CANOGA PERKINS 2240 Fiber Optic Modem - Manual (Page 99)

2240 Fiber Optic Modem
99
Step Symptom Possible Cause(s) Action
3 Cable loss exceeds Defective Repair or
modem loss budget. F/O cable replace defective
cable
4 Cable loss exceeds Defective Fiber Repolish or
modem loss budget. Optic Connectors replace defective
connector
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 Modem not Verify / correct
but modems will not configured switch and strap
pass data. properly settings on modem
and devices
7 Loopback test passes Interface cables Repair damaged or
but modems will not damaged or mis- miswired cables
pass data. wired.
8 Optically loopback
each modem and repeat
BERT test as detailed in
Step 5 of this procedure.
Modem fails BERT Defective modem or Replace defective
test when optically electrical interface modem
looped back to itself.
9 Set the Local Loop-
back switch on the
near-end modem.
Modem fails BERT Defective modem or Replace defective
when looped locally electrical interface modem