Codec Line/Net; Remote Loopback; Figure 6-5. Digital Line/Network Loopback; Figure 6-6. Codec Loopback - ADTRAN MX2800 User Manual

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

Codec Line/Net

A C
T1/E1 in both the network and local loop directions. Both
loopbacks occur at the T1/E1 codec. Both the network and the local
loop side of the loopback are executed at the edge of the codec,
completely testing the M13 mux and the T1/E1 LIU. See Figure 6-6
for an illustration of this test.
DSX-3 DSX-3
D D
LIU LIU

Remote Loopback

A R
the far-end M13 multiplexer. If an MX2800 is located at the far end,
an A
L
OOPBACK
DS3 is configured for C-bit parity framing since it requires the
availability of the far-end alarm and control (FEAC) channel. See
ANSI T1.107.
6-4
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
D D
A A
R R
S S
M M MUX/DMUX MUX/DMUX
3 3
E E
R R
loopback performs a loopback of the selected
L /N
ODEC INE ET
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
L
EMOTE OOPBACK
N
NALOG ETWORK
is engaged. This loopback is only available when the
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 6-5. Digital Line/Network Loopback

CODEC CODEC
(1 of 28) (1 of 28)
(1 of 7) (1 of 7)
CODEC CODEC
(28 of 28) (28 of 28)

Figure 6-6. Codec Loopback

performs a loopback of the selected T1/E1 on
L is executed when a R
OOPBACK
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)
EMOTE
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