TC8000 4 to 8CH Audio/Intercom
User's Manual
Rev. 7.0
MNL-80000-01-70
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Chapter 3 - Troubleshooting
General
The fiber optic link and/or the connectors are frequently the source of various problems. Check
out the connectors and the integrity of the link first. Ideally, the link should be calibrated for total
loss after the installation has been completed. This will accomplish two things. One, it will verify
that the total loss of the system is within the loss budget of the device. Two, it will provide a
benchmark for future testing. For example, a system that has been tested as having 6dBm total
loss when installed, and suddenly tests out as having a loss of 10dBm, obviously has a connector
or link problem.
Optic Loopback Test
At anytime you may use a short cable to loopback from Optic Tx to Rx. The analog or intercom
voice signal sent to RJ-11 pin 5 & 2 is looped back by fiber loop to pin 3 & 4.
For intercom channel, once loopback is setup, you can hear "echo" of you own voice from the ear
piece.
