User manual

Chapter 5. Loop Back Testing
43 Version 1.2 Apr 2006
5.1 General
In this chapter we shall explain the functioning of the loop back modes available in the Fiber
Multiplexer. The loop back modes available include Local, Remote, and Remote Request Loop
Backs for the Optical interface and the secondary Optical interface (if redundant) as well as Local
Loop Back, Near End Loop Back, Remote Loop Back, and Request Remote Loop Back for the E1,
T1 and Data communication 4-Channel Port Cards.
5.2 Loop Back Modes
5.2.1 Optical Loop Back
* 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)