CTC Union FMUX04 User Manual

Chapter 3. Operation
Loopback Descriptions
* LLB (Optical local loop back)
near end (NE) far end (FE)
* RLB (Optical Remote loop back)
near end (NE) far end (FE)
* RRLB (Request optical remote loop back)
near end (NE) far end (FE)
FEF (Far End Fault)
The FEF function lets the receiving unit advise the far end unit that it has lost the receive
optical signal.
1. Fiber Broken
2-2.FEF sent
3. FEF received
2-1. AIS sent
4. AIS sent
In a FEF enabled unit above, loss of received optical signal will result in an FEF signal being
sent to the far end unit, and AIS (Alarm Indication Signal) sent in both E1/T1 directions.
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CTC Union FMUX04 Specifications

General

Brand	CTC Union
Model	FMUX04
Category	Multiplexer
Language	English