User manual

Chapter 5. Loop Back Testing
44 Version 1.2 Apr 2006
5.2.2 E1/T1 4-Channel Port Card Loop Back
* LLB (T1/E1 local loop back)
near end (NE) far end (FE)
* NELLB (near end local loop back)
near end (NE) far end (FE)
* RLB (T1/E1 remote loop back)
near end (NE) far end (FE)
* RRLB (request T1/E1 remote loop back)
near end (NE) far end (FE)