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to specific AES and GES circuit-mode processes and represent
the highest level of functionality contained in the AMSS
SARPs. The interworking procedures, although physically
contained within the AES and GES equipment, represent the
initial "layer" of functionality immediately adjacent to and
external from the AMS(R)S circuit-mode procedures. The
interworking procedures represent the functional area where
specific conversions between the AMS(R)S circuit-mode
procedures and user or service provider-specific signalling
implementations are effected. The interworking protocol
between the AMS(R)S circuit-mode procedures and the
interworking procedures is defined using a standard set of
interworking telephony events.
8.2.2 Interworking with ext@ral telephony systems.
Interworking is the controlled transfer of signalling information
across the interface between different signalling systems where
the significance of the information is identical or where the
significance is translated in a defined manner.
8.2.2.1 Interworking protocol basis. The interworking
protocol is defined through the use of a set of forward and
backward interworking telephone events (FITEs and BITES).
The interworking telephone events that are used herein to
define the interworking protocol are a subset derived from the
standardized definitions contained in CCITI' Recommendation
Q.608. Defining the interworking protocols on the basis of
FlTEs and BITES is in conformance with standard telephony
system practice. It should be noted that the use of FITEs and
BITES is merely a convenient nomenclature and in no way
places dependencies on specific equipment implementations.
8.2.2.1.1 FITE. A FITE is an event where telephony
signalling information is transferred in the forward direction
from an incoming signalling system to an outgoing signalling
system. The "forward" direction of a FITE is referenced to the
fact that a FlTE propagates in a direction that is away from
Annex 10 - Aeronautical T~lecommunicah'ons Volume ZZZ
the originating end of a call. Certain FITEs may also carry
mandatory and optional information elements pertinent to the
event (e.g. address digits).
8.2.2.1.2 BITE. A BITE is an event where telephony
signalling information is transferred in the reverse direction
from an outgoing signalling system to an incoming signalling
system. The "backward'" direction of a BITE is referenced to
the fact that a BITE propagates in a direction that is toward
the originating end of a call. Certain BITES may also carry
mandatory and optional infomation elements pertinent to the
event {e.g. call attempt result information).
8.2.3 AES TELEPHONY INTERWORKING
8.2.3.1 Relationship of A ES signall ing systems. Figure
A- 18 of this guidance material depicts the relationship between
the AES circuit-mode procedures, their respective interworking
procedures, and aircraft-specific telephony signalling implementations.
In particular, the referenced figure defines both the
usage of "incoming" and "outgoing" procedures from the
viewpoint of the originating call party and the external interface
of the AES circuit-made procedures.
8.2.3.2 AES intenvorking telephony eventdefiition. The
AES circuit-mode procedures interwork with aircraft telephony
signalling systems via the forward and backward interworking
telephony events defined in the Standards. The AES circuitmode
procedures must map specific interworking telephony
events to specific protocol interactions in the AES circuitmode
togic procedures where interactions with an aircraft
signalling system are required. This mapping must also include
parameter mapping where indicated in the Standards.
8.2.3.3 Aircrufi telephony interworking. An on-aircraft
telephony network is not to be required to implement any type
or manner of physical network implementation. Any particular
implementation is at the option of the aircraft operator as long
as that implementation is made to interwork with the AES
circuit-mode procedure's interworking protocol.
Note 1.- An aircraft operator might choose to mt implement
a discrete aircrafr telephony signalling network external
to the AES equiprnents. At their option, a "call contml agent"
function could be integrated within the AES equipments in
such a manner as to eliminate the need for a discrete aircrafi
signalling network.
Note 2.- In those cases where an AES is configured to
sustain more than one simultaneous ATS call, the aircraft's
called terminal addresses should be conjgured into om or
more appropriate "hunt groups". This will reduce the incidence
　
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