Chapter 3. Troubleshooting and Maintenance
36 T1 CSU ACE User Manual 61202022L1-1B
Equipment LOS
Condition: EQ LOS LED is illuminated.
1. Verify that the cable from the CPE is in the CPE modular jack on
the bottom/end of the CSU ACE.
2. If all connections seem intact, use a BERT test set in the NET IN
and NET OUT jacks to test the CPE.
Power On - Self Check Failure
Condition: NET LOS, EQ LOS, NET LB, and EQ LB all flash in uni-
son, continuously.
• The unit has failed its internal self check. Return the unit to the
ADTRAN Customer and Product Service (CAPS) Department as
instructed on page 12.
EPROM Checksum Failure
Condition: NET LOS and EQ LOS Flash alternately with NET LB
and EQ LB for the first 10 seconds after power up.
• The unit’s EPROM has a bad checksum. Return the unit to the
ADT RAN CAP s De par tm ent as i nst ruc ted in t he P ro duc t Su ppo rt
page on the back page of this manual.
MAINTENANCE
The T1 CSU ACE requires no routine maintenance. No repairs should
be performed by the customer. Repair services can be obtained by re-
turning the unit to the ADTRAN Customer and Product Service
(CAPS) department as instructed on page 12.