Product specifications

61223006L1-5C Issue 3, December 2003 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 will arm, and the
H2TU-R will loop up if NIU Loopback is enabled.
Disarm 11100
(3-in-5 pattern)
(N/C) The H2TU-C is removed from the armed state. If any of the units are
in loopback when the 11100 pattern is received, they will loop down.
The LBK LEDs will turn off on all units.
H2TU-C
Network
Loop Up
D3D3
(1101 0011 1101 0011)
(N) If the units have been armed and no units are in loopback
4
, the H2TU-
C will loop up toward the network, 2 seconds of AIS (all ones) will be
sent, 5 seconds of data will pass, and then 231 bit errors will be
injected into the DSX-1 signal. As long as the pattern continues to be
sent, 231 errors will be injected every 20 seconds. When the pattern is
removed, the unit will remain in loopback. If the pattern is reinstated,
the injection of 231 bit errors will resume at 20-second intervals.
HRE
Network
Loop up
C741
(1100 0111 0100 0001)
(N) If an HRE is present, the units have been armed, the HRE will loop up
towards the network, 2 seconds of AIS (all 1s) will be sent, 5 seconds
of data will pass, and then 10 bit errors will be injected into the DSX-1
signal. As long as the pattern continues to be sent, 10 bit errors will be
injected every 20 seconds. When the pattern is removed, the unit will
remain in loopback. If the pattern is reinstated, the injection of 10 bit
errors will resume at 20-second intervals.
HTU-R
Loop up
C742
(1100 0111 0100 0010)
(N) When set from the network, an HTU-R network loopback 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 will loop
down. Armed units will not disarm. In order to behave like a
smartjack, the H2TU-R will not loop down from a network loopback
in response to the 9393 pattern if NIU Loopback is enabled.
Loopback
Time Out
Override
D5D6
(1101 0101 1101 0110)
(N) If the units are armed and this pattern is sent, the loopback time out
will be disabled. The time out option will be updated on the
Provisioning menu of the H2TU-R (viewable through the RS-232
port) to “None.” As long as the units remain armed, the time out will
remain disabled. When the units are disarmed, the loopback time out
will return to the value it had before the D5D6 code was sent. As long
as the pattern continues to be sent, errors are injected again every 20
seconds as follows:
H2TU-C 231 errors
H2TU-R 20 errors
Span
Power
Disable
6767
(0110 0111 0110 0111)
(N) If the units are armed and this pattern is sent, the H2TU-C will
deactivate its span power supply, turning off the H2TU-R. As long as
the pattern continues to be sent, the span power supply will remain
disabled. When the pattern is no longer being sent, the H2TU-C will
reactivate its span power supply, turning the remote unit(s) on. All
units will retrain and return to the disarmed and unlooped state.
4
If smartjack is enabled, then the H2TU-R can be in network loopback when the H2TU-C loop-up codes are sent.