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seconds of the original transmission. Failure to receive the
acknowledgement within tA30 seconds will cause the AES to
terminate the call.
8.2 Interworking 09 circuit-mode
semi- with other
v* networks
8.2.1 AMS(R)S circuit-nude pmerlsrres. A standardized
set of circuit-mode procedures w i t h the AES and GES
implement the AMS(R)S circuit-mode protocols and provide
specific interfaces with non-AMS(R)S telephony interworking
procedures. The A.MS(R)S circuit-mode procedures
correspond to specific AES and GES circuit-mode pmcesses
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
211 m
No. 75
Attachment A to Part I Annex 10 - AeronauiicaE Telecommunic~ns
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 extemal telephony system. ,
Interworking is the controlled transfer of signalling
information acmss 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 wried Wugh ,the use of a set of forward and
backward interworking telephone events (FITEs and BITES).
The intetworlcing telephone events that are used herein to
define the interworking protocol are a subset derived from the
standardized definitions contained in CCITT Recommendation
Q.608. Defining the interworking protocols on the basis of
H'T'Iis and BITES is in conformance with standard telephony
system prktice. It should be noted that the use of FITl3 and
BITES is merely a convenient nomenclature and in no way
places dependencies on specific equipment implementations.
8.2.2.1.1 FITE. A A is an event where telephony
signalling information is transferred in the forward direction
fmm 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 the
originating end of a call. Certain FlTEs 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 BlTB 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
mandato~y and optional infarmation elements pertinent to the
event (e.g. call attempt result information).
8.2.3 AES TELEPHONY INl'ERWORKING
8.2.3.1 Relatiomhip of AES signalling system.
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-mode procedures.
8.2.3.2 AES interworking telephony event denition. 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 circuit-mode procedures must map specific interworking
telephony events to specific protocol interactions in the AES
circuit-mode logic 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 Airrcraft 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.
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