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the C channel is being established so that the over-all delay in
completing the call to the ground destination is minimized
from the viewpoint of the aircraft user.
8.1.4.2.2 The GES circuit-mode procedure monitors the
status of the from-aircraft C channel camer throughout the
call. Loss of can-ier for more than tG13 seconds will result in
termination of the call by the GES. When this happens, the
GES will send six '"all progress - channel release"
CM-LIDUs during this phase so as to ensure that the AES's
call state is cleared. If the AES camer were to reappear
(possibly indicative of anomalous propagation conditions nonconducive
to call continuance) the GES will attempt to again
clear the AES call by sending six additional "call progress -
channel release" CM-LIDUs on the C channel sub-band and
one on the P channel.
8.1.4.2.3 When the GES passes the forward call origination
to the selected ground network, it must also convey the
call priority and the AES and terminal IDS of the originator.
This will ensure that the ground network can be sensitive to
the call's priority during routing; and that the ground user is
always advised of the identity of the originator so as to
facilitate return calls to aircraft that a controller may not
otherwise be aware of. In those cases where a call is blocked
due to an engaged (busy) condition at the ground destination,
the GES may, as an option: (I) interpret a specific backward
signal from the ground network which indicates that the call
attempt has been recorded at the ground destination, and then
(2) forward a corresponding CM-LIDU to the AES. This is
accomplished by a specific combination of cause codes in the
"call progress -channel release" CM-LIDU and the BITE 16
telephony event at the interworking interfaces with the external
aircraft and terrestrial networks. This will serve to alert an
aircrew that a ground user has been alerted to the existence of
the unsuccessful call attempt and has been provided the
information necessary to initiate a return call at a later time.
8.1.5 GROUND-ORIGINATION PROCEDURES
8.1.5.1 Ground earth starion
(GES) procedure
8.1.5.1.1 Upon receipt of a call origination from a
ground network, the GES commences a ground-origination by
allocating GES resources to the call and then sending to the
AES via the P channel a "call announcement" CM-LID
followed by a "C channel assignment" CM-LID.T he GES will
then await receipt of the from-aircraft C channel carrier prior
to conducting a continuity check on the C channel sub-band.
The AES will initiate the continuity check by sending a "call
progress - test" CM-LIDU to which the GES will respond
with a "call progress - test"' CM-LIDU every tG35 seconds
until the call is either completed to the aircraft destination or
terminated unsuccessfully (e.g. destination busy, call clearing,
etc.). The AES will acknowledge receipt of a "call progress -
test" CM-LIDU, thereby completing the continuity check, by
sending either a positive 'telephony acknowledge" CM-LIDU
or a "call progress - connect" CM-LIDU. (The latter will
have been sent in lieu of the former if the aircraft user
answered the call immediately after the continuity check
procedure.) The GES will react to either CM-LIDU by
forwarding an "address complete" BITE to the ground network
and, in the case of the latter CM-LIDU, an "answzr" BITE as
well. At this point the talk phase of the call may proceed.
8.1.5.1.2 The GES will monitor the status of the C
channel for the duration of the call. If a "call progress -
connect" CM-LIDU is received during this phase and subsequent
to the completion of the continuity check phase, the
GES will forward an "answer" BITE to the ground network
and maintain the C channel. The GES monitors the status of
the from-aircraft C channel carrier throughout the call. Loss of
carrier for more than tG19 seconds will result in termination
of the call by the GES. When this happens, the GES will send
six "call progress - channel release'TM-LDUs during this
phase so as to ensure that the AES's call state is cleared. If the
AES carrier were to reappear (possibly indicative of
anomalous propagation conditions non-conducive to a usable
call) the GES will attempt to again clear the AES call by
sending twelve additional "call progress - channel release"
CM-LIDUs on the C channel sub-band and one on the
P channel.
8.1.5.1.3 If the GES receives a "call progress -channel
　
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