Troubleshooting Procedures; Maintenance - ADTRAN T200 H2TU-R Installation And Maintenance Manual

8. TROUBLESHOOTING PROCEDURES

Use Table 6 to troubleshoot the ADTRAN H2TU-R.
Condition: All front panel indicators are Off.
Solutions:
1. Make sure the H2TU-R is properly seated in the housing.
2. Verify that the H2TU-C is delivering sufficient simplex voltage to the loops.
3. If Steps 1 and 2 pass, replace the H2TU-R.
Condition: Power is present and adequate, but loop sync is not available (HLOS).
Solutions:
1. Verify that the loop conforms with CSA guidelines (not too long, etc.).
2. Verify that the tip and ring of the HDSL2 loop belong to the same twisted pair.
3. Verify that loop loss at 196 kHz is not greater than 35 dB.
4. Verify that noise on the HDSL2 loop is within acceptable limits (see section 7 of this practice).
5. If steps 1 through 4 pass and loop sync is still not available, replace the H2TU-R.
Condition: HCRC LED is blinking yellow.
Solution:
Errors are being taken on the HDSL2 loop. The craft interface will identify the source. BERT tests to the
appropriate loopbacks should also reveal the source of the problem.
Condition: DSL LED is yellow, red or blinking.
Solutions:
1. Verify that loss (pulse attenuation) on Current System Status screen is < 30 dB.
2. Verify that the loop conforms with CSA guidelines (not too long, etc.).
3. Verify that loop loss at 196 kHz is not greater than 35 dB.
4. Verify that noise on the HDSL2 loop is within acceptable limits (see section 7 of this practice).
5. If steps 1 through 4 pass and LED is yellow, good service can be assumed.
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9. MAINTENANCE

The ADTRAN H2TU-R requires no routine
maintenance. In case of equipment malfunction, use
the faceplate Bantam jack and/or DB-9 connector to
help locate the source of the problem.
ADTRAN does not recommend that repairs be
performed in the field. Repair services may be
obtained by returning the defective unit to the
ADTRAN Customer and Product Service (CAPS)
Department.
Table 6. Troubleshooting Guide
Section 61222026L7-5, Issue 2 61222026L7-5B