Nortel SONET AccessNode Manual page 75

Procedure 3-2 (continued)
Performing optical interface receiver sensitivity tests
Step
5
6
Action
CAUTION
Risk of damage to the optical receiver
For the NT7E02 OC-12 long-reach (LR) interface unit,
received optical power must not exceed the following safe
level: − 6.0 dBm. Refer to Site Installation Planning and
Engineering , 323-3001-200, in the Engineering,
Configuration, and Ordering Guide , Volume 1.
There are no damage levels for NT7E01 IR and LR,
NT7E02 IR, and NT7E05 IR and LR optical interfaces.
Adjust the VOA/mVOA so that the level indicated in the following table is read
on the optical power meter.
PEC
NT7E01CA/CB/CC/CD
NT7E01DA/DB/DC/DD
NT7E02KA/KB/KC/KD
NT7E02LA/LB/LC/LD
NT7E05AB/AC/AD
NT7E05BB/BC/BD
Note : The above values for the OC-12 VTBM optical interface circuit packs
are for a Nortel-to-Nortel proprietary link. For a link meeting the Bellcore
Midspan-meet specification, the following values apply.
NT7E05AB/AC/AD
NT7E05BB/BC/BD
If the requirement is not met, try the following in turn, and then repeat step 5:
• verify the optical power meter calibration
• make sure positive mating of fibers in optical connectors
Clean all optical connectors as per Network Element User Interface
•
Description, 323-3001-300, in Operations, Administration, and
Provisioning, Volume 4A.
Disconnect the optical patch cord or test cord from the optical power meter
and connect it to the receive connector of the G1 optical circuit pack.
—continued—
AccessNode Site Testing Procedures 323-3001-221 Issue 2.0
Tributary and optical tests for VTBM rings 3-13
Module
OC-3 LR
OC-3 IR
OC-12 LR
OC-12 IR
OC-12 VTBM LR
OC-12 VTBM IR
OC-12 LR VTBM
OC-12 IR VTBM
Minimum receiver
power (P )
R min
− 34.0 dBm
− 28.0 dBm
− 2.0 dBm
− 24.5 dBm
− 29.5 dBm
− 28.0 dBm
− 28.0 dBm
− 28.0 dBm