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some beams enclosed within another beam. The beams
enclosed within a beam are called spot beams and the
enclosing beam is referred to as a global beam. In this
configuration, two GESs may be required per satellite in
a satellite service area m account for two satelliteidentifying
P, channels for satellite identification. The
satellite-identifying P, channels for satellite identification
in this configuration are transmitted in the global
beam.
211 U00
No. 75
Annex 10 - Aeronautical Telecommunicaiions Volume IZZ
C) Satdllire with spot b~amon& In ffris configuration, the
satellite supports spot beams only, with no global beam.
In order that a satellitelbeam-identifying Pa, channel is
available throughout a satellite service area for satellite
and bearn identification, at least one P, channel
frequencies must be transmitted in each spot bearn in the
satellite service area. A GES in a satellite sewice area
can suppott more than one spot beam by transmitting
and receiving a unique set of frequencies in each spot
beam.
At a minimum, the GES should be capable of operating
through a space segment with a Level 4 AES. This implies that
the GES shouM support voice channels for mC and AOC
services and interface with public switched telephone network
or leased circuits at the option of the GES operatm. The GES
shwld 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 perfixmmce mqui~menbss pecified in
Annex 10, %hme ID, Part I, Chapter 4,4.7.
GES-to-GES communication link is used to transfer
information regarding the status of loggedon AESs to other
GESs within the same satellite service area. 1t is also to be
used to ttansfer the C channel access v t san d C channel
call announcemenfs/C channel assignments between the log-on
GES and the GES handling the particular call.
10.3.1 GES management interfaces to other GES entities
are defined in h e x 10. Volume IU, Part I, Chapter 4,4.10 in
terns 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 interface with the link
layer to use its services to m f e r the management LIDUS to
its peer in the M S . 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-Pnode 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 Atnetions
10.4.1 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 GEB
includes the status of logged-on AESs and the status of AESs
logged on to other GE3Ss 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 Pd,,, 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 SARF's; it is implementation dependent.
10.4.1.2 The AES system table specified in Annex 10,
Volume III, Patt I. Chapter 4,4.10 can be used for any satellite
configuration. The initial seatch data for a satellite service area
served by a satellite with spot beams may include two or more
wte1Lite-iden ti,fyPing channel frequencies per satellite plus
a spot beam map, indicating the geographical coverage of the
spot beams of that satellite. The regional data of the AES
system table for a satellite service area served by a satellite
with a global beam will include the GES ID for each GES
within the sateUite service area and the P, and 4, channel
frequencies supported by each GES in the global beam as well
as the services each GES supports in the global and spot
beams.
10.4.1,3 AES log-on statrrs table
The AES bg-on status table maintained by a GES other than
the log-on GES contains information a b u t each AES loggdon
　
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