ADTRAN 3192 H4TU-C, Installation And Maintenance Practice

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A-2 Issue 1, December 2003 61223404L2-5A
1. The Source column indicates from which side of the interface the control codes are sent. For example, an (N) indi-
cates a network sourced code while a (C) indicates a customer sourced code.
2. All codes are in-band unless labeled ESF-DL.
3. All codes listed above must be sent for a minimum of 5 seconds to be detected and acted upon.
Table A-1. HDSL4 Loopback Control Codes
Type
Source
1
Code
2,3
Name
Abbreviated (N)
(N)
(N)
(N)
(N)
(C)
(C)
(C)
(C)
3in7 (1110000)
4in7 (1111000)
1in6 (100000)
2in6 (110000)
3in6 (111000)
6in7 (1111110)
5in7 (1111100)
4in6 (111100)
5in6 (111110) 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 the HTU-R
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 (N)
(C)
(N)
(N)
(C)
(C)
(N)
(C)
(C)
(N)
(N/C)
(N/C) FF1E (1111 1111 0001 1110)
3F1E (0011 1111 0001 1110)
FF04 (1111 1111 0000 0100)
FF06 (1111 1111 0000 0110)
3F04 (0011 1111 0000 0100)
3F06 (0011 1111 0000 0110)
FF02 (1111 1111 0000 0010)
3F02 (0011 1111 0000 0010)
FF48 (1111 1111 0100 1000)
FF48 (1111 1111 0100 1000)
1 in 3 (100)
FF24 (1111 1111 0010 0100) 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 HRE1.
Loopback data from network toward network at HRE2.
Loopback data from customer toward customer at HRE1.
Loopback data from customer toward customer at HRE2.
Loopback data from network toward network at HTU-R.
Loopback data from customer toward customer at HTU-R.
Loopback data from customer toward customer at HTU-R.(FDL)
Loopback data from network toward network at HTU-R. (FDL)
Loopdown everything.
Loopdown everything. (ESF-DL)