Table A-1. In-Band Addressable Loopback Codes - ADTRAN H2TU-C Installation And Maintenance Practice

Litespan H2TU-C Installation and Maintenance Practice

Table A-1. In-Band Addressable Loopback Codes

Function/Code
1 in 3 (100)
(1)
1 in 6 (100000) (1)
4 in 7 (1111000)
6 in 7 (1111110)
FF1E (1111 1111 0001 1110)
3F1E (0011 1111 0001 1110)
Arm/11000
(also known as a 2-in-5 pattern)
Arm/FF48 (1)
(1111 1111 0100 1000)
Disarm/11100
(1)
(also known as a 3-in-5 pattern)
Disarm/ FF24 (1)
(1111 1111 0010 0100)
H2TU-C Network Loop up/D3D3
(1101 0011 1101 0011)
H2TU-R Address 20 for extended
demarc/C754 (1)
(1100 0111 0101 0100)
Loop down/9393 (1, 4)
(1001 0011 1001 0011)
A-2
Response
Loop down everything
Loopback at the H2TU-R toward the network must be armed
before initiated
Loopback data from network toward network in the H2TU-C
Loopback data from customer toward customer in H2TU-C
Loopback data from network toward network at H2TU-C
Loopback data from customer toward customer at H2TU-C
The H2TU-R loops up toward the network. No AIS or errors
are sent as a result of this loopback. The H2TU-C arms.
(1)
When sent from the customer, this code arms all modules.
This pattern is sent on ESF facility data link. When sent
from the network, all modules are armed and an H2TU-R
network loopback is activated. This code has no
functionality when sent from the customer.
All modules are removed from the armed state and looped
down when the 11100 pattern is received. The
turn off on all modules.
This pattern is sent on ESF facility data link, and disarms
and/or loops down all modules.
If the modules have been armed and no modules are in
(1, 2)
loopback (3) , the H2TU-C loops up toward the network, 2
seconds of AIS (all 1s) are sent, 5 seconds of data pass, and
then 231 bit errors are injected into the DSX-1 signal. As
long as the pattern continues to be sent, 231 errors are
injected every 20 seconds. When the pattern is removed, the
module remains in loopback. If the pattern is reinstated, the
injection of 231 bit errors resumes at 20-second intervals.
When sent from the network, an H2TU-R network loopback
is activated and a 200-bit error confirmation is sent. Two
seconds of AIS (all 1s) is sent, 5 seconds of data pass, and
then 200 bit errors are injected into the DSX-1 signal. As
long as the pattern continues to be sent, 200 errors are
injected every 20 seconds. The HDSL2 office unit does not
block transmission of far-end NIU loopback from the
customer premise (H2TU-R).
All modules currently in loopback loop down, but remain in
the armed state.
LEDs
LBK
61221002L1-5F