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interworking interface, GES circuit-mode services shall
terminate all activities for the call; or
b) .if C channel resources are not available, GES circuitmode
services shall forward a "call unsuccessful -
network congestion" event (BITE 12) to the interworking
interface and terminate all activities for the
call; or
c) if C channel resources are available, GES circuit-mode
services shall forward to the link layer a "call
announcement" CM-LIDU followed immediately by a
"C channel assignment" CM-LIDU. GES circuit-mode
services shall then request GES management to activate
the previously assigned C channel unit on the
assigned frequency and then establish the C channel as
per 4.8.6.1.2.1.2.
4.8.6.1.2.1.2 GES outgoing C charznel establishment.
Where rquired elsewhere in 4.8, GES circuit-mode services
Part I Annex 10 - Aeronautical Te~ecommunications
shall do the following to establish a C channel for use in a
ground-origination;
a) if, within tG16 seconds after the latest transmission of
either the "call announcement" or "C channel assignment"
CM-LIDUS, a negative "telephony acknowledge"
CM-LIDU is received, GES circuit-mode
services shall again forward to the link layer the
missing CM-LDU indicated in the received CM-LIDU
and await an additional tG16 seconds; or
b) if nothing is received from AES circuit-mode services
within tG16 secmds after the latest transmission of
either the "call announcement" or "C channel assignment"
CM-LIDU, GES circuit-mode services shall
again forward to the link layer both of the CM-LIDUs
and await an additional tG16 seconds. If, after the
additional tG16 second period, nothing is received,
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 carrier is not
present, terminate all activities for the call; otherwise,
if the C channel from-aircraft camer does not terminate
within tG23 seconds after the first "call progress
- channel release" CM-LIDU was forwarded, GES
circuit-mode services shall again forward the
CM-LIDU. If the from-aircraft camer terminates
during either tG23 second period, GES circuit-mode
services shall terminate all activities for the caU. If the
from-aircraft carrier does not terminate by the expiry
of the second tG23 second penod, GES circuit-mode
services shall terminate all activities for the call; or
Note. - The status of an unterminated fromaircrafi
carrier should be posted to a monitoring
function.
c) if a "call progress - call attempt result" CM-LIDU is
received, GES circuit-mode services shall forward an
appropriate "call unsuccessful" event (BITES 12, 16.
or 17) to the interworking interface. Also, GES circuitmode
services shall wait 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 from-aircraft
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
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 an unterminated fromaircraft
carrier should be posted to a monitoring
function,
d) 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
followed by a "call progress - channel release"
CM-LIDU via the P channel. GES circuit-mode
services shall then perform the GES outgoing
C channel release guard procedure defined in
4.8.6.1.2.1.5; or
e) if a "call progress - test" CM-LIDU is received, GES
circuit-mode services shall forward to the link layer a
"call progress - test" CM-LIDU and then perform the
GES outgoing C channel continuity check procedure
defined in 4.8.6.1.2.1.3.
4.8.6.1.2.1.3 GES outgoing C channel continuity check.
When checking the circuit continuity of a C channel which is
to be used for a ground-origination, GES circuit-mode services
shall do the following:
a) if tC34 seconds have elapsed from the time that the
first "call progress - test" CM-LIDU was sent to
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