Table A-1. Hdsl4 Loopback Control Codes - ADTRAN H4TUC 3192 Installation And Maintenance Practice

Type Source
Abbreviated (N) ................ 3in7 (1110000)
(N) ................ 4in7 (1111000)
(N) ................ 2in6 (110000)
(N) ................ 3in6 (111000)
(C) ................. 6in7 (1111110)
(C) ................. 5in7 (1111100)
(C) ................. 4in6 (111100)
(C) ................. 5in6 (111110)
(N) ................ FF1E (1111 1111 0001 1110)
Wescom
(C) ................. 3F1E (0011 1111 0001 1110)
(N) ................ FF04 (1111 1111 0000 0100)
(N) ................ FF06 (1111 1111 0000 0110)
(C) ................. 3F04 (0011 1111 0000 0100)
(C) ................. 3F06 (0011 1111 0000 0110)
(N) ................ FF02 (1111 1111 0000 0010)
(C) ................. 3F02 (0011 1111 0000 0010)
(C) ................. FF48 (ESF-DL) (1111 1111 0100 1000)
(N) ................ 1in6 (100000)
(N) ................ FF48 (ESF-DL) (1111 1111 0100 1000)
(N/C) ............. 1in3 (100)
(N/C) ............. FF24 (ESF-DL) (1111 1111 0010 0100)
A-1 The Source column indicates which side of the interface the control codes are sent from. For example, an (N) indicates a network sourced code while
a (C) indicates a customer sourced code.
A-2 All codes are in-band unless labeled ESF-DL
A-3
All codes listed above must be sent for a minimum of 5 seconds to be detected and acted upon.
A-2

Table A-1. HDSL4 Loopback Control Codes

1 2, 3
Code
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
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
Loopback data from network toward network at HTU-R
Loopback data from network toward network at HTU-R
Loopdown everything
Loopdown everything
Name
61222404L1-5B