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that the GES should support voice channels for ATC and AOC
services and interface with public switched telephone network
or leased circuits at the option of the GES operator. The GES
should also have provision for the highest specified rate data
channels and interface with private or public switched
networks at the option of the GES operator. The number of
AESs that a GES can support depends upon the channel
loading and the channel frequencies allocated to a GES. The
loading on the channel should be such that the packet-mode
data transfer meets the performance requirements specified in
Annex 10, Volume 111, Part I, Chapter 4, 4.7.
GES-to-GES communicatio~li nk is used to transfer information
regarding the status of logged-on AESs to other GESs
within the same satellite service area. It is also to be used to
transfer the C channel access requests and C channel call
announcementstC channel assignments between the log-on
GES and the GES handling the particular call.
10.3 GES management interfaces
10.3.1 GES management interfaces to other GES entities
are defined in Annex 10, Volume HI, Part I, Chapter 4, 4.10
in terms of the information exchanged over these interfaces.
The format of the information exchanged is not specified; it is
implementation dependent.
10.3.2 The GES management interfaces with the link
layer to use its services to transfer the management LDUs to
its peer in the AES. The GES management interfaces with the
subnetwork layer to inform the subnetwork layer about the
AES connectivity. The GES management interfaces with the
circuit-mode services to pass the C channel frequencies and
channel units assigned to a circuit-mode call. The GES
management interfaces with the physical layer to control the
frequency and power of the transmitted and received channels
and to pre-empt the channel units for higher precedence voice
or data calls.
10.4 GES management functions
10.4.1 GES TABLE MANAGEMENT
10.4.1.1 The term "table" refers to the system information
stored at a GES. The information stored at the log-on
GES includes the status of logged-on AESs and the status of
AESs logged on to other GESs within the same satellite
service area. It also includes information about the satellite -
its identifying frequencies, its location, the beams supported by
the satellite, the GESs within the satellite service area and the
frequencies and bit rates of the P A , channels supported by
each GES within the satellite service area. The format and the
storage capacity for the information is not specified in the
AMSS SARPs; it is implementation dependent.
10.4.1.2 The AES system table specified in Annex 10,
Volume 111, Part I, Chapter 4, 4.10 can be used for any satellite
configuration. The initial search data for a satellite service
area served by a satellite with spot beams only will include
two satellite/beam-identifying P,,, channel frequencies for each
spot beam for satellite and beam identification. The initial
search data for a satellite service area served by a satellite with
other configurations may include two or more satellitdbeamidentifying
P, channel frequencies per satellite. The regional
data of the AES system table for a satellite service area served
by a satellite with spot beams only will include, for each
beam, the GES ID and the P,, and R,,, channel frequencies
supported by the GES in that beam. A GES supporting more
than one beam will appear under two different beam IDS with
a unique set of frequencies in each beam. The regional data of
the AES system table for a satellite service area served by a
satellite with a global beam will include the spot beam
identifying P channel for each spot beam supported by the
satellite, the GES ID for each GES within the satellite service
area and the P,,, and $, channel frequencies supported by
each GES in the global beam as well as the GES IDS for all
GESs supporting each spot beam.
10.4.1.3 AES log-on srabus table
The AES log-on status table maintained by a GES other than
the log-on GES contains information about each AES loggedon
to any GES within the same satellite service area. This
information can be used by a GES for call routing purposes
such as to reject a ground-initiated call request destined for an
AES not logged-on to any GES in the satellite service area or
to forward the call request to the GES to which the destined
AES is logged-on.
10.4.2 GES LOG-ON STATUS MANAGEMENT
10.4.2.1 Distress log-on
10.4.2.1.1 Upon receipt of a log-on request LIDU with
the "Q No. Of Application" field set to 15 (indicating AES in
　
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