Nortel SONET AccessNode Manual page 59

Procedure 2-4 (continued)
Testing DS3 or STS-1 protection switching
Step
42
43
44
45
46
47
48
49
50
Action
Display the protection provisioning screen by entering:
protprov ↵
The appropriate protection provisioning screen is displayed.
Assign a high priority to the first circuit pack by entering:
priority g1 high ↵
Assign a low priority to the second circuit pack by entering:
priority g2 low ↵
Quit, to return to the appropriate protection screen and review the priorities
assigned to the DS3 or STS-1 groups by entering:
quit ↵
The G1 mapper should have high priority and the G2 mapper should have low
priority.
Wearing antistatic protection, pull the low-priority DS3/STS mapper or STS-1
interface card (G2) out of its backplane connector.
The DS3 or STS-1 traffic automatically switches to the protection mapper.
The DS3 or STS-1 protection screen displays an asterisk in the AutoSw field
for the low-priority mapper.
Press the Start/Stop button on the test set connected to the low priority unit
(G2) twice to reset the error count.
The DS3/STS-1 test set indicates "in process,"and displays an error count of
0.
To verify that DS3 or STS-1 continuity exists and that the DS3s/STS-1 are
rerouted from the G2 mapper to the protection mapper, press the single bit
error inject button three times.
The DS3/STS-1 test set indicates in process and indicates 3 bit errors
received.
Now leave the G2 mapper pulled out and pull the G1 (high-priority) mapper
out of its backplane connector.
The DS3s/STS-1s normally handled by the high-priority mapper are rerouted
to the protection mapper. The protection mapper cannot continue to handle
the DS3s /STS-1s from the low-priority mapper. Consequently, those
DS3s/STS-1s are lost.
To verify that the DS3s/STS-1 from the G2 mapper are lost, press the
Start/Stop button on the DS3/STS-1 test set twice, to reset the error count.
The DS3/STS-1 test set indicates in process and indicates a high error count.
Alarms are generated. The screen displays an asterisk (*) in the Auto field of
the high-priority circuit pack.
—continued—
AccessNode Site Testing Procedures 323-3001-221 Issue 2.0
DS3 tests, STS-1 tests, and optical in-bay tests 2-41