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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 resuIt" CM-LIDU via the R channel and
terminate all activities for the call; or
4) if the related "call announcement" CM-LIDU is
received within tA27 seconds after the latest
transmission of the "telephony acknowledge" CMLIDU,
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-LIDU via the R channel
and terminate all activities for the call; or
ii) if the called terminal and C channel resources
are both availabIe, 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 from the Q
number used in the initial circuit-mode call
signalling at the link layer.
AES circuit-mode services shall then forward
to the link layer a "call progress -testm CMLIDU
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-LIDU was received,
AES circuit-mode services shall do the following:
1) if a "call progress - channel release" CM-LIDU
is received within tA25 seconds after receipt of the
"call announcement" CM-LIDU, AES circuit-mode
services shall terminate all activities for the call; or
2) if neither a "C channel assignment" CM-LIDU or
a "call progress - channel release" CM-LIDU
are received within tA25 seconds after receipt of
the "call announcement" CM-LIDU, AES circuitmade
services shall forward to the link layer a
negative "telephony acknowledge" CM-LIDU
(encoded to indicate that the "C channel
assignment" CM-LIDU is missing) via the R
channel and await their arrival for an additional
tA27 seconds. If neither of the CM-LIDUs anive
after tA27 seconds, AES circuit-mode services
shall again forward to the link layer the negative
"telephony acknowledge" CM-LIDU and await
an additional tA27 seconds; provided that the
total number of repetitions of the negative
"telephony acknowledge" CM-LLDU does not
exceed four. If neither of the CM-LIDUs are
received within tA27 seconds after the fourth
repetition of the negative "telephony
acknowledge" CM-LIDU, 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
3) if the call attempt is to be pre-empted for a higher
priority call, AES circuit-made 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
4) if a "C channel assignment" CM-LIDU is received
within either tA25 seconds after receipt of the "call
announcement" CM-LTDU or tA27 seconds after
receipt of the transmission of the latest negative
"telephony acknowledge" CM-LDU, AES circuitmode
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, U S 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
ii) If the called terminal and C channel resources
are both available, AES circuit-mode services
shall request AES management to allocate the
resources at a C channel Q number value as
per Table 4-43 and activate a C channel unit
on the assigned frequency. 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.
4.8.6.1.1.2.2 AES incoming C channel continuity check.
Where required elsewhere in 4.8, AES circuit-mode services
shall perform a C channel continuity check by doing the
following:
Part Z Annex 10 - Aeronautical Telecommunications
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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附件10--航空电信an10_v3_1ed(49)
