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call, GES circuit-mode services shall forward a "clear
back" event (BITE 25) to the interworking interface.
GES circuit-mode services shall then forward to the link
layer six "call progress - channel release" CM-LIDUs
via the C channel sub-band and perfonn the GES
outgoing C channel release guard procedure defined in
4.8.6.1.2.1.5; or
e) if a "call progress - channel release" CM-LLDU is
received, GES circuit-mode services shall forward a
"clear back event (BITE 25) to the interworking
interface and terminate all activities for the call.
4.8.6.1.2.1.5 GES orttgoing C chan~zel release guard.
When releasing a C channel which is in use for a groundorigination,
GES circuit-mode services shall do the following
when required elsewhere in 4.8:
a) if the C channel from-aircraft carrier terminates within
tG17 seconds after the last of the six "call progress -
channel release" CM-LDUs has been forwarded, GES
circuit-mode services shall terminate all activities for the
call; or
b) if the C channel from-aircraft carrier does not terminate
within tG17 seconds after the last of the six "call
progress - channel release" CM-LIDUs has been
forwarded, GES circuit-mode services shall forward to
the link layer twelve "call progress - channcl rclease"
CM-LIDUs via the C channel sub-band and one "call
progress - channel release" CM-LDU via the P
channel. If the from-aircraft carrier is not present.
terminate all activities for he call. Otherwise, if the C
channel from-aircraft carrier terminates within tG18
seconds after the tra~smission of the "call progress -
channel release" CM-LIDU via the P chmnel, GES
circuit-mode services shall terminate all activities for the
call. If the C channel from-aircraft carrier does not
terminate within the same tG18 second period, GES
circuit-mode services shall terminate all activities for the
call at the end of the pe,riod: or
Note.- The status of art irnterminuted from-aircruft
carrier should be posted to a monitoring function.
c) if a "call progress - channel release" CM-LIDU is
received, GES circuit-mode services shall await Lhe
termination of the C channel from-aircraft carricr. If thc
from-aircraft carrier is not present, terminate all
activities for the call; otherwise, if the C channel fromaircraft
carrier terminates within tG18 seconds after
receipt of the "call progress - channel release"
CM-LIDU, GES circuit-mode services shall terminate
all activities for the call. If the C channel from-aircraft
carrier does not terminate within this same period, GES
circnit-mode services shall krminate all activities for the
call at the end of the period.
Note.- The status of an untern~inatedf rom-aircraft
carrier should be posted to a monitoring ji~nction.
4.8.6.1.2.2 GES incoming circuit-mode procedure. This
procedure shall be defined by the following interrelated
procedures:
a) GES incoming circuit-mode call initiation -
4.8.6.1.2.2.1;
b) GES incoming bi-directional setup - 4.8.6.1.2.2.2;
c) GES incoming C channel establishment - 4.8.6.1.2.2.3;
d) GES incoming terrestrial completion - 4.8.6.1.2.2.4;
e) GES incoming C channel maintenance - 4.8.6.1.2.2.5;
and
f) GES incoming C channel release guard - 4.8.6.1.2.2.6.
4.8.6.1.2.2.1 GES incoming circuit-mode call initiatiorz.
Upon receipt from an AES of an "access request - telephone"
CM-LIDU with a unique application reference number, GES
circuit-mode services shall request GES management to assign
C channel resources at the C channel Q number value as per
Table 4-43.
Note.- This is to say that the Q number of the C channel
shall be inferred fronz the Q number used in the initial circuirmode
call signalling at the link layer:
GES circuit-mode services shall then do the following:
a) if a "call progress - channel release" CM-LIDU is
received prior to GES management assigning C channel
resources, GES circuit-mode services shall terminate all
activities for the call; or
b) if C channcl resources are not available, then GES
circuit-mode services shall forward to the link layer a
"call progress - call attempt result" CM-LIDU via the
P channel. GES circuit-mode services shall then await
tG9 seconds for the potential receipt of a repetition of
the original ''access request - telephone" CM-LIDU at
the current application reference number. If such an
2JlUM)
No. 75
Annex 10 - Aeronautical Telecommunications Volurne I11
additional CM-LIDU is received from AES circuit-mode
　
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