Canoga Perkins 2240 User Manual page 99

Step Symptom
3 Cable loss exceeds
modem loss budget.
4 Cable loss exceeds
modem loss budget.
5 Set the Remote Loopback switch on the near-end modem. Set up BERT
tester for the proper clocking, data rate and format as used with the
circuit. Use the existing interface cables if possible. Connect the BERT
tester in place of the near-end user device. Run the BERT test and go to
the next step.
6 Loopback test passes
but modems will not
pass data.
7 Loopback test passes
but modems will not
pass data.
8 Optically loopback
each modem and repeat
BERT test as detailed in
Step 5 of this procedure.
Modem fails BERT
test when optically
looped back to itself.
9 Set the Local Loop-
back switch on the
near-end modem.
Modem fails BERT
when looped locally
Possible Cause(s)
Defective
F/O cable
Defective Fiber
Optic Connectors
Modem not
configured
properly
Interface cables
damaged or mis-
wired.
Defective modem or
electrical interface
Defective modem or
electrical interface
2240 Fiber Optic Modem
Action
Repair or
replace defective
cable
Repolish or
replace defective
connector
Verify / correct
switch and strap
settings on modem
and devices
Repair damaged or
miswired cables
Replace defective
modem
Replace defective
modem
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