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ASYNC/SYNC FIBER OPTIC MULTIPLEXOR
loopback test. If the Test LED comes ON and the Local Sync Loss LED
goes OFF, go to Step 3. If this doesn’t happen, try replacing the remote
unit:
A) If you don’t have a replacement unit, call your supplier.
B) If the system works fine with the replacement unit, the original remote
unit is probably faulty. Send it to your supplier for repair.
C) If the system doesn’t work even with the replacement unit, go to
Step 3.
3. Perform Steps 1 and 2 at the remote site (run the loopback tests from the
remote modem). If the fault is still not located, try replacing both the
remote and local units one at a time (if you haven’t done this already):
A) If you don’t have a replacement unit, call your supplier.
B) If the system works fine with one or the other replacement unit,
the original unit is probably faulty. Send it to your supplier for repair.
C) If the system still doesn’t work, the main-channel fiberoptic link
between the units might be broken or defective and should be checked.
If replacing the fiber cable doesn’t work, call your supplier.
6.3 Remote Sync Loss LED Is ON
Follow the same procedure as that for the Local Sync Loss problem,
but starting at the remote site.
Summary of Contents for MX880A
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