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AMSS voice channel provides a bi-directional audio path
which is inherently full-duplex. However, it is strongly
recommended that conventional (i.e. VHF-like) half-duplex
push-to-talk (PTT) operation be maintained in all aircraft
installations - but only to the extent that the flight crew must
actuate a FIT key in order to be heard by the grctund user. In
other words, to-aircraft audio should always be audible in
headphones without muting when the FIT key is actuated.
(Designers should still pay due attention to cockpit speaker
muting when a micropbne is keyed.) This will allow the crew
to manage the satellite voice conversation in consideration of
other concurrent flight deck activities. In addition, enforced
PIT 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 controller has
several satellite voice calls operating simultaneously.
8.3.8.1 Flight crews should be able to override enforced
halfduplex operation so they can take advantage of the fullduplex
voice channel when the operational situation warrants
(e.g. in-flight medical emergencies).
&4 Terrestrial vdce
network mmiderations
8.4.1 Overview. The AMSS SARPs provide for the
implementation of a shared, conimon-user terrestrial voice
switching network that intercomects 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 nonsafety
purposes (e.g. the public switched telephone network).
8.4.2 Access cunrmI. For air-originated calls, access to the
terrestrial safety network is achieved by the AES ending the
access quest signalling with a network-ID value of "10.
This value will indicate b 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
impbmentations should be subject to certification provisions
that ensure that it will not be possible for non-safety users on
an aircraft to gain access to the terrestrial safety network.
8.4.3 Routing analysis. Fox air-originated calls, the GES
will not analyze the ground address information contained
within an access request other than to interpret the network-lD
value for selection of the pmper terrestrial network (i.e. "10').
Upon receipt of the call indication from the GES, rhe
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 groundoriginated
calls, the originating facility must provide the
terrestrial safety network with the ID of the desired GBS 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 Cull muting functiorts. 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 muting. For air-originated calls, highlevel
routing consists of the ternstrial 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 proper 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 fmm 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 hen mute the cdl
within the facility based on the correlation results.
8.4.5 Terrestrial network implementation alternative.
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