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时间:2010-07-20 23:38来源:蓝天飞行翻译 作者:admin
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seconds for the C channel from-aircraft carrier to 4.8.6.1.2.1.5; or
terminate. If the from-aircraft carrier is not present,
terminate all activities for the call; otherwise, if the
from-aircraft carrier terminates during the period,
GES circuit-mode services shall terminate all
activities for the call. If the from-aircraft carrier
does not terminate within this period, GES circuilmode
services shall terminate all activities fox the
call at the end of the period; or
Note.- The staius of an unterminated fmmaircrafi
carrier should be posted to a monitoring
function.
4) if a positive "telephony acknowledge" CM-LIDU
is received, GES circuit-mode services shall stop
forwarding "call progress - test" CM-LIDUs.
GES circuit-mode services shall then forward an
"address complete" event (BITE 5) to the interworking
interface and perform the GES outgoing
C channel maintenance procedure defined in
4.8.6.1.2.1 -4; or
5) if a "call progress - connect" CM-CIDU is
received, GES circuit-mode services shall stop
c) if the C channel from-aircraft carrier drops for more
than tG19 seconds, 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-LDUs via the C channel
sub-band and perform the GES outgoing C channel
release guard procedure defined in 4.8.6.1.2.1.5; or
d) if the C channel is to be pre-empted for a higher
priority 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 perform
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-LIDU 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.
Annex 10 - Aeronautical Telecommunications
4.8.6.1.2.1.5 GES outgoing C channel release guard.
When releasing a C channel which is in use for a groundoriginalion,
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-LIDUs 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 -
channel release" CM-LIDUs via the C channel subband
and one "call progress - channel release"
CM-LIDU 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 tG18 seconds after the transmission
of the "call progress - channel release" CM-LIDU
via the P channel, GES circuit-mode services shall
terminate all activities for the call. If the C channel
from-aircraft carrier does not terminate within the
same tGl8 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 unterminated fromaircraft
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 the
termination of the C channel from-aircraft carrier. If
the from-aircraft camer is not present, terminate all
activities for the call; otherwise, if the C channel fromaircraft
camer 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 circuit-mode services shall terminate all activities
for the call at the end of the period.
Note.- The status of an unterminated fromaircrafr
carrier should be posted to a monitoring
function.
4.8.6.1.2.2 GES incoming circuit-mode procedure. This
procedure shall be defined by the following interrelated
 
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