Power Monitoring; Opt-Pre Amplifier Card-Level Indicators; Table 14-20 Opt-Pre Port Calibration; Table 14-21 Opt-Pre Amplifier Card-Level Indicators - Cisco ONS 15454 DWDM Installation And Operation Manual

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14.5.1 OPT-PRE Amplifier

The optical splitter has a ratio of 1:99. The result is that the power at the MON port is about 20 dB lower

than the power at the COM TX port.

14.5.1.3 Power Monitoring

Physical photodiodes P1, P2, P3, and P4 monitor the power for the OPT-PRE card. The returned power

level values are calibrated to the ports as shown in

The OPT-PRE amplifier has three card-level LED indicators, described in

Card-Level Indicators

Red FAIL LED

Green ACT LED

Amber SF LED

Cisco ONS 15454 DWDM Installation and Operations Guide, R4.7

Amplified spontaneous emissions (ASE) compensation in fixed gain mode

Full monitoring and alarm handling with settable thresholds

Optical safety features that include signal loss detection and alarming, fast power down control and

reduced maximum output power in safe power mode

Four signal photodiodes to monitor the input and output optical power of the two amplifier stages

An optical output port for external monitoring

The red FAIL LED indicates that the card's processor is not ready or that

there is an internal hardware failure. Replace the card if the red FAIL LED

The green ACT LED indicates that the OPT-PRE is carrying traffic or is

traffic-ready.

The amber SF LED indicates a signal failure or condition such as LOS on

one or more of the card's ports. The amber SF LED also illuminates when

the transmit and receive fibers are incorrectly connected. When the fibers are

properly connected, the light turns off.

CTC "Type" Name

Output COM (Total Output)

Output COM (Signal Output)

Card Reference

Calibrated to Port

December 2004