem with ISDN network: Con-
tact telephone company.
• ISDN line not plugged into U jack:
Plug ISDN line into U jack.
Unable to make or receive a call. • TE is not compatible with ISDN net-
work: Contact telephone company.
• TE ISDN parameters not configured
properly: Reconfigure TE (SPIDs,
LDNs, switch type, etc.).