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AES circuit-mode services, GES circuit-mode services
shall forward a "call unsuccessful - line out' of
service" event (BITE 17) to the interworking interface
and forward to the link layer a "call progress -
channel release" CM-LIDU via the P channel, If the
from-aircraft canier is not present,. terminate all
activities for the call; otherwise, if the C channel frornaircraft
carrier does not terminate within tG23 seconds
after the first transmission of the "call progress -
channel release" CM-LIDU, GES circuit-mode services
shall again forward the CM-LIDU via the P channel
and await an additional tG23 seconds. If the fromaircraft
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
services shall terminate all activities for the call at the
.end of the period; or
Note.- The status of an untenninated fromaircrafr
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 services, GES circuit-mode services
shall do the following while simultaneously forwarding
to the link layer a "call progress -test7' CM-LIDU to
AES circuit-mode services every tG35 seconds:
1) if a "call progress - call attempt result" CMLIDU
is received, GES circuit-mode services shall
stop forwarding "call progress -testw CM-LIDUs
to AES circuit-mode services- GES circuit-mbde
Annex 10 - Aeronautical Xelecommunications Volume ZII
services shall then forward an appropriate "call
unsuccessful" event (BITE 12, 16 or 17) to the
interworking interface and await tG23 seconds for
the C channel from-aircraft carrier to terminate. If
the from-aircraft carrier is not present, terminate
all activities for the call; otherwise, if the fromaircraft
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 by the expiry of this period, GES
circuit-mode services shall terminate all activities
for the call at the end of the period; or
Note.- The status of an unterminated fromaircraft
carrier should be posted to a monitoring
frmction.
2) if a "clear forward" event (FITE 22) is received at
the interworking interface, GES circuit-mode
services shall forward to the link layer six "call
progress - channel release" CM-LIDUs via the
C channel sub-band, stop forwarding "call progress
- test" CM-LIDUs and then perfom the GES
outgoing C channel release guard procedure
defined in 4.8.6.1.2.1.5; or
forwarding "call progress - test" CM-LIDUs.
GES circuit-mode services shall then forward an
"address complete" event (BITE 5) and an
"answer" event (BITE 22) to the interworking
interface, forward to the link layer a positive
"telephony acknowledge" CM-LIDU via the
C channel sub-band, and pedorm the GES
outgoing C channel maintenance procedure defined
in 4.8.6.1.2.1.4.
4.8.6.1.2.1.4 GES outgoing C channel maintenance.
Where required elsewhere in 4.8, GES circuit-mode services
shall enable the circuit path between the forward circuit of the
terrestrial network and the C channel unit, and then do the
following to maintain the C channel:
a) if a "call progress - connect" CM-LIDU is received,
GES circuit-mode services shall forward to the link
layer a positive "telephony acknowledge" CM-LIDU
via the C channel sub-band. If an identical CM-LIDU
was not received previously during the GES outgoing
C channel establishment procedure defined in
4.8.6.1.2.1.2, GES circuit-mode services shall also
forward an "answer" event (BITE 22) to the interworking
intedace; or
3) if a "call progress - channel release" CM-LIDU b) if a "clear forward" event is received at the interis
received from AES circuit-mode services, GES worlung interface, GES circuit-mode services shall
circuit-mode services shall forward a "clear back" forward to the link layer six "call progress - channel
event (BITE 25) to the interworking interface and release" CM-LIDUs via the C channel sub-band. GES
stop forwarding "call progress -test" CM-LIDUs. circuit-mode services shall then perform the GES
GES circuit-mode services shall then wait tG23 outgoing C channel release guard procedure defined in
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