Table 14. H2Tu-R Troubleshooting Guidelines - ADTRAN HDSL2 Installation And Maintenance Practice

Troubleshooting
Table 14 provides an H2TU-R troubleshooting guide to assist in problem resolution.
Condition
All front panel indicators are
off.
Power is present and ade-
quate, but loop sync is not
available ( LED is off).
DSL
54

Table 14. H2TU-R Troubleshooting Guidelines

Solution
1. Make sure the H2TU-R is properly seated in the housing.
2. Check powering voltage:
• For Span Powered unit (1223026L2) verify that the H2TU-C is
delivering sufficient simplex voltage to the loop.
• For Local Powered unit (1223024L2) verify that –48 VDC is
properly connected.
3. If steps 1 and
1. Verify that the loop conforms with CSA guidelines (not too long,
etc.). For more information, refer to
lines".
2. Verify that loop loss at 196 kHz is not greater than 35 dB.
3. Verify that noise on the HDSL2 loop is within acceptable limits.
4. If steps 1 through
replace unit.
HDSL2 for General Distribution Installation and Maintenance Practice
2 pass, replace the H2TU-R.
3 pass and loop sync is still not available,
"HDSL2 Deployment Guide-
61223HDSL2L2-5B