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- channel release" CM-LIDUs via the C channel
sub-band and terminate all activities for the call: or
3) if the C channel is to be pre-empted for a higher
priority call, AES circuit-mode sewices shall forward
a "clear forward event (HE 22) to the interworking
interface, foxward to the link layer six "call progress
- channel release" CM-LIDUS via the C chmel
sub-band and terminate all activities for the call: or
Note.- The above logic transitions monitor for
call clearing viu either a norm1 call clearing action
or an AES-initiated C channel pre-emption.
f) if the C channel sub-band link layer commands the call
be terminated, AES circuit-mode services shall forward
a "clear forward" event (FITE 22,) to the interworking
interface and termirate all activities for the call.
4.8.6.1.2 GES CIRCU!T-MmE LOGIC
Note.- The requirements for mapping between
interworking telephony events and CM-LIDUS by tfre GES
outgoing and incoming procedures are deftned in Appendix 5
to Chapter 4, Figures A5-19 to A5-27 and A5-28 to AS-40,
respectively.
(FITE 22) lo the interworking interface, forward to the 4.8.6.1.2.2 C;ES outgoing circuit-mode procedure. This
'jnk layer six '"11 progress - pl.ocedllre s,lall be defined by the fouowing hterrelated
LIDUs via h e C channel sub-band and terminate all procedures:
activities for the call; or
a) GES outgoing circuit-mode call initiation -
d) if the C channel is to be pre-empted lor a higher priority 4.8.6.1.2.1 .l;
call, AES circujt-mode services shall forward a "clear
forward" event (FMT 22) to the interworking interface, b) GES outgoing C channel establishment - 4.8.6.1.2.1.2;
forward to the link layer six "call progress - channel
release" CM-LlDUs via the C channel sub-band, and c) GES outgoing C channel continuity check -
terminate dl activities for the call; or 4.8.6.1.2.1.3;
-2-/11 /00
No. 75
Part I Annex 10 - Aerrrnautical Telecommunications
d) GES outgoing C channel maintenance - 4.8.6.1.2.1.4;
and
e) GES outgoing C channel release guard - 4.8.6.1.2.1.5.
4.8.6.1.2.1.1 GES outgoing circuit-mode call initiution.
Receipt of an "AMS(R)S call origination" event (F'ITE 18) at
the interworlung interface shall cause GES circuit-mode
services to assign a unique application reference number to the
call. If the AES is not logged on, GES circuit-mode services
shall forward a "call unsuccessful - send error indicalion"
event (BITE 20) to the interworking interface and terminate all
activides for the call; otherwise, GES circuit-modc servicas
shall request GES management to assign C channel resources
to the call 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
slzall he inferred from the Q number used in the initial circuitmode
call signalling at the link la ye^
GES circuit-mode services shall then do the following:
a) if a "clear forward" event (FITE 22) is received at the
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 -
ne~work congestion" event (BITE 12) to thc
interworlung interface and terminate all activities for the
call; or
c) if C channel resourccs 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 lo 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 channel establishment.
Where required elsewhere in 4.8, GES circuit-mode services
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-LIDU
indicated in the rcceived CM-LIDU and await an
additional tG16 seconds; or
b) if nothing is received from AES circuit-mode services
within tG16 seconds after the latest transmission of
either the "call announcement" or "C channel assignment''
CM-LDU, GES circuit-mode services shall again
forward lo the link layer both of the CM-LIDUs and
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