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Annex 10 - Aeronautical Telecommunicatwns Volume 111
C channcl sub-band. If any additional "call progress
- call altempt result" CM-LIDUs are received
subsequent to Ihe 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 acknowledgc" CMLIDU
to GES circuit-mode services; or
ej if C channcl resources are pre-cmpted for a higher
priority call, AES circuit-mode services shall forward to
the link layer six "call progress - channel release" CMLlDUs
via the C channel sub-band, return a "clear back"
event (BITE 25) to the interworking interface, and
~crminatca ll aaivities for the call; or
f) i1 thc C channel sub-band link layer comr~landsth e call
be Lenninaeed, AES circuit-mode services shall forward
a "clear back" event (BITE 25) to the 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 following interrelated
procedures:
a) M S incoming circnit-mode call initiation -
4.8.6.1.1.2.1;
b) AES incoming C channel conrinuity 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 cixuit-mode call initiation.
Upon receipt of either a "call announcement" or "C channel
assignment" CM-LDU with a unique application reference
number, AES circuit-mode services shall do the following:
a) if a "C channel assignment" was received, AES circuitmode
services shall forward to the link layer a negative
"telephony acknowledge" CM-LIDU (encoded to
indicate that the "call announcement" CM-LIDU is
missing) via the R channel and do the following:
1) if neither a related "call announcement" CM-LI'DU
or a "call progress - channel release" CM-LIDU are
received within tA27 seconds of the transmission of
the latest negative "telephony acknowledge" CMLDU,
AES circuit-mode services shall forward to
the link layer the negative "telepllony acknowledge"
CM-LIDU via the R channel and await their arrival
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 CM-DUs are
received within tA27 seconds after the fourth
repetition of the "telephony acknowledge" CMLIDU,
AES circuit-mode services shall forward to
the link layer a "call progress - call attempt result"
CM-LIDU via the R channel and terminate all
activities for the call; or
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
3) if the call attempt is to be preempted for a higher
priority call, AES circuit-mode services shall forward
to the link layer a "call progress - call attempt
result" CM-LIDU via the R channcl and terminate all
activities for the call; or
4) if the relatcd "call announcement" CM-LDU is
received within tA27 secor~ds after the latest
transmission 3f the "telephony acknowledge" CMLlDU,
AES circuit-mode services shall do the
following:
i) if the called terminal is occupied with a call at a
priority higher than or equal to the current call
attempt, or if C channel resources are not
available, 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
ii) if the called terminal and C channel resources are
both available, AES circuit-mode services shall
request AES management to allocate C channel
resources and activate a C channel unit on the
assigned frequency 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 shall be inferred fronz the Q number
used in the initial circuit-mode call signalling at
the link layel:
AES circuit-mode services shall then forward to
the link layer a "call progress - test" CM-LIDU
and perform the AES incoming C channel
continuity check procedure in 4.8.6.1.1.2.2; or
b) if a "call announcement" CM-LWU was received, AES
circuit-mode services shall do the following:
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