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await an additional tG16 seconds. If, after the additional
~G16s cco~dp criod, nodring is received, GES circuitmode
scrvices shall forward a "call unsuccessful - line
out of service" event (BITE 17) lo the interwolking
interface and forward to the link layer a "call progress - channel rclease" CM-LlDU via the P channel. If the
from-aircraft carriar is not present, terminate all
activities for the call; otherwise, if the C channcl fromaircraft
carrier does not kmlnate within tG23 seconds
after the first "call progress - channel release" CMLIDU
was forwarded, GES circuit-mode services shall
again forward the CM-LII3U. K the from-aircraft canjer
terminates during either tG23 second period, GES
circuit-modc services shall terminate all activities for the
call. If the from-aircraft carrier does riot ~ermii~abtye the
expiry of thc second tG23 second period, GES circuitmode
services shall. terminate all activities for the call;
or
Note.- The status of an unterminuted from-aircraft
currier should be posted to a nzonitoring filnction.
c) if a "call progress - call attempt result" CM-LIDU is
rcceived, GES circuit-mode services shall forward an
appropriate "call unsuccessful" event (BITES 12, 26, or
17) to the interworking interface. Also, GES circuitmode
services shall wait tG23 seconds for the C channel
from-aircraft cmier to terminate. I1 the from-aircraft
carrier is not present, terminate all activities for the call;
otherwise, if the from-aircraft carrier terminates by the
end of the period, GES circuit-mode services shall
terminate all activities for the call. If the from-aircraft
carrier does not terminate within the same period, GES
circuit-mode services shall terminate all activities for the
call at the end of the period; or
Note.-- The status of an untennir~atedfr om-aircraft
carrier should be posted to a monitoring function.
d) if a "clear forward event (FI?IE 22) is received at the
interworking interface, GES circuit-mode services shall
forward to the link layer six "call progress - channel
release" CM-DUs via the C channel sub-band
followed by a "call progress - channel release7'
CM-LIDU via the P channel. GES circuit-mode services
shall then perform the GES outgoing C channel, release
guard procedure defined in 4.8.6.1.2.1.5; or
c) if a "call progress - test" CM-LIDU is received, GES
circuit-mode services shall forward to the link layer a
"call progress - test" CM-LIDU and then perform the
GES outgoing C channel continuity check procedure
defined in 4.8.6.1.2.1.3.
4.8.6.1.2.1.3 GES outgoing C chanitel continuity check.
When checking the circuit continuity of a C channel which is
to be used for a ground-origination, GES circuit-mode services
shall do the following:
2/1U00
No. 75
Annex 10 - Aeronautica~ TeZecommunications Volume IZZ
a) if tG34 seconds have clapsed from the time that the first
"call progress - tesVTM-LIDU was sent to AES
cjrcuil-mode services, GES circuit-mode services shall
forward a "call unsucccssl'ul - line out of service"
event (BITE 17) to the interworking interface and
forward to the link layer a "call progress - channel
releasc" CM-LIDU via the P channel. If the fromaircraft
carrier is not present, terminate all activities for
the call; otherwise, if the C channel from-aircraft carrier
does not terminate within tG23 seconds after the first
transmission of the "call progress - channel release"
CM-LDU, GES circuit-modc services shall again
foiward the CM-LIDU via the P channel and await an
additional tG23 seconds. If the from-alrcraft carrier
terminates during either period, GES circuit-mode
services shall terminate all activities for the call. If the
from-aircraft carrier does not terminate by expiry of the
second period, GES circuit-mode scrviccs shall
temlinate all activities for the call at the end of the
period; or
Note.- The status of an untenninuted from-aircraft
carrier should be posted to a monitoring function.
b) if tG34 seconds have not elapsed since the time that the
first "call progress - test" CM-LIDU was sent to AES
circuit-mode scrviccs, GES circuit-mode services shall
do the following while simtaltmeously forwarding to the
link layer a "call progress - test" CM-LIDU 10 AES
circuit-mode serviccs every tG35 seconds:
3) if a "call progress - channel release" CM-LIDU is
received from AES circuit-mode services, CES
circuit-mode services shall forward a "clear back"
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