Nortel SONET AccessNode Manual page 39

Procedure 2-3 (continued)
Testing optical protection switching
Step
3
4
Action
CAUTION
Risk of increased optical errors
Received optical power should not exceed the overload
levels for optical interfaces meeting Nortel-to-Nortel
proprietary links:
NT7E01 OC-3 LR:
NT7E01 OC-3 IR:
NT7E02 OC-12 LR:
NT7E02 OC-12 IR:
The above overload levels also apply to optical interfaces in
a Bellcore TR-NWT-000253 Midspan-meet specification.
Adjust the mVOA to insert about 15 dB loss.
Disconnect the patch cord from the optical power meter and loop it back to
the receive (In) connector of the G1 OC-3/OC-12 interface circuit pack, as
shown below.
Out
Attenuated
optical test cord
OC-3/OC-12
circuit pack
—continued—
AccessNode Site Testing Procedures 323-3001-221 Issue 2.0
DS3 tests, STS-1 tests, and optical in-bay tests 2-21
–10.0 dBm
– 8.0 dBm
– 7.0 dBm
– 4.0 dBm
In In
Out Out
In
LOS LOS
Active Active
Fail Fail
FW-10549
In Out
Attenuated
optical test cord
OC-3/OC-12
circuit pack
PC-10549