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con#rmed its cnfiamitmer!t to license the technology for the
~nanufacture and sale of ueronautzcal equipment under
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basis.
4.8.6 AMS(R)S circuit-mode procedures
The AMS(R)S circuit-mode procedures comprise the
followi~lgf our functional areas:
a) For the AES circuit-mode services:
i) AES outgoing logic procedure (for air-originations);
and
ii) AES incoming logic procedure (for groundoriginations).
b) For the GES circuit-mode services:
i) GES outgoing logic procedure (for groundoriginations);
and
ii) GES incoming logic procedure (for air-originations),
4.8.6,l AhfS(R)S CIRCUIT-MODE
PROCEDURES
Note 1.- It is assumed that an AMS(R)S circuit-mode
service procedure will encode or interpret the relevant
parameters of any CM-LJDU being transmitted or received
without specifically stating the exact code values irz the
procedures contained herein. Speczjic requirements for
parameter encoding can be found in the intenvorking
telephony events mapping requirements defined in Apperdix 5
to Chapter 4.
Note 2.- The term "C channel resources" includes all
required C channel hardware and suficient transmitter power
to maintain a C channel.
4.8.6. I. 1 AES CIRCUIT-MODE LOGIC
Note.- The requirements for mapping between
interworking telephony events and CM-LIDUS by the AFS
outgoing and incoming procedures are defined in Appendix 5
to Chapter 4, Figures A5-1 to A5-I1 and A5-12 to A5-IS,
respectively. Circuir-mode configuration parameters (e.g. those
used in 4.8.6.1.1.1) are defined in Appendix 6 to Chapter 4.
4.8.6.1.1.1 AES outgoing circuit-mode procedure. Receipt
of an "AMS(R)S call origination" event (FlTE 18) at the
interworking interface shall cause AES circuit-mode services
to assign a unique application reference number to the call.
AES circuit-mode services shall then do the following:
a) if sufficient AES C channel resources are not available
and the blockage is attributable to calls operating at a C
channel priority equal to or greater than the current call
attempt, AES circuit-mode services shall return a "call
unsuccessful - network congestion" event (BlTJ3 12) to
the interworking interface and terminate all activities for
the call; or
b) if sufficient C channel resources are available or if at
least one of the calls causing the blockage is operating
at a C charnel priority less than the current call attempt,
AES circuit-mode services shall do the following and
then await a C channel assignment from GES circuitmode
services:
1) if the call priority is distresdurgency, AES circuitmode
services shall forward to the link layer nA21
"access request - telephone" CM-LIDUs; or
2) if the call priority is flight safety, AES circuit-mode
services shall forward to the link layer nA22 "access
request - telephone" CM-LIDUs; or
3) if the call priority is regularitylmeteorological, the
AES circuit-mode services shall forward to the link
layer nA23 "access request - telephone" CMLIDUs.
4.8.6.1.1.1.1 . AES circuit-mode services shalt do the
following while awaiting a response from GES circuit-mode
services:
a) if a response is not received from GES circuit-mode
services within tA50 seconds after the transmission of
the latest "access request - telephony9' CM-LIDU, the
AES shall command the selection of an R channel
frequency and then shall transmit the original quantity of
CM-LIDUS; provided that the total number of
retransmissions of the CM-LIDU series does not exceed
four. If, a50 seconds after the fourth retransmission of
the CM-LIDU series, no response has been received,
AES circuit-mode services shall return a "call
unsuccessful - line out of service" event (BITE 17) to
the interworking interface and terminate all activities for
the call; or
2/1Y00
No. 75
Part 1 Annex 10 - Aeronautical Telecommunications
b) if a "clear forwad" event (FlTE 22) is received at the
interworking interface, AES circuit-mode services shall
forward to the link layer a "call progress - channel
release" CM-LlDU via the R channel and terminate all
activities for the call; or
c) if the call attempt is to be pre-empted by a higher
' priority call, AES circuit-mode services shall foward a
"clear back" event (BITE 25) to the interworking
interface, forward to the link layer a "call progress -
channel release'' CM-LDU via the R channel, and then
terminate all activities for the call; or
　
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