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settings by communication with the physical layer and shall
relay these assignments and settings back to the circuit-mode
services. However, the AES management shall ensure that no
assigned frequencies are used for transmission that could
generate intemodulation products that produce harmful interference
to on-aircraft satellite navigation receiver operation and
shall pre-empt a lower priority call if necessary.
4.9.3.4.1.2.1 The AES management shall carry out the
randomized selection of R channel frequencies in response to
commands generated by protocols in the link layer, circuitmode
services and the AES management itself. Every selection
shall persist until another such random selection is made.
4.9.3.4.1.3 Channel unit power control. The AES
management shall control the EIRP settings of each of the
AES transmit channels via the AES management-physical
layer interface.
4.9.3.4.1.3.1 The AES management shall use the EIRP
setting in 4.2.3.5.5 for transmission of the log-on request
LIDU on the R,,, channel. Thereafter, the AES management
shall set the ERP on the R, channel to the initial ElRP setting
value communicated to it by the GES via the log-on confirm
LIDU. The T channel initial ElW setting shall be computed
according to the ratio of Rd channel and T channel channel
rates and the assigned % channel initial EW.
Note.- The log-on GES is responsible for determining the
amount of the adjustments of the values of the EIRP settings
for the R, and T channels.
4.9.3.4.1.3.2 For a C channel, the AES management
shall relay from the circuit-mode services to the physical layer
the initial EIRP setting of the transmit channel unit. Subsequent
adjustments to the EIRP setting shall be made according
to the EIRP adjustment values received from the GES in the
GES channel status report LIDUs.
Note.- All decisions about the power control and the
adjustrtlents required for a C c?mntzel are made at the GES
through whish the call is established and relayed to the AES
circuit-mode services on the C channel sub-band.
4.9.3.4.1.4 Level-3 AES channel unit switching. In the
case of a level-3 AES, the single transmit channel unit shall be
shared between the W channel mode and the C channel
mode of transmission.
4.9.3.4.1.4.1 The transmit channel unit shall be switched
to the IUr channel mode whenever not doing so would inhibit
the transmission of:
a) any packet-mode data SU with precedence higher than
the precedence of the circuit-mode call-in-progress; or
b) any link layer signalling SU associated with packetmode
data SUs of a precedence higher than the precedence
of the circuit-mode call-in-progress; -or
c) any call setup signalling SU associated with a circuitmode
call of a precedence higher than the precedence
of the circuit-mode call-in-progress.
4.9.3.4.1.4.2 The transmit channel unit shall be switched
to the C channel mode whenever not doing so would inhibit
the establishment or the continuation of a circuit-mode call
having a precedence higher than the precedences of all packermode
data SUs in the link layer and the precedences of the
packet-mode data SUs associated with all signalling SUs in the
link layer.
4.10 GROUND EARTH STATION
(GES) MANAGEMENT
4.10.1 General
Nore.- This section defines the management functions
required at the GES to initiate and execute the log-on process
and to maltage the data and voice communicatiotzs between
the AES and the GES.
4.10.1 .I The GES shall perform the set of functions
described in this section in order to establish and maintain
communications channels with its logged-on AESs and shall
Annex 10 - Aeronautical TelecommunicaCions Volume IZZ
share the information about the status of each of its logged-on a) to circuit-mode services:
AESs with all the other GESs supporting AMS(R)S services
through the same satellite. 1) log status information:
i ) logged-onllogged-off;
4.10.2 GES management architecture ii) AES ID;
iii) GES ID;
2) EIRP value;
Anywhere within a satellite service area, an AES shall have at 3) frequency assigned (Q number, application
least one unique P,,, channel available at 600 bit& for identi- reference number);
fication of the satellite and the beam supporting the P,,
channel. 4) voice channel characteristics;
5) channel unit assigned (Q number, application
reference number);
There shall be communication between the GESs in the same 6) channel unit pre-empted (Q number, application
satellite service area to exchange information as required for reference number);
carrying out the GES management functions specified in
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