Table A-1. Hdsl Loopback Control Codes - ADTRAN HDSL DDM+ HTU-C Installation And Maintenance Practice

HDSL DDM+ Transceiver Unit for Central Office Installation and Maintenance Practice
Type Source
Abbreviated (N)
(N)
(N)
(N)
(C)
(C)
(C)
(C)
Wescom (N)
(C)
(N)
(N)
(C)
(C)
(N)
(C)
(C)
(N)
(N)
(N/C)
(N/C)
Note: The Source column indicates from which side of the interface the control codes are sent. For example, an
(N) indicates a network sourced code, while a (C) indicates a customer sourced code.
Note: All codes are in-band unless labeled ESF-DL.
Note: All codes listed above must be sent for a minimum of 5 seconds in order for them to be detected and acted
upon.
A-2

Table A-1. HDSL Loopback Control Codes

Code
3in7 (1110000) Loopback data from network toward network in the HTU-R
4in7 (1111000) Loopback data from network toward network in the HTU-C
2in6 (110000) Loopback data from network toward network in first HRE.
3in6 (111000) Loopback data from network toward network in second HRE.
6in7 (1111110) Loopback data from customer toward customer in HTU-C.
5in7 (1111100) Loopback data from customer toward customer in HTU-R.
4in6 (111100) Loopback data from customer toward customer in first HRE.
5in6 (111110) Loopback data from customer toward customer in second
HRE.
FF1E Loopback data from network toward network at HTU-C.
3F1E Loopback data from customer toward customer at HTU-C.
FF04 Loopback data from network toward network at HRE1.
FF06 Loopback data from network toward network at HRE2.
2F04 Loopback data from customer toward customer at HRE1.
3F06 Loopback data from customer toward customer at HRE2.
FF02 Loopback data from network toward network at HTU-R.
3F02 Loopback data from customer toward customer at HTU-R.
FF48 (ESF-DL) Loopback data from customer toward customer at HTU-R.
1in6 (100000) Loopback data from network toward network at HTU-R.
FF48 (ESF-DL) Loopback data from network toward network at HTU-R.
1in3 (100) Loopdown everything.
FF24 (ESF-DL) Loopdown everything.
Name
61247003L6-5A