Loopback Control Codes - ADTRAN HTU-C NB Installation And Maintenance Practice

HTU-C using Narrowband/Wideband for Litespan Installation and Maintenance Practice

Loopback Control Codes

A summary of control sequences is given in Table A-1 and Table A-2.
In all control code sequences presented, the in-band codes are
shown left-most bit transmitted first, and the ESF data link codes
with right-most bit transmitted first.
Source (1) Code (Hex / Binary)
Network 3 in 7 (1110000)
(binary)
Network 4 in 7 (1111000)
(binary)
Network 2 in 6 (110000)
(binary)
Network 3 in 6 (111000)
(binary)
Customer 6 in 7 (1111110)
(binary)
Customer 5 in 7 (1111100)
(binary)
Customer 4 in 6 (111100)
(binary)
Customer 5 in 6 (111110)
(binary)
Network FF1E/
1111 1111 0001 1110
Customer 3F1E/
0011 1111 0001 1110
Network FF04/
1111 1111 0000 0100
Network FF06/
1111 1111 0000 0110
Customer 3F04/
0011 1111 0000 0100
A-2
Table A-1. HDSL Loopback Control Codes
Name
(2,3)
Abbreviated
Loopback data from network toward network in the HTU-R
Loopback data from network toward network in the HTU-C
Loopback data from network toward network in first HRE
Loopback data from network toward network in second HRE
Loopback data from customer toward customer in HTU-C
Loopback data from customer toward customer in HTU-R
Loopback data from customer toward customer in first HRE
Loopback data from customer toward customer in second
HRE
Wescom
Loopback data from network toward network at HTU-C
Loopback data from customer toward customer at HTU-C
Loopback data from network toward network at HRE 1
Loopback data from network toward network at HRE 2
Loopback data from customer toward customer at HRE 1
NOTE
61247002L1-5A