Nortel SONET AccessNode Manual page 54

2-36 DS3 tests, STS-1 tests, and optical in-bay tests
Procedure 2-4 (continued)
Testing DS3 or STS-1 protection switching
Step
8
9
10
11
12
13
Testing lockout from switching (and automatic switching override)
14
15
AccessNode Vol 3B 323-3001-221 Issue 2.0
Action
Enter:
manual op g1 ↵
You are prompted to confirm the command.
y ↵
The appropriate protection screen displays an asterisk (*) in the Manual field
for the G1 circuit pack group.
Press the Start/Stop button twice to reset the error count to zero.
The DS3 /STS-1 test set indicates in process and displays 0 bit error.
To verify that DS3 or STS-1 continuity is maintained, press the Single Bit Error
Inject button three times.
The DS3/STS-1 test set indicates 3 bit errors received.
Release the manual switch on the first circuit pack by entering:
manual re g1 ↵
You are prompted to confirm the command.
y ↵
The screen displays a dot (.) in the Manual field for the G1 circuit pack group.
Press the Start/Stop button twice to reset the error count to zero.
The DS3/STS-1 test set indicates in process and displays 0 bit error.
To verify that DS3 or STS-1 continuity is maintained, press the Single Bit Error
Inject button three times.
The DS3/STS-1 test set indicates 3 bit errors received.
To verify that DS3 or STS-1 continuity is maintained, press the Single Bit Error
Inject button three times.
The DS3/STS-1 test set indicates 3 bit errors received.
Operate a lockout on the first working DS3/STS mapper or STS-1 interface
card by entering:
lockout op g1 ↵
You are prompted to confirm the command.
y ↵
The appropriate protection screen displays an asterisk (*) in the Lockout field.
Wearing antistatic wrist protection, remove the DS3/STS mapper or STS-1
interface card from its backplane connector.
Because you have locked out the first working mapper, the DS3 or STS-1
traffic cannot be rerouted to the protection mapper. Alarms are generated.
—continued—