10BASE-FL Link Integrity Test

10BASE-FL MAUs and older FOIRL MAUs monitor the light level on a fiber optic link segment, to provide a link integrity test. Vendors can optionally provide a link light on the MAU to give you a visual indication of the link integrity status. If the link lights on the MAUs at each end of the link are lit when you connect a MAU to the segment, then you have an indication that the segment is connected correctly and that the optical loss is within acceptable limits. If the light level drops below that required for reliable data reception, the MAU will detect this condition and stop sending or receiving data over the link.

Quick Reference Guide to 10BASE-FL Fiber Optic Ethernet - 04 SEP 95

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