Nortel SONET AccessNode Manual page 74

3-12 Tributary and optical tests for VTBM rings
Procedure 3-2 (continued)
Performing optical interface receiver sensitivity tests
Step
Connecting loopbacks on the feeder optics
4
AccessNode Vol 3B 323-3001-221 Issue 2.0
Action
DANGER
Risk of eye injury
Avoid direct exposure to laser beam or fiber. Invisible
light that can blind is present. Cap all optical connectors
that are not terminated.
To set up a protected loopback of the G1 optical circuit pack, set the optical
level before completing the connection.
If you are using a
high precision variable optical attenuator (VOA)
miniature in-line variable optical attenuator (mVOA)
a. At the fiber patch panel (FPP), disconnect the fiber coming from the
transmit (Out) connectors of the G1 optical circuit pack, and connect it to
the input of the VOA.
b. Use an optical patch cord to connect the output of the VOA to the optical
power meter. Go to step 5.
c. If you are using a patch cord with mVOA, connect the patch cord between
the transmit (Out) connector of the G1 optical circuit pack and the optical
power meter.
d. Make sure the mVOA is fully operational by following the instructions
provided in its shipping package.
—continued—
Then go to
substep a
substep c