Test Stratum 3 Clock (if used--S8700 Multi-Connect only)���
These procedures test the ability of the Stratum 3 clock to correctly provide timing and alarms to the media server.
CAUTION: The following procedures are destructive to DS1 data and should not be attempted while DS1 facilities are active.
Check for Red LEDs ��
- Turn on the Stratum 3 clock and wait 40-50 seconds to allow the system to complete the on-board diagnostics before checking LEDs.
- If there are any red LEDs, follow the procedures in Stratum 3 Clock LED Indicators.
Stratum 3 Clock LED Indicators �
| Card |
LED Label |
Procedure |
| PAI |
REF A |
Check that the CI circuit pack on the left is inserted properly. Check wiring for DS1 in carrier A which connects the media gateway to the CSU and the External Synchronization Clock at the MDF through a Y-cable assembly. If all else fails to clear the LED then replace the circuit pack. |
| PAI |
REF B |
Check that the CI circuit pack on the right is inserted properly. Check wiring for DS1 in carrier B which connects the media gateway to the CSU and the External Synchronization Clock at the MDF through a Y-cable assembly. If all else fails to clear the LED then replace the circuit pack. |
| PAI |
ST A |
Replace the ST3 card |
| PAI |
ST B |
Replace the ST3 card |
| CI |
FAIL |
Check wiring for its associated DS1 reference and replace the circuit pack if necessary |
| ST3 |
FAIL |
Replace the circuit pack |
| ST3 |
LOCK |
Ignore this LED |
| ST3 |
HOLDOVER |
Ignore this LED |
| ST3 |
FREE RUN |
Ignore this LED |
| TOCA |
FAIL |
Replace the circuit pack |
| TOCA |
PORT ALM |
Replace the circuit pack if necessary |
Verify Timing to the Media Server��
- To administer the Stratum 3 clock, type change synchronization and press Enter.
- Type 3 in the stratum field.
- Type the port network number where the TN780 Tone-Clock circuit packs reside in the port network field.
NOTE: Wait 1 minute for the software to reconfigure the media server synchronization.
- Verify the results of test 649. If test 649 fails with a code of 2101, then check the wiring for EXTSYN0 and EXTSYN1. Refer to the maintenance book for your configuration.
If test 649 is successful, then the media server is getting correct timing from the Stratum 3 clock.
