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4.8.6.1.2.2.6; or
c) if the C channel from-aircraft carrier terminates for more
than tG13 seconds, GES circuit-mode services shall
forward a "clear forward" event (FlTE 22) to the
interworking interface. GES circuit-mode services shall
then forward to the link layer six "call progress -
channel relcase" CM-LIDUs via the C channel sub-band
and then perform the GES incoming release guard
procedure defined in 4.8.6.1.2.2.6; or
d) if a "call progress - channel release" CM-LIDU is
received, GES circuit-mode services shall fonvard a
"clear forward" event (FITE 22) to the interworking
interface. (If additional "call progress - channel
release" CM-LDUs are received, GES circuit-mode
services shall ignore them.) If the from-aircraft carrier is
not present, terminate all activities for the call;
, otherwise, if the C channel from-aircraft canier does not
terminate within tG14 seconds after the receipt of the
"call progiess - channel release" CM-LIDU, GES
circuit-mode services shall terminate all activities for the
call. If the C channel from-aircraft carrier terminates
within the same tG14 second period, GES circuit-mode
services shall terminate all activities for the call at the
end of the period.
Note.- The status of an unterminated from-aircraft
carrier should be posted to a monitoring function.
4.8.6.1.2.2.6 GES incoming release guard. When
releasing a C channel which is in use for an air-origination,
GES circuit-mode services shall do the following when
required elsewhere in 4.8:
a) if the C channel from-aircraft carrier terminates within
tG12 seconds after the last of the six "call progress -
channel release" CM-LIDUs was forwarded, GES
circuit-mode services shall terminate all activities for the
call; or
b) if the C channel from-aircraft camer does not terminate
within tG12 seconds after the last of the six "call
progress - channel release" CM-LIDUs was
forwarded, GES circuit-mode services shall forward to
the link layer twelve "call progress - channel release"
CM-LIDUs via the C channel sub-band followed by one
"call progress - channel release" CM-LXDU via the P
channel. If the from-aircraft carrier is not present,
terminate all activities for the call. Otherwise, if the C
channel from-aircraft carrier terminates within tG14
seconds after the transmission of the "call progress -
channel release" CM-LDU sent via the P channel, GES
circuit-mode services shall terminate all activities for the
call. If the C channel from-aircraft carrier does not
telminate within the same tG14 second period, GES
circuit-mode services shall terminate all activities for the
call at the end of the period; or
Note.-- The stntus of an unterminated from-aircrafr
carrier should be posted to a monitoring function.
c) if a "call progress - channel release" CM-EIDU is
received, GES circuit-mode services shall await the
termination of the C channel from-aircraft carrier. If the
-2-/ 11/00
No. 75
Part I Annex I0 - A~eronautical Telecommunications
from-aircraft carrier is not present, terminate all
activities for the call; otherwise, if the C channel fromaircraft
carrier terminates within tG14 seconds after
receipt of the "call progress - channel release'' CMLIDU,
GES circuit-mode services shall terminate all
activities for the call. If the C channel from-aircraft
carrier does not terminate within the same tG14 second
period, GES circuit-mode services shall terminate all
activities for the call at the end of the period.
Note.- The status of an unterminated from-aircraft
carrier should be posted to a monitoring function.
4.8.7 ATS-specific terrestrial
network standards
Note.- Guidance material on aeronautical speech circuit
switching and signalling is contained in ICAO Circular 183 -
ATS Speech Circuits - Guidance Material -on Switched
Network Planning and in Attachment A to Part I.
4.8.7.1 Ciosed user group. The AMS(R)S voice service
inclusive of interconnecting aircraft and terrestrial networks
shall be considered a closed user group to the extent that it is
a non-public safety service to be accessible only by ATS and
AOC users and used strictly for the conveyance of safety
information.
Note.- The definition of a closed user group implies that a
private numbering plan is also in eflect. A telephony
numbering plan for the safety service need not conform to that
of the international public switched telephone network (PSTN)
as defined in CCITT Recommendation E.163.
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