Signalling link activity control state:
'undefined(1)' - link is an undefined state
'inactive(2)' - A Signalling link that is not in
operation.
'active(3)' - A Signalling link that is in
operation.
'activatingRestoring(4)' - A Signalling that is not operational
and is being activated or restored.
'failed(5)' - A Signalling link which is available
(not blocked) is marked by level 3 as
failed when a changeover order is
received.
'actT17wait(6)' - Link activation has failed. Link is
placed into this state to wait for timer
T17 to expire in order to avoid the
oscillation of initial alignment failure
and link restart.
'actAnsiWaitDeloaded(7) - Waiting for change back
acknowledgement (second attempt).
'actItuWaitStmReady(8)' Wait for Signalling Traffic
Management ready event.