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HDSL2 for General Distribution Installation and Maintenance Practice HDSL2 Loopback and Control Codes

61223HDSL2L2-5B A-3

Table A-2. In-Band Addressable Loopback Codes

(All codes listed below must be sent for a minimum of 5 seconds in order for them to be detected and acted upon.)

Function Code Source Code and Response

Arm 11000 (2-in-5 pattern) (N) If the pattern is sent from the network, the units

arm, and the H2TU-R loops back if Smartjack Loop-

back is enabled.

Disarm 11100 (3-in-5 pattern) (N/C) The H2TU-C is removed from the armed state. Any

units in loopback when the 11100 pattern is

received loop down. The

LBK LEDs extinguish on all

units.

H2TU-C

Network

Loopback

D3D3

(1101 0011 1101 0011)

(N) If the units have been armed and no units are in

loopback, the H2TU-C loops back toward the net-

work, 2 seconds of AIS (all ones) are sent, 5 seconds

of data pass, and then 231 bit errors are injected

into the DSX-1 signal. As long as the pattern contin-

ues to be sent, 231 errors are injected every 20 sec-

onds. When the pattern is removed, the unit remains

in loopback. If the pattern is reinstated, the injection

of 231 bit errors resumes at 20-second intervals.

If Smartjack Loopback is enabled, then the H2TU-R

can be in network loopback when the H2TU-C loop-

up codes are sent.

HRE

Network

Loopback

C741

(1100 0111 0100 0001)

(N) If an HRE is present, the units have been armed, the

HRE loops back towards the network, 2 seconds of

AIS (all 1s) are sent, 5 seconds of data pass, and

then 10 bit errors will be injected into the DSX-1 sig-

nal. As long as the pattern continues to be sent, 10

bit errors are injected every 20 seconds. When the

pattern is removed, the unit remains in loopback. If

the pattern is reinstated, the injection of 10 bit

errors resumes at 20-second intervals.

H2TU-R

Loopback

C742

(1100 0111 0100 0010)

(N) When set from the network, an HTU-R network loop-

back is activated and a 20-bit error confirmation is

sent every 10 seconds.

Loop

Down

9393

(1001 0011 1001 0011)

(N) When sent from the network, all units currently in

loopback loop down. Armed units do not disarm. In

order to behave like a smartjack, the H2TU-R does

loop down from a network loopback in response to

the 9393 pattern, if Smartjack Loopback is enabled.

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