Nortel SONET AccessNode Manual page 46

2-28 DS3 tests, STS-1 tests, and optical in-bay tests
Procedure 2-3 (continued)
Testing optical protection switching
Step
28
29
30
31
AccessNode Vol 3B 323-3001-221 Issue 2.0
Action
Release the lockout on the OC-3/OC-12 interface circuit packs, allowing the
automatic switch by entering:
For OC-12 VTBM
lockout re <work/prot> <unit> ↵
for example:
lockout re prot g1
You are prompted to confirm the command.
y ↵
For OC-12, VTBM, the OC-12 Protection screen displays a dot (.) in all
protection columns. G1 and G2 both remain active with green LEDs turned
on.
For other OC-3/OC-12, the OC-3/OC-12 G2 becomes active and the green
(Active) LED turns on. The OC-3/OC-12 Protection screen displays an
asterisk (*) in the Auto (automatic switch) field for the G1. The screen displays
a dot (.) in the Lockout field for interface circuit pack G2.
On the DS3/STS-1 receiver test set, press the Start/Stop button twice to reset
the error count to zero.
For OC-12 VTBM, the DS3/STS-1 test set indicates a high error count.
For other OC-3/OC-12, the DS3 test set indicates "in process" and displays 0
bit error.
To verify that DS3 or STS-1 continuity is restored, press the Single Bit Error
Inject button three times on the DS3/STS-1 test set.
For OC-12 VTBM, the DS3/STS-1 test set indicates a high error count.
For other OC-3/OC-12, the DS3/STS-1 receiver test set displays 3 bit errors
received.
Reconnect the optical patch cord to the transmit (Out) connector of
OC-3/OC-12 G2 (for OC-12 VTBM) or G1 (for other OC-3/OC-12).
For OC-12 VTBM, the DS1 test set indicates "in process" and displays 0 bit
error. The OC-12 Protection screen displays a dot (.) in all protection
columns. G1 and G2 both remain active with green LEDs turned on.
For other OC-3/OC-12, the yellow loss-of-signal (LOS) LED goes off. The
screen displays a dot (.) in the Auto (automatic switch) field for the G1.
—continued—
For other OC-3/OC-12
lockout re ↵