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a) if neither a "call progress - test" CM-LIDU or a "call
progress - channel release" CM-LIDU are received
within a 2 6 seconds after the most recent "call
progress -test7' CM-LIDU has been forwarded, AES
circuit-mode services shall forward to the link layer
another "call progress - test" CM-LDU until any of
the following occur:
1) if neither a "call progress - test" CM-LLDU or a
"call progress - channel release" CM-LIDU are
received within tA41 seconds after activation of
the C channel unit, AES circuit-mode services
shall stop forwarding "call progress - test"
CM-LIDUs, shall then 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-LDU
is received within tA41 seconds after activation of
the C channel unit, AES circuit-mode services
shall 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 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 "call progress - test" CM-LIDU is received
within tA41 seconds after C channel unit activation,
AES circuit-mode services shall enable the
circuit path between the C channel unit and the
forward circuit of the aircraft network. AES
circuit-mode services shall then forward to the link
layer a positive "telephony acknowledge"
CM-LIDU via the C channel sub-band, forward an
"AMS(R)S call origination" event (FTTE 18) to the
interworking interface and await completion of the
call to the called terminal as per the AES incoming
aircraft completion procedure defined in
4.8.6.1.1.2.3.
4.8.6.1: 1.2.3 AES incoming aircrafr completion. Where
required elsewhere in 4.8, AES circuit-mode services shall do
the following in order to complete a call across the aircraft
network to the called terminal:
a) if one or more "call progress - test" CM-LIDUs are
received, AES circuit-mode services shall forward to
the link layer a positive "telephony acknowledge"
CM-LIDU via the C channel sub-band: or
b) if an "answer" event (BITE 22) is not received from
the interworking interface within tA42 seconds after
forwarding the "AMS(R)S call origination" event
(RTE 18). AES circuit-mode services shall forward a
"clear forward" event (FEE 22) to the interworking
interface, forward to the link layer six "call progress
- channel release" CM-LIDUs via the C channel subband
and terminate all activities for the call; or
c) if a "call progress - channel release" CM-LDU is
received within a42 seconds after forwarding the
"AMS(l2)S call origination" event (FITE 18), or if the
C channel is to be pre-empted for a higher priority
call, then AES circuit-mode services shall forward a
"clear forward" event (FITE 22) to the interworking
interface, forward to the link layer six "call progress
- channel release" CM-LLDUs via the C channel subband
and terminate all activities for the call; or
d) if an "answer" event (BITE 22) is received from the
interworking interface within tA42 seconds after
forwarding the "AMS(R)S call origination" event
(FITE la), AES circuit-mode services shall forward to
the link layer a "call progress - connect" CM-LIDU
and perform the AES incoming C channel maintenance
procedure defined in 4.8.6.1.1.2.4.
4.8.6.1.1.2.4 AES incoming C chanhel maintenance.
Where required elsewhere in 4.8, AES circuit-mode services
shall allow the end-to-end connection to continue while doing
the following to maintain a C channel:
a) if, within tA26 seconds after transmission of the latest
"call progress - connect" CM-LIDU, neither a positive
"telephony acknowledge" CM-LIDU is received
or a "clear back" event (BITE 25) is received from the
interworking interface, AES circuit-mode services shall
again forward to the link layer the "call progress -
connect" CM-LIDU via the C channel sub-band; or
b) if, within tA30 seconds after transmission of the first
"call progress - connect" CM-LDU, neither a positive
"telephony acknowledge" CM-LIDU is received
or a "clear back" event (BITE 25) is received from the
interworking interface, AES circuit-mode services shall
　
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