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Note I.- An aircraft opsmtor might choose to not
implement a discrete aimraft telephony signalling nehvark
external to the AES equipmnts. At their option, a "call control
agent" function could be integrated within the AES equipments
in such a manner as to elimimte the need for a discrete
aircmfc signalling network
Note 2.- In those cases wkm an AES is configured to
sustain more than one simultaneous ATS call, the aimmfi's
called terminul addresses should be configumd into one or
mom appmpriate "hunt groups". This will reduce the
incidence of gmund-originated calls to a spec@ called
wnninal being blocked by an engaged condition when an
equally appropriate called terminal is available,
8.2.4 GES TELEPHONY INTERWORKING
8.2.4.1 Relatiomhip of GES sigm11ing systems.
Figure A-19 of this guidance material depicts the relationship
between the GES circuit-mode procedures, their respective
interworking pmedures, and ground-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 interworking interface of the GES circuit-mode
procedures.
8.2.4.2 GES interworking telephony event definition. The
GES circuit-mode procedures interwork with terrestrial
network telephony signalling systems via the forward and
backward interworking telephony events defined in the
Standards. The GES circuit-mode procedures must map
specific interworking telephony events to specific protocol
interactions in the GES circuit-mode Iogic procedures where
interactions with a terrestrial network signalling system are
required. This mapping must also include parameter mapping
where indicated in the Standards.
8.3 Implementing satellite voice
in the ATS environment
8.3,l Overview. The AMS(R)S voice service has basic
operational attributes which fundamentally differ with
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Annex 10 - Aeronautical Telecomunlcations Volume llZ
prevalent very high frequency (VHF) and high frequency (HF)
voice operations. This will require close attention to how
satellite voice is implemented in a data link-oriented ATS
environment. These differences inctude a statistical delay in
speech channel establishment, a perceptible delay in speech'
propagation, circuit-switched operation, full-duplex optation,.
and the inability for aircraft to monitor communications
between the ground and othet aircraft. Additionally, the
AMS(R)S voice service places functional requirements on
terrestrial .facilities which are external to the. GES (e-g.
terrestrial networks and ACT: automation equipment) in order
to maximize its utility.
8.3.2 Channel establishment delay. Upon caIl origination.
each user must provide to its respective AES or GES the
teleph0& number of the &sired destination and then wait for
the system to establish a speech channel. This is in sharp
contrast with conventional radio operations where typically
each user maintains a continuous listening watch on a radio
channel. In addition, the channel establishment delay is
statistical in nature and is dependent upon the over-all traffic
load on the AMSS system.
8.3.3 Call annumiation. It is anticipated that aircraft
qxrators will integrate the satellite voice equipment with
other aircraft systems in a manner very similar to current VHT:
and HF radio equipment. This may lead to minor
inconsistencies in how voice calls are managed on different
aircraft. For instance, interwiring satellite voice equipment
with existing aircraft audio control panels may lead to
inherently halfduplex operation on certain aircraft even
though all of the intervening speech channels are full-duplex.
Incoming air-originated calls will, in many cases, be
annunciated to the aircrew via a SELCAL chime or other
audible indication, and will require a crew action to answer the
calI. This means that a groid user must await a positive
answer indication (e.g. crew voice response) before speech can
begin. Otherwise, there wwld be no assurance to the ground
user that the call is audible to the crew. This pmticular aspect
is quite important given the expectation that:
a) satellite voice calls will be very infrequent in a data link
oriented environment; and
b) the inability of an aircrew to monitor satellite voice
communications by other aircraft precludes positive,
routine assurance that the pmper aircraft audio panel
selections have been made.
8.3.4 Aimmft call management. Aircraft flight
management computer systems can be useful in managing
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