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conclusion that the DVSI codec was statistically equivalent to
the BTRL codec under most conditions md that it was suitable
for operations in Cbe same envimnment, e.g. oceanic airspace.
Note.- Test ~ s u l t sha ve also shown that the use of noise
whctian or cancelling techniques for operation under high
propeller backgmd noise is recommended.
9. AIRCRAFT EARTH STATION
(GES) MANAGEMENT
table and the log-on confin table. The specifics of storing this
information in the AES are not regulated by the AMSS
SARPs, they are implementation dependent.
9.3.1.2 The information listed under "system table" is
provided by the GES, This information contajns the necessary
search frequencies to enable the AES to select a satellite, a
beam, and a GES in order to carry out the log-on procedure.
Thus, it is mandatory that this information be current in the
AES prior to logging on. The currency of the system table
infonnation is maintained at the AES by monitoring the
system table broadcast sequences transmitted by the GES as
stated in Annex 10, Volume III, Part I, Chapter 4, 4.9.3.2.3.1.
9.3.2 AES LOG STATUS MANAGEMENT
9,3.2.1 Satellite, beam a d GES selections
9.3.2.1.1 Depending on the geogsapK~callo ca6m of the
aircraft, the AES may have more than one option for the
selection of a satellite, beam, and GES combination. The
AMSS S A P S provide the flexibility of allowing the AES
management to select the most desirable combination at a
given time. The only requirement imposed on the selection is
the AES capability of receiving an adequate signal on the
selected GES P,, channel.
9.1 General
9.3.2.1.2 The information used by the AES management
Volume m, Part I* Chqt4ev r4 *9 defines the in making its selection is contained in the AES system table.
minimum set of requirements that the AES management must A GES is uniquely identified by the frequency of its P,
mM in order to ~OBW interoperabiiity. ?RI~sch apter of. the chmel msmined within apeific hamin ~F wwim Uea
pidance describes issues to the of a given satellite. A satellite is uniquely identified by one or
management SARPs. more sets of satellitelbeam-identifying P, channel fa-
9.2 AES management interfaces
The AES management is described in the AMSS SARPs as an
entity which interfaces to other A S entities, such as the link
md subnetwork layers. The interfaces are defined in tenns of
the information exchanged between the AES management and
these other entities and are shown in Figure A-20 of this
guidance material. No formats of the excf;gnged information
are specified in the AMSS SARPs. Such formats are
considered to be implementation dependent.
9.3.1 AES TABLE MANAGEMENT
9.3.1.1 lbo sets of information are requi~d to be
maintained by the AES. These sets of information are given in
the AMSS SARPs in the fonn of tables, namely the system
quencies. Each set contains at least two frequencies and is
associated with the ID of the beam within which the associated
P channels are transmitted. If the satellite identification is
ma& via the global beam (beam DO), the AES management
may further attempt to select a spot beam, if any exist. For a
satellite service area with spot beam only, the satellite
identification will be made via a spot beam, thus the satellite
and the spot beam selections are made concurrently.
9.3.2.1.3 AESs commonly have a pmgrammable awner
preference table by which there may be preferential selection
of certain systems, satellites, andlor GESs and communication
requirements. There are several criteria by which preferential
selection for log on can be made; e.g. service provider identity,
cost, service options. If this capability were misused (e.g. to
exclude particular systems, satellites or GESs), safety could be
derogated due to restricted availability of alternateldiverse
communication paths. If exclusion is permitted in an AES
owner preference table, it should be verified that khe safety
communication availability requirements for that aircraft's
installation are met.
Annex 10 - Aeronautical TaZecommunic~ns Volume 111
9.3.2.2.1 Log-on initiation. As prescribed by the AES
management AMSS SARPs, the log-on procedure could be
initiated by the receipt of a log-on command. The log-on
command could specify the GES andor the satellite to be
selected to log on. These AMSS SARPs specify neither the
source nor the format of such command. The source could be
external to the AES relaying the command to the AES
management on a specific interface. The format is
implementation dependent.
9.3.2.2.2 Lag-on mjection. Several reasons have been
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