User manual

Chapter 6. Loopbacks
6-4 MX2810 M13 User Manual 61185001L1-1
Figure 6-5. Digital Line/Network Loopback
Codec Line/Net
A C
ODEC
L
INE
/N
ET
loopback performs a loopback of the selected
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.
Figure 6-6. Codec Loopback
Remote Loopback
A R
EMOTE
L
OOPBACK
performs a loopback of the selected T1/E1 on
the far-end M13 multiplexer. If an MX2810 is located at the far end,
an A
NALOG
N
ETWORK
L
OOPBACK
is executed when a R
EMOTE
L
OOPBACK
is engaged. This loopback is only available when the
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.
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)