Troubleshooting Access Type TDM Channel Modules
LED
Name
LED Colors Potential Cause Solution for Troubleshooting
NW, NE Yellow Loss of signal 1 Verify that fiber cables are connected.
2 Check optical power levels. Refer to
“Finding Your Problem - Follow the Light” on
p.53 in this document.
Optical Input Power out
of range
1 Measure the optical input power on the
receiver connector.
2 Compare the measured value with the
channel module/pluggable transceiver
specification.
3 Adjust the optical input power (i.e., install
the appropriate attenuators) to fulfill the
Optical Input Power requirements.
Loss of frame - No
frame sync detected
1 Verify that the provisioned service type
matches the incoming signal type.
2 Check optical power measurements. Refer
to “Finding Your Problem - Follow the Light”
on p.53 in this document.
Loss of input power -
Power non-existing or
below the defined
minimum level is
detected at the input.
Refer to “Finding Your Problem - Follow the
Light” on p.53 in this document.
Loss of output power -
Power non-existing or
below the defined
minimum level is
detected at the output.
Normally a
consequence of loss of
optical input power.
Also may be due to
failure/degeneration of
an internal component
or splice.
Refer to “Finding Your Problem - Follow the
Light” on p.53 in this document.
Yellow flashing
to off
Module is acting as
standby in channel card
protection; protection
path is not available
There is a problem with the fiber connectivity of
the protection path. Refer to “Finding Your
Problem - Follow the Light” on p.53 in this
document.
Table 41: LED Status of the 4TCA-PCN-4GU(S)+4G
262 FSP 3000R7 Maintenance and Troubleshooting Manual - Product Release 16.2 - Document Issue A
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