Chapter 6. Diagnostics
6-8 MX2800 User Manual 61200290L1-1
Figure 6-9. Line Loopback Test
Digital Diagnostics
A
D
IGITAL
D
IAGNOSTIC
loopback loops the entire DS3 back to the
local loop side. The end effect of this test is a loopback of all T1/E1s
after being fully multiplexed and de-multiplexed to and from a
DS3. The incoming DS3 data is ignored and the outgoing DS3
stream is substituted in its place just prior to exiting the DS3 framer.
This test is illustrated in Figure 6-10.
Figure 6-10. Digital Diagnostics Loopback
Metallic Diagnostics
A
M
ETALLIC
D
IAGNOSTIC
loopback test loops the entire DS3 back to
the local loop side. The end effect of this test is a loopback of all T1/
E1s after being fully multiplexed and de-multiplexed to and from a
DS3, and passed through both directions of the DS3 LIU. During
this test, the incoming DS3 is disconnected from the DS3 receiver
and the outgoing DS3 signal is substituted in its place. See Figure
6-11 on page 6-9 for an illustration of this 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)
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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