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MX2800 M13 Multiplexer User Manual Loopbacks, Section 6
61200290L1-1G 6-9
4. DS2 LOOPBACKS
Once a number has been selected which corresponds with the DS2 to be tested, the DS2 menu in
Figure 6-12 on page 6-9 appears. The subsection following the figure provides a description and an
illustration of the DS2 Network loopback testing option. Select the appropriate DS2
Data Mode to end a
test in progress.
Figure 6-12. DS2 Loopback Menu
DS2 Network
A DS2 Network 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)