Nortel SONET AccessNode Manual page 80

3-18 Tributary and optical tests for VTBM rings
Procedure 3-2 (continued)
Performing optical interface receiver sensitivity tests
Step
Testing OC-3 tributary receiver sensitivity
21
22
23
24
25
26
AccessNode Vol 3B 323-3001-221 Issue 2.0
Action
If not already connected, connect the SONET test set to the OC-3 tributary
circuit pack as follows:
a. Connect an optical test cord with mVOA between the output of the
SONET test set and the optical power meter.
b. Repeat step 5 to set the optical level to the minimum signal.
c. Disconnect the test cord from the optical power meter and connect it to
the receive connector of the OC-3 tributary circuit pack.
d. Connect a second optical test cord from the transmit (Out) connector of
the OC-3 circuit pack to the input of the SONET test set.
Perform steps 13 to 17.
Repeat steps 21 to 22 for each equipped OC-3 tributary circuit pack.
If you are not doing further DS1 or DS3 testing , then you do not require the
optical loopbacks:
a. Remove all optical patch cords and the SONET test set.
b. Reconnect optical patch cords between optical circuit packs and the fiber
patch panel.
Drop the STS-1 test connections by entering:
↵
endslat
Traffic is no longer carried.
If operated, release the lockout from the NT7E01 OC-3 and NT7E02 OC-12
optical circuit packs:
pr; dp <oc3 or oc12> <gx> ↵
The OC-3 /OC-12 protection screen appears.
lockout re ↵
y↵
The screen displays a period (.) in the Lockout column. The banner line is also
updated under the lockout column, and the "Lockout request" alarm is
cleared.
—continued—