A-4
Section 61246001L2-5, Issue 2
61246001L2-5B
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 Sequence .................... 1001 0011 1001 0011
An HDSL element must loop-down after receiving
this deactivation sequence for at least five seconds.
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.
Loop-Up Time-Out ......... programmable from the 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 for NIU Smartjack loop-down, or by the ESF
DATA LINK command, as described in
Transition
from Armed to Disarmed State
.
