DLP-
543
363-206-295
1997
December
1,
Issue
6
of
4
Page
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
MAIN
MAIN
MAIN
LGX
FN
O
L
I
U
FN
O
L
I
U
SONET
TEST
SET
fiber loopback
Direction
MUX
in
Signal
OC-3c
of
Test
Transmission
1.
Figure