
Chapter 6. Loopbacks
6-10 MX2810 M13 User Manual 61185001L1-1
Figure 6-12. DS2 Loopback Menu
DS2 Network
A DS2 N
ETWORK
loopback test loops the selected DS2 back to the
network (DS3) prior to being passed through the M12/G.747 de-
multiplexer. All T1/E1s attached to that DS2 will receive data
normally, but all data inserted into the T1/E1s attached to the
selected DS2 will be ignored and replaced by the incoming DS2
network data. This test is illustrated in Figure 6-13.
Figure 6-13. DS2 Network Loopback Test
DSX-3
LIU
M23
MUX/DMUX
M12/G.747
MUX/DMUX
(1 of 7)
F
R
A
M
E
R
D
S
2
F
R
A
M
E
R
D
S
3
....
....
T1/E1 LIU
(1 of 28)
CODEC
(28 of 28)
CODEC
(1 of 28)
T1/E1 LIU
(28 of 28)
DSX-3
LIU
M23
MUX/DMUX
M12/G.747
MUX/DMUX
(1 of 7)
F
R
A
M
E
R
D
S
2
F
R
A
M
E
R
D
S
3
....
T1/E1 LIU
(1 of 28)
CODEC
(28 of 28)
CODEC
(1 of 28)
T1/E1 LIU
(28 of 28)
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