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4.8.6.1.2.2.3 GES incoming C channel establishment.
Where required elsewhere in 4.8, GES circuit-mode services
shall do the following while awaiting the establishment of the
C channel:
Note.- Within this subsection, it is possible that signalling
events might be received from the terrestrial network.
Therefore, $any telephony interworking events are received ot
the interworking inteqace with the terrestrial network, they
should be held in queue for interpretation by logic specfled in
subsequent subsectio~a.
a) if an additional "access request - telephone" CMI,
IDU at the current application reference number is
received from AES circuit-mode services within tCj11
2/11/00
No. 75
Pa?? I Annex 10 - Aeronautical Telecommunications
seconds after the latest "C channel assignment" CMLIDU
has been forwarded to the link layer, GES circuitmode
services shall again forward the "C channel
assignment" CM-LIDU to M S circuit-mode services;
or
b) if a "call progress - channel release" CM-LIDU is
received within tGll seconds of C channel unit
activation, GES circuit-mode services shall stop
forwarding "call progress - test" CM-LIDUs and
forward a "clear forward event (FITE 22) to the
interworking interface. (If additional "call progress -
channel release" CM-LIDUs are received, GES circuitmode
services shall ignore them.) GES circuit-mode
services shall then wait tG24 seconds after receipt of the
"call progress - channel release" CM-LIDU for the C
channel from-aircraft carrier to terminate. If the fromaircraft
camer is not present, terminate all activities for
the call; otherwise, if the C channel from-aircraft carrier
terminates within the tG24 second period, GES circuitmode
services shall terminate all activities for the call.
If the C channel 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 the unterminated fmm-aircrafr
carrier should be posted to a monitoring function.
c) if a "call information - service address" CM-LIDU is
not received within tGll seconds after the latest "C
channel assignment" CM-LIDU has been forwarded to
the link layer, GES circuit-mode services shall forward
a "clear forward" event (F'ITE 22) to the interworking
interface and perform the GES incoming release guard
procedure defined in 4.8.6.1.2.2.6; or
d) if a "call information - service address" CM-LIDU is
received within tGll seconds after C channel unit
activation, GES circuit-mode services shall send "call
progress - test7' CM-LIDUs every tGlO seconds
indefinitely and perform the GES incoming terrestrial
completion procedure defined in 4.8.6.1.2.2.4.
4.8.6.1.2.2.4 GES incoming terrestrial completion. While
GES circuit-mode services is awaiting cornpletion of the call
across the terrestrial network it shall enablc the circuit path
between the C channel unit and the forward circuit of the
terrestrial network while simultaneously forwarding lo the link
layer a "call progress - test" CM-LIDU every tGlO seconds
indefinitely. It shall also do the following:
answers the call attempt, this will be indicated by receiptfrom
the terrestrial network o f an "answer" event (BITE 22) at the
interworking in teqace.
a) if the C channel from-aircralt carrier terminates for more
than tG13 seconds, GES circuit-mode services shall
forward a "clear fonvard" event (FITE 22) to the
interworking interface. After the F'ITE 22 event has bcen
forwarded, GES circuit-mode services shall stop
forwarding "call progress - test" CM-LIDUs. GES
circuit-mode services shall then forward to the link layer
six "call progress - channel release" CM-LIDUs via
the C channel sub-band. GES circuit-mode services
shall then perform the GES incoming release guard
procedure defined in 4.8.6.1.2.2.6; or
b) if either a "release incoming side" event (BITE 29) or a
"call unsuccessful" event (BITE 12, 14, 15, 16, 17 or
20) were received from the interworking inlerface, GES
circuit-mode services shall. stop forwarding "call
progress - test" CM-LIDUs. GES circuit-mode
services shall then forward to the link layer six "call
progress - channel release" CM-LIDUS via the C
channel sub-band. GES circuit-mode scrvices shall then
perform the GES incoming release guard procedure
defined in 4.8.6.1.2.2.6; or
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