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Cisco ONS 15501 User Guide
78-14134-01, Release 1.0
Chapter 1 Product Overview
Cisco ONS 15501 Front Panel
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The red FAIL LED turns on or off to reflect the following conditions:
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On: The pump laser bias, pump laser temperature, or power supply is out of tolerance. This LED
indicates a major internal failure, such as an overtemperature condition or a failure in the pump
laser or power supply.
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Off: The pump laser bias, pump laser temperature, and power supply are in the specified range.
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The yellow LOS LED turns on or off to reflect the following conditions:
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On: Input signal level is below the loss-of-input threshold.
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Off: Input signal level is above the minimum input power threshold.
