Product specifications

A-2 Issue 3, December 2003 61223006L1-5C
Table A-1. HDSL2 Loopback Control Codes
Type
Source
1
Code
2,3
Name
Abbreviated (N)
(N)
(C)
(C)
3in7
(1110000)
4in7
(1111000)
5in7
(1111100)
6in7
(1111110)
Loopback data from network toward network in the H2TU-R.
Loopback data from network toward network in the H2TU-C.
Loopback data from customer toward customer in H2TU-R.
Loopback data from customer toward customer in H2TU-C.
Wescom (N)
(C)
(N)
(C)
(N)
(N)
(N/C)
(N/C)
FF1E
(1111 1111 0001 1110)
3F1E
(0011 1111 0001 1110)
FF02
(1111 1111 0000 0010)
3F02
(0011 1111 0000 0010)
1in6
(100000)
FF48 (ESF-DL)
(1111 1111 0100 1000)
1in3
(100)
FF24 (ESF-DL)
(1111 1111 0010 0100)
Loopback data from network toward network at H2TU-C.
Loopback data from customer toward customer at H2TU-C.
Loopback data from network toward network at H2TU-R.
Loopback data from customer toward customer at H2TU-R.
Loopback data from network toward network at H2TU-R.
Loopback data from network toward network at H2TU-R.
Loop down everything.
Loop down everything.
1
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.
2
All codes are in-band unless labeled ESF-DL.
3
All codes listed above must be sent for a minimum of 5 seconds in order for them to be detected and acted upon.