Product specifications

A-2 Issue 1, November 2003 61181113L2-5A

1. The Source column indicates which side of the interface the control codes are sent from. 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 FDL.

3. All codes listed above must be sent for a minimum of 5 seconds to be detected and acted upon.

Table A-1. HDSL2 Loopback Control Codes

Type

Source

Code

2,3

Name

Abbreviated (N)

(N)

(C)

3in7 (1110000)

4in7 (1111000)

6in7 (1111110)

5in7 (1111100)

Loopback data from network toward network in the HTU-R.

Loopback data from network toward network in the HTU-C.

Loopback data from customer toward customer in HTU-C.

Loopback data from customer toward customer in HTU-R.

Wescom (N)

(C)

(N)

(C)

(N)

(N/C)

FF1E (1111 1111 0001 1110)

3F1E (0011 1111 0001 1110)

FF02 (1111 1111 0000 0010)

3F02 (0011 1111 0000 0010)

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 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)