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muting when a microphone is keyed.) This will allow the crew
to manage the satellite voice conversation in consideration of
other concurrent flight deck activities. In addition, enforced
P?T operation will help ensure that the potential future use of
audio conferencing at a ground user workstation is not
impaired by uncontrolled cockpit ambient noise (i.e. from
"hot" microphones) in those instances where a contro1,ler has
several satellite voice calls operating simuLaneously.
8.3.8.1 Flight crews should be able to override enforced
half-duplex operation so they can take advantage of the fullduplex
voice channel when the operational situation warrants
(e.g. in-flight medical emergencies).
8.4 Terrestrial voice
network considerations
8.4.1 Overview. The AMSS SARPs provide for the
implementation of a shard, common-user terrestrial voice
switching network that interconnects each GES with one or
more ground facilities expressly for aeronautical safety
communications. This network can be composed of one or
more subnetworks operating in tandem to provide the appearance
of a single cohesive network service between GESs and
external ground facilities (e.g. ACF, aircraft dispatch, etc.)
This network should be separate and distinct from other
networks which may be attached to a GES for non-safety
purposes (e.g. the public switched telephone network).
8.4.2 Access control. For air-originated calls, access to
the terrestrial safety network is achieved by the AES encoding
the access request signalling with a network-ID value of "10.
This value will indicate to the GES that the call shall be
routed to the terrestrial safety network and that all specific
signalling information must be included with the call indication.
AES implementations should be subject to certification
provisions that ensure that it will not be possible for nonsafety
users on an aircraft to gain access to the terrestrial
safety network.
8.4.3 Routing analysis. For air-originated calls, the GES
will not analyze the ground address information contained
within an access request other than to interpret the network-ID
value for selection of the proper terrestrial network (i.e. "10").
Upon receipt of the call indication from the GES, the
terrestrial safety network must interpret the country and facility
code fields contained in the call information and route the call
to the proper facility as required. For ground-originated calls,
the originating faciliry must provide the terrestrial safety
network with the ID of the desired GES along with the other
call information (i.e. AES-ID, terminal-ID, and call priority)
when the call indication is conveyed to the network.
8.4.4 Call muting fwnctions. Call routing functions
external to the GES can be categorized as being either highlevel
routing between GESs and ground facilities, and lowlevel
routing carried out within a facility.
8.4.4.1 High-level routing. For air-originated calls, highlevel
routing consists of the terrestrial safety network interpreting
the country and facility codes which are contained in
the ground address and routing the call to the network's
terminus with the pmper facility. For ground-originated calls,
high-level muting consists of the terrestrial safety network
interpreting the GES-ID which was received in the call
information from the originating facility and routing the call
to the network's terminus with the proper GES.
8.4.4.2 Low-level muting. When an air-originated call
reaches the desired facility over the terrestrial safety network,
a low-level routing function within the facility must interpret
the agent code contained within the call information and then
route the call to the indicated ground user. It should be noted
that, if the agent code value indicates that the call must be
correlated with other aircraft information at the facility, the
low-level routing function must also interpret the AES-ID
contained within the call information and then route the call
within the facility based on the correlation results.
8.4.5 Terrestrial network implementation altermirive.
Particular .switching network architectures are not mandated
for the terrestrial safety network. For instance, individual
agreements between AMSS service providers and either
administrations or aircraft operators may provide for the
integration into the GES equipments of some or all of the
high-level routing functions. This would then require that the
GES perform the routing tasks described in 8.4.4.1 and route
calls to individual facilities via dedicated GES-to-facility trunk
　
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