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discontinuity of both data and voice services. Therefore, the
use of such practice is not advisable as a means to invoke an
Attachment A & Part I Annex 10 - Aemuwti&nl Telecommunications
AES handover. The handover commands described in
Annex 10. Mlume IH, Par& I, Chapter 4, 4.9.3.3.4.2 b) and c)
provide a more controlled means to invoke AES handovers.
9.3.2.5.2 Because all R and T channel transmissions are
synchroniz& to the framing format of the P channel, and in
order to ensure positive control of the AES from the GES, such
transmissions must cease with the loss of the P channel.
SARPs would be to cease transmission on the C channel long
enough to transmit any higher precedence signal units in the
AES link layer and then reassip the transmit channel unit to
the C channel.
10, GROUND EARTH STATION
(GES) MANAGEMENT
9.3.3 CHANNEL MANAGEMENT
9.3.3.1 bice-voice pm-emption
9.3.3.1.1 Several circuit-mode calls could be contending
for the limited resources in the AES. In such cases, the
establishment and continuation of a circuit-mode call is
regulated by the priority and pre-emption requirement of
Annex 10, Volume III, Part I, Chapter 4, 4.8.3.2 according to
the precedence of the Q numkr assigned to the C channels
carrying the calls. The C channels Q number assignment for
the various categories of voice transactions is given in
Annex 10. Volume ILt. Part I, Chapter 4, Table 4-43.
9.3.3.1.2 Various requirements are included in the AMSS
SAWS in order to enforce the priority and pm-emption
statement of Annex 10, Cblume III, Part I, Chapter 4, 4.8.3.2
in the AF3S. In this regard, the circuit-mode services will only
request the assignment of a transmit/receive channel unit pair
from the AES management if, and only if, there are either
sufficient resources available or at least one of the circuitmode
calls in progress has at a Q number strictly lower than
the Q number of the call being established. In the latter case,
the AES management will make available the channel units
being used by the call in progress to support the call being
established.
9.3.32 Level 3 AES voicdhtu
arbitration
In a Level 3 AES, a single transmit channel unit is shared
among the R, T and C channels. The dimtion between the
R channel and the T channel is resolved in the AMSS SARPs
by considering that the T channel signal unit (SU)
transmissions, regardless of the Q number of the SUs, have
precedence over the SUs transmission on the R channel.
However, a minimum number of "gaps" in the T channel slot
reservations to a particular aircraft are required to ensure that
the R channel transmission are not totally blocked (Annex 10,
Volume III, Part I, Chapter 4, 4.6.5.3.3). Arbitration between
the C channel and the R or T channels is accomplished
according to the priorities of the transactions on these
channels. The specific requirements for such arbitration are
given in Annex 10. Volume III, Part I, Chapter 4, 4.9.3.4.1.4.
It should be noted that the AMSS SARPs do not require that
an established voice call be terminated if the transmission of a
higher precedence data message is required; rather, such action
is optional. An alternative scheme allowed by the AMSS
10. 1. 1 Ground earth station (GES) management functions
specified in Annex 10, Volume ID, Part I, Chapter 4, 4.10 are
mandatory for each GES implementation. The GES
management includes functions to manage the AES log-on to
a GES, to control the assignment of P, R and T channels for
data and signalling transfer, to reassign new channels on
detection of an excess loading on a channel, to assign C
channel frequencies on-demand, to control the power of the
assigned C channels, to update the system table and time
information in the AES and to verify the operational status of
its logged-on M s .
10.2 GF,S mauagement architecture
10.2.1 SATELLITSEE RVICE AREA
A service area of a satellite is defined as the satellite coverage
area within whlch a satellite provider provides services,
Different satellites can have overlapping satellite service areas.
The following are the three satellite system configurations:
a) Satellite with global beam only. In this configuration,
there is only one beam per satellite. This beam is
referred to as a global beam. In this configuration, two
GESs may be required per satellite in a satellite service
area to account for two satellite-identifying P,
channels for satellite identification.
b) Satellite with global beam and spot hams. In this
configuration, a satellite supports multiple beams with
　
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