Metallic Loopback; Remote Loopback; Remote All T1/E1; Figure 6-11.Metallic Loopback Test - ADTRAN MX2800 M13 User Manual

Adtran network adapter user manual mx2800 m13
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Section 6, Loopbacks

Metallic Loopback

A Metallic 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
tion of this test.
The DS3 Line Length should be set to Short before performing this
loopback.
DSX-3
DSX-3
LIU
LIU

Remote Loopback

A Remote Loopback performs a loopback on the far-end M13 multiplexer. This loopback is available only
when the DS3 is configured for C-bit parity framing since it requires the availability of the FEAC channel.
See ANSI T1.107.
Local timing must be selected before initiating this loopback. If
necessary, it may be returned after loopback has been cancelled.

Remote All T1/E1

A Remote All T1/E1 loopback performs a loopback of all T1/E1 channels on the far-end M13 multiplexer.
If an MX2800 is located at the far end, an Analog Loopback is executed on all active channels simulta-
neously. The form of this loopback code sent to the far-end will depend on the framing mode being used.
When in C-Bit parity mode, the MX2800 will send loopback commands over the FEAC channel. When
operating in M13 framing mode, the MX2800 will send C-Bit loopbacks at the DS2 level.
6-8
NOTE
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
(1 of 7)
(1 of 7)
D
D
M23
M23
A
A
R
R
S
S
M
M
MUX/DMUX
MUX/DMUX
3
3
E
E
R
R
Figure 6-11. Metallic Loopback Test
NOTE
MX2800 M13 Multiplexer User Manual
Figure 6-11
on page 6-8 for an illustra-
CODEC
CODEC
T1/E1 LIU
T1/E1 LIU
(1 of 28)
(1 of 28)
(1 of 28)
(1 of 28)
CODEC
CODEC
T1/E1 LIU
T1/E1 LIU
(28 of 28)
(28 of 28)
(28 of 28)
(28 of 28)
61200290L1-1G

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