Digital Diagnostics; Metallic Diagnostics; Figure 6-9. Line Loopback Test; Figure 6-10. Digital Diagnostics Loopback - ADTRAN MX2800 User Manual

Chapter 6. Diagnostics
DSX-3 DSX-3
LIU LIU

Digital Diagnostics

A D
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.
DSX-3 DSX-3
D D
LIU LIU

Metallic Diagnostics

A M
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.
6-8
F F
M12/G.747 M12/G.747
R R
D D
A A
MUX/DMUX MUX/DMUX
S S
F F
M M
2 2
R R
E E
M23 M23
D D
A A
R R
S S
M M
MUX/DMUX MUX/DMUX
3 3
E E
R R
D
IGITAL IAGNOSTIC
F F
M12/G.747 M12/G.747
R R
D D
A A
S S MUX/DMUX MUX/DMUX
F F
M M
2 2
R R
E E
M23 M23
A A
R R
S S
M M
MUX/DMUX MUX/DMUX
3 3
E E
R R
D
ETALLIC IAGNOSTIC
MX2800 User Manual
CODEC CODEC
(1 of 28) (1 of 28)
(1 of 7) (1 of 7)
CODEC CODEC
(28 of 28) (28 of 28)

Figure 6-9. Line Loopback Test

loopback loops the entire DS3 back to the
CODEC CODEC
(1 of 28) (1 of 28)
(1 of 7) (1 of 7)
CODEC CODEC
(28 of 28) (28 of 28)

Figure 6-10. Digital Diagnostics Loopback

loopback test loops the entire DS3 back to
T1/E1 LIU T1/E1 LIU
(1 of 28) (1 of 28)
T1/E1 LIU T1/E1 LIU
(28 of 28) (28 of 28)
T1/E1 LIU T1/E1 LIU
(1 of 28) (1 of 28)
T1/E1 LIU T1/E1 LIU
(28 of 28) (28 of 28)
61200290L1-1