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Chapter 3. Troubleshooting
MAINTENANCE
The ADTRAN NT1 Type 400 requires no routine maintenance to op-
erate. In case of equipment malfunction, refer to the sections, Remote
Testing and Repair and Return below, and/or remove the unit and re-
place it with another unit optioned in an identical manner.
REMOTE TESTING
Network test features include a loopback test initiated at the central
office. This test confirms network integrity to the NT1 Type 400.
REPAIR AND RETURN
Repairs should not be performed in the field. Repair services can be
obtained by returning the unit to the ADTRAN Customer and Product
Service (CAPS) Department at the address listed on the back page of
this manual.
3-2
NT1 T400 User Manual
61212016L1-20
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