Nortel SONET AccessNode Manual page 43

Procedure 2-3 (continued)
Testing optical protection switching
Step
16
17
18
19
20
Action
Out
Attenuated
optical patch cord
To verify that DS3 or STS-1 signal continuity is lost, press the Start/Stop
button twice, to reset the error count to zero.
The DS3/STS-1 test set indicates in process and displays a high error count.
Release the forced switch by entering:
forced re g2 ↵
y ↵
For OC-12 VTBM, G1 autoswitches to G2. The OC-12 Protection screen
displays an asterisk (*) in the Auto field of G1. G1 active LED light is turned
off, and G2 active LED remains on.
For other OC-3/OC-12, by releasing the forced switch, you make it possible
for an automatic switch to occur (from G1 to G2). G2 becomes active. The
green (Active) LED on G2 turns on.
Reconnect the optical test cord to the transmit (Out) connector on G1
OC-3/OC-12.
G2 OC-3/OC-12 remains active.
On the DS3/STS-1 test set, 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 DS3 or STS-1 continuity, press the single bit error inject button three
times on the DS3/STS-1 test set.
The DS3/STS-1 test set displays 3 bit errors received.
—continued—
AccessNode Site Testing Procedures 323-3001-221 Issue 2.0
DS3 tests, STS-1 tests, and optical in-bay tests 2-25
OC-3/OC-12
circuit pack
In
Out
In
LOS
Active
Fail
FW-10579
PC-10579