Lucent Technologies DDM-2000 OC-12 - Page 1564

DLP-543 363-206-295
1997December1,Issue6of4Page
Multiplexing Direction
Loopback can be
Multiplexing Direction
Demultiplexing Direction
Fiber
Loopback
Demultiplexing Direction
Internal Loopback
FAR END
LGX
External
Loopback
OLIU
LGX
or LGX external loopback
OLIU
Monitor
NEAR END
MAINMAIN MAIN
LGX
FN
O
L
I
U
FN
O
L
I
U
SONET
TEST
SET
fiber loopback
DirectionMUXinSignalOC-3cofTestTransmission1.Figure