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attempt result" CM-LIDU which was previously
received within tA28 seconds after C channel unit
activation, AES circuit-mode services shall do the
following:
1) ensure that the repetitive transmission of the "call
information - service address" CM-LIDU has
ceased; and
2) forward an "answer" event (BlTE 22) to the interworking
interface and forward to the link layer a
positive "telephony acknowledge" CM-LIDU via
the C channel sub-band. If any additional "call
progress - connect" CM-LIDUs are received
, subsequent to the initial "call progress - connect"
CM-LIDU, AES circuit-mode services shall
respond to each by forwarding to the link layer a
positive "telephony acknowledge" CM-LIDU to
GES circuit-mode services; or
Note.- At this point the end-to-end call is
established.
d) if a "call progress - call attempt result" CM-EIDU
(encoded to indicate an "address complete" event) is
received, or if it arrives preceded by a "call progress
- test" CM-LTDU .which was previously received
within tA28 seconds after C channel unit activation,
AES circuit-mode services shall do the following:
1) ensure that the repetitive transmission of the "call
information - service address" CM-LIDU has
ceased: and
2) forward an "address complete" event (BITE 5) to
the interworking interface and forward to the link
layer a positive "telephony acknowledge" CMLIDU
via the C channel sub-band. If any additional
"call progress - call attempt result" CMLIDUs
are received subsequent to the initial "call
progress - call attempt result" CM-LIDU, AES
circuit-mode services shall -respond to each by
forwarding to the link layer a positive "telephony
acknowledge" CM-LIDU to GES circuit-mode
services; or
e) if C channel resources are pre-empted for a higher
priority call, AES circuit-mode services shall forward
to the link layer six "call progress - channel release"
CM-LIDUs via the C channel sub-band, return a "clear
back" event (BITE 25) to the interworking interface.
and terminate all activities for the call: or
f) if the C channel sub-band link layer commands the call
be terminated, AES circuit-mode services shall forward
a "clear back" event (BITE 25) to rhe interworking
interface and terminate all activities for the call.
4.8.6.1.1.2 AES incoming circuit-mode procedure. This
procedure shall be defined by the followirig interrelated
procedures:
a) AES incoming circuit-mode call initiation -
4.8.6.1.1.2.1;
b) AES incoming C channel continuity check, -
4.8.6.1.1.2.2;
c) AES incoming aircraft completion - 4.8.6.1.1.2.3;
and . .
d) AES incoming C channel maintenance -4.8.6.1.1.2.4.
4.8.6.1.1.2.1 AES incoming circuit-mode call initiation.
Upon receipt of either a "call announcerne?t" or "C channel
assignment" CM-LIDU with a unique application reference
'number, AES circuit-mode services shall do the following:
a) if a "C channel assignment" was received, AES
circuit-mode services shall forward to the link layer a
negative "telephony acknowledge" CM-LIDU
(encoded to indicate that the "call announcement" CMLDU
is missing) via the R channel and do the
following:
1) if neither a related "call announcement" CM-LIDU
or a "ca1.l progress - channel release" CM-LIDU
are received within tA27 seconds of the transmission
of the Iatest negative "telephony acknowledge"
CM-LIDU, AES circuit-mode services shall
forward to the link layer rhe negative "telephony
acknowledge" CM-LIDU via the R channel and
await their amval for an additional tA27 seconds;
provided that the total number of repetitions of the
"telephony acknowledge" CM-LIDU does not
exceed four. If neither of the aforementioned CMLIDUs
are received within tA27 seconds after the
fourth repetition of the "telephony acknowledge"
CM-LIDU, AES circuit-mode services shall
forward to the link layer a "call progress - call
attempt result" CM-LDU via the R channel and
terminate all activities for the call; or
Annex 10 - Aeronautical Telecommunications Volume ZII
2) if a "call progress - channel release" CM-LIDU
is received within tA27 seconds after the latest
transmission of the "telephony acknowledge" CMLIDU,
AES circuit-mode services shall. terminate
all activities for the call; or
　
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