ADTRAN HDSL2 - Manual (Page 63)

HDSL2 for General Distribution Installation and Maintenance Practice Troubleshooting
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TROUBLESHOOTING
Table 13 provides a H2TU-C troubleshooting guide to assist in problem resolution.
Table 13. H2TU-C Troubleshooting Guidelines
Condition Solution
All front panel indicators are
off. 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 H2TU-C into a slot known to be in good working condi-
tion, and check the LED indicators.
4. If steps 1 and 2 pass, but step 3 fails, replace the H2TU-C.
DSL
LED is solid Red. Loop has poor signal quality or loss of sync. Basic troubleshooting
procedures should identify a problem with the cable pair.
DSX/DS1
LED is solid Red. Errors are being taken on the DSX-1, DS1 or HDSL2 loop. The craft
interface will identify the source. BERT tests toward the appropriate
loopbacks should also reveal the source of the problem.
ALM
LED is solid Red. Loss of DSX-1 signal to the unit.
ALM
LED is Yellow. If customer equipment is not installed, initiate an H2TU-R to Network
Loopback and perform a BERT test. If this test fails, or the craft inter-
face indicates a loss of sync, then there is a potential problem with
the cable pair that should be identified through basic troubleshooting
procedures.