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HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
TROUBLESHOOTING PROCEDURES
Table 18
is a troubleshooting guide for the DDM+ HTU-C.
Condition
Front Panel
Indicator
STATUS
is off.
MAINTENANCE
The HDSL DDM+ Transceiver Unit for Central Office does not require routine maintenance for
normal operation. Do not attempt to repair the DDM+ HTU-C in the field. Repair services are
obtained by returning the defective unit to ADTRAN. Refer to
further information.
38
Table 18. Troubleshooting Guide
1. Verify that –48 VDC power is properly connected to the shelf.
2. Inspect the fuse and verify that it is not blown.
3. Insert the DDM+ HTU-C into a slot known to be in good working
condition; check to see if
4. If steps
1
and
2
Solution
indicator is on.
STATUS
pass, but step
3
fails, replace the DDM+ HTU-C.
"Appendix C, Warranty"
for
61247003L6-5A
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Table of Contents
Troubleshooting
