Nortel SONET AccessNode Manual page 45

Procedure 2-3 (continued)
Testing optical protection switching
Step
Testing lockout from switching
25
26
27
Action
Operate a lockout on the OC-3/OC-12 interface circuit packs by entering:
For OC-12 VTBM
lockout op <work/prot> <unit> ↵
for example:
lockout op prot g1
The screen displays a message warning that the command will affect service
and asks you to confirm the command. Enter:
y ↵
For OC-12 VTBM, the OC-12 Protection screen displays an asterisk (*) in the
LcktP field for G1. The lockout (LckOut) LED is lit on the maintenance
interface card (MIC).
For other OC-3/OC-12, the OC-3/OC-12 Protection screen displays an
asterisk in the Lockout field for optical interface G1. A hyphen (-) in the
Lockout field for G2 indicates that the lockout does not apply. The lockout (Lck
Out) LED is lit on the maintenance interface card (MIC).
Simulate a loss of signal by removing the optical patch cord from the transmit
(Out) connector of the OC-3/OC-12 G2 (for OC-12 VTBM) or G1 (for other
OC-3/OC12).
For OC-12 VTBM, the OC-12 Protection screen remains the same. G1 and
G2 both remain active with green LEDs turned on. Traffic does not switch to
G1.
For other OC-3/OC-12, the yellow loss-of-signal (LOS) LED on G1 turns on.
Traffic does not switch to G1.
To verify that DS3 or STS-1 signal continuity is 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 shows a high error count.
—continued—
AccessNode Site Testing Procedures 323-3001-221 Issue 2.0
DS3 tests, STS-1 tests, and optical in-bay tests 2-27
For other OC-3/OC-12
lockout op ↵