Nortel Communication Server 1000 Series Manual page 141

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If the test results show a problem with communication across
the fiber-optic link, the problem can be in the fiber-optic link, link
connectors, or the far-end Fiber Remote Multi-IPE Interface.
Check the fiber-optic cables and optical connectors to verify that
they are properly connected.
Execute the T FI command again to check if the problem still
exists.
If the problem persists, disconnect the fiber-optic link from
the Fiber Remote Multi-IPE Interface optical connectors and
install the appropriate attenuated fiber-optic patchcord into the
RCV and XMIT optical connectors on the faceplate to create a
loopback.
Execute the T FI command again to check if the problem still
exists.
If the problem still exists, replace the Fiber Remote Multi-IPE
Interface unit.
If the problem is not detected, the problem must be in the
fiber-optic link.
Connect an optical power meter to the RCV connector on the link
and measure the received signal power.
If the power is between -30dBm and -8 dBm, the signal is being
received from the far-end.
If no signal is detected, check the fiber-optic link and ST optical
connectors. Check the splices and clean the connectors.
CAUTION
Keep the optical connectors absolutely clean.
Use pure isopropyl lint-free wipes to clean the ferrule
part of the optical connector and an aerosol duster to
blow out dust particles from the adapter part of the
optical connector.
Make sure that the ferrules in the optical connectors
are properly installed and aligned in their respective
adapters. This is particularly critical for the
single-mode fibers where tolerances are tighter.
To verify the integrity of the fiber-optic link, use a light source at
one end of the link and the power meter at the other to measure
the attenuation in the link, determining if each branch of the link
is meeting the expected signal attenuation.
If not, the link problem has to be corrected.
If the problem with the fiber-optic link has been corrected,
reinstall the link connectors into the Fiber Remote Multi-IPE
Interface ST faceplate connectors and execute the T FI
command again.
Nortel Communication Server 1000
Fiber Remote Multi-IPE Interface Fundamentals
NN43021-556 03.01
11 May 2009
Remote IPE fault isolation and correction 141