A-4
Section 61246026L6-5, Issue 2
61246026L6-5B
The disarming process ensures race-free operation of
HDSL element disarming and Smartjack loop-down.
Duration of the disarm sequence may need to exceed
24 seconds to allow detection and loop-down of up to
three HDSL elements and the Smartjack.
All HDSL elements can be commanded to move from
the armed state into the disarmed state by the ESF
DATA LINK disarming sequence used for NIU
Smartjack loop-down as follows:
ESF Disarm Sequence
0010 0100 1111 1111
for four repetitions per element in loopback
The disarming process ensures race-free operation of
HDSL element disarming and Smartjack loop-down.
Duration of the disarm sequence may need to exceed
16 repetitions to allow detections and loop-down of up
to three HDSL elements and the Smartjack. This
sequence will loop-down the Smartjack and the HDSL
element.
All HDSL elements will automatically move from the
armed state into the disarmed state when a default
timeout value of two hours is reached.
Arming Timeout
2 Hours
Loop-up State
In the loop-up state, the selected HDSL element
provides continuous loop-up of the DS1 signal.
However, the data flow is monitored for the in-band
deactivation sequence, the in-band disarming
sequence, and the ESF data link disarming sequence.
Also, a loop-up timeout value causes automatic return
to the armed state. All other control code sequences
are ignored in the loop-up state.
Transition from loop-up to armed state:
Any
HDSL element can be commanded to move from the
loop-up state into the armed state by a single in-band
16-bit deactivate control code sequence. The same
deactivation sequence as shown is used for all HDSL
elements.
Deactivation
After receiving sequence for > 5 seconds
Duration of the deactivation sequence may need to
exceed 18 seconds to allow detection and loop-down
of up to three HDSL elements. The deactivation
sequence does not disarm the HDSL elements. They
can still respond to activation sequence control codes.
All HDSL elements automatically move from the
loop-up state into the armed state when the selected
loop-up timeout value is reached.
Loopup Timeout
programmable from HTU-C at
None, 20, 60, or 120 minutes
Transition from loop-up to disarmed state:
All
HDSL elements can be simultaneously commanded to
move from the loop-up state into the disarmed state by
either the standard 5-bit in-band disarming sequence
used fro NIU Smartjack loop-down, or by the ESF
DATA LINK command, as previously described.
