User Manual

211
MN024-08
TMRX/TSRX fibre optic troubleshooting
(The following procedure is summarized by the flow-chart in fig. 5.40b)
1. Check if there is any point where fibre experiences a short radius of
curvature. In this case, rearrange the optical path in order to avoid sharp
bends (if necessary, replace the optical cable with a longer one). If TMRX
(TSRX) red LED switches off, troubleshooting has been successfully
carried out. Otherwise, follow next steps.
2. Check if SC-APC connectors are properly installed at both fibre ends. In
case they are not, fix more firmly the SC-SPC connectors to their
adapters. If the TMRX (TSRX) red LED switches off, troubleshooting has
been successful. Otherwise, follow next steps.
3. Disconnect the optical fibre and clean it better at both ends, then clean
also the relevant SC-APC adapters. Re-connect the fibre to relevant ports
after cleaning. If it doesn’t make TMRX (TSRX) red LED switch off, follow
next steps.
4. Disconnect the fiber from the TMRX (TSRX) port, and measure the power
Pout which comes out from the fiber. Then, go to the module where the
other end of the fiber is connected (it can be either on the slave side and
on the master side, depending on the fiber or on the jumper you are
verifying), disconnect it and measure the input power Pin coming out of
the port. Calculate the fibre attenuation A due to the fiberoptics cable: Af
[dB] = Pin – Pout
a. If Af > 10 dB, then the fibre optic cable has some problems. Replace it
with a new one.
b. If Af < 10 dB troubleshooting procedure has not identified the
problem. Refer to supervision system or contact the manufacturer for
assistance.
TSRX3xx/8 module troubleshooting
Ordinary troubleshooting procedures which can be carried out on TMRX200
module first involve a check of the optical adapters status and of the
fiberoptics cables. If the alarm status still persists, a reboot of both the TMRX-
500 module and of the TSRX3xx/8 module can be performed so as to re-
inizialize the link.
Quick TSRX3xx/8 troubleshooting procedure
In case the red LED is ON, please follow these steps:
1. Clean the optical adapter
2. If the problem still persists, refer to the fibre optic troubleshooting so as to
check if the optical cable or optical connection has any problem.
3. If previous actions didn’t make the LED switch off, a reboot of both the
TSRX3xx/8 module and of the TMRX500 module (on the master side) could
be performed so as to test modem connectivity.
4. If the red LED still remains on, please check the alarm status by the LMT or
the supervision unit in order to better understand the problem and its
possible solution.
TILx-
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HLW