Maintenance Description
9-84 Issue 8.0 July 2002
OC-3/OC-12 Optical Parameters 9
The following OC-3/OC-12 optical parameters are monitored continuously to
detect degraded performance of the laser:
â– Laser Bias Current: This parameter indicates whether the system optics
are working within normal margins (in range or out of range). The
OC-3/OC-12 laser bias current varies widely with temperature because the
laser does not have a thermoelectric cooler to maintain a constant laser
temperature. Typical nominalized values are expected to range from 0.5 to
2, or even higher. The upper limit is 1.5 times the maximum (beginning of
life) laser bias current limit. There is no lower limit.
â– Optical Transmit Power: This parameter indicates whether the signal
power (facet power) generated by the laser is within normal margins (in
range and out of range). The upper limit is 0.8 dBm above the initial factory
(nominal) value, and the lower limit is 1.0 dBm below the initial factory
(nominal) value.
â– Optical Power Receive: This parameter indicates whether or not the
received optical power is currently within the nominal sensitivity limits of the
receiver (in range or out of range). The upper limit is −6 dBm (nominal),
and the lower limit is −35 dBm (nominal).
Threshold crossing alerts (TCAs) are generated if an OC-3/OC-12 optical
parameter exceeds the set thresholds. The generation of TCAs can be enabled or
disabled using the PERFORMANCE-Set-PM Threshold-Optics input.
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