Specifications

Page 5–16
FOCUS System Manual
SUSPECTED
FAILURE
Broken fiber pair
(transmit and
receive)
Fractured fiber
Single fiber
broke
(Receive fiber of
Chassis 1)
FOCUS
Transceiver
Failure
EXPECTED TARGETS
FOCUS System Low
signal level on XCVR
FOCUS System Out of
sync error on XCVR
FOCUS System Low
signal level on XCVR
FOCUS System Out of
sync error on XCVR
FOCUS System Low
signal level on XCVR
FOCUS System Out of
sync error on XCVR
Note: Chassis which is
continually only
receiving yellow alarms
will probably not log
either of the above
targets.
Transceiver 1 Bad
Out of sync error on
XCVR
No transceivers detected
EXPECTED ERROR
COUNT ACTIVITY
CRC Error Counts, Sync
Alarms, and Low Signals,
constantly changing at
both ends of the failure.
CRCs error incrementing
about 20-30 each update.
Sync and LS incre-
menting about 40-55
each update.
CRC Error Counts, Sync
Alarms, and Low Signals,
changing at a slower
frequency than a
complete break.
CRC Error Counts, Sync
Alarms, and Low Signals,
constantly changing at
receive side of the failure
and only Yellow alarms
occurring at the transmit
side of the fiber in
question.
CRC Error Counts, Sync
Alarms, and Low Signals,
constantly changing on
both sides of the trans-
ceiver.
FURTHER TEST
TO PERFORM
Test the fiber light levels
at the receive end at the
patch panel of the
FOCUS chassis which is
recording Low signal
level. Test the fiber light
levels at the transmit end
at the patch panel to
determine the level being
output from the FOCUS
transmitter.
Test the fiber light levels
at the receive end at the
patch panel of the
FOCUS chassis which is
recording Low signal
level. Test the fiber light
levels at the transmit end
at the patch panel to
determine the level being
output from the FOCUS
transmitter.
Test the fiber light levels
at the receive end at the
patch panel of the
FOCUS chassis which is
recording Low signal
level. Test the fiber light
levels at the transmit end
at the patch panel: the
level being output from
the FOCUS transmitter
should be -3 to -40dB.
Test the fiber light levels
at the transmit end at the
patch panel: the level
being output from the
FOCUS transmitter
should be -3 to -40dB.
Table 5–5. Alternate Path Mode Failure Analysis.