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Maintenance Description
Issue 1 December 1997 9-33
Optical Parameters 9
Performance Monitoring (PM) Enabling 9
Collection of optical parameters are initiated when a slot is equipped with an OLIU
circuit pack. Parameters continue to be available in reports and generate
appropriate TCAs until the OLIU is removed and the update command or the
UPD/INIT button is pressed.
Laser Bias Current 9
The laser bias current is monitored continuously to detect degraded performance
of the laser. A TCA is generated if the laser bias current exceeds a fixed threshold
of 1.5 times the nominal value. Laser bias current is monitored independently for
service and protection optical facilities. This parameter is monitored by the 21G/
21G-U, 23G/23G-U, and 23H/23H-U OLIUs.
Optical Transmit Power 9
The optical transmit power is monitored continuously to detect degraded
performance of the laser. TCAs are generated if the optical transmit power falls
below fixed thresholds of −1 dB and −2 dB. Optical transmit power is monitored
independently for service and protection optical facilities. This parameter is
monitored only by the 21G/21G-U OLIU.
OC-3 and OC-12 Section Parameters 9
Performance Monitoring (PM) Enabling 9
Collection of section parameters are initiated when a slot is equipped with an
OLIU circuit pack. Parameters continue to be available in reports and generate
appropriate TCAs until the OLIU is removed and the update command or the
UPD/INIT button is pressed.
Severely Errored Frame Seconds (SEFS) 9
This parameter counts the number of seconds during which an OOF, LOS, or
OLIU circuit pack failure occurred. SEFSs are counted and thresholded
independently for the service and the protection lines.
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