Table 13. H2Tu-C Troubleshooting Guidelines; Troubleshooting - ADTRAN HDSL2 Installation And Maintenance Practice

HDSL2 for General Distribution Installation and Maintenance Practice

TROUBLESHOOTING

Table 13 provides a H2TU-C troubleshooting guide to assist in problem resolution.
Condition
All front panel indicators are
off.
LED is solid Red.
DSL
LED is solid Red.
DSX/DS1
LED is solid Red.
ALM
LED is Yellow.
ALM
61223HDSL2L2-5B

Table 13. H2TU-C Troubleshooting Guidelines

Solution
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
Loop has poor signal quality or loss of sync. Basic troubleshooting
procedures should identify a problem with the cable pair.
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.
Loss of DSX-1 signal to the unit.
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.
2 pass, but step 3 fails, replace the H2TU-C.
Troubleshooting
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