User manual

Wide Bank 28 DS3 - Release 2.4 July 2004 7-43
Diagnostics & Troubleshooting
Testing DS3 Redundancy
4. Verify that the test set is still synchronized to the PRBS pattern.
5. Switch back to the primary DS3 Controller.
(B:Active)> switch
Switching control to Standby DS3 Controller
(A:Active)>
6. Repeat test, except this time pull the Primary DS3 Link cable instead of executing a manual
switch in step 5.
7. Verify that a switch-over has occurred to the secondary link. Note that although there were
errors received during the manual switch over, the error count should be less than those
encountered in the Electronics Protection test. For a description of “hitless” switching, see
Telcordia TR-TSY-752, chapter 8.
8. Reconnect the primary DS3 network link, and switch operation back to the primary DS3.
(A:Active)> switch
Switching control to Standby DS3 Controller
DS3 Electronics Protection Test
Verify that the test set encounters no errors when performing the following steps.
1. Pull out the primary Controller card.
2. Verify that a switch-over has occurred to the standby Controller.
3. Re-insert the primary Controller card.
4. Verify that no switch-over occurs.
5. Switch back to the primary Controller.
(B:Active)> switch
Switching control to Standby DS3 Controller
6. Pull out the secondary Controller card.
7. Re-insert the secondary Controller card.