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amount of the adjustments of the values of the ElRP settings
for the Rd and T chantzels.
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 ERP setting of the transmit channel unit. Subsequent
adjustments to the EIRP setting shall be made according to the
BLRP adjustment values received from the GES in the GES
channel status report LIDUs.
Note.- All decisions about the power contror! and the
adjustments required for a C channel are made at the GES
through which 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 switcliing. In the
case of a level-3 AES, the single transmit chaunel unit shall. be
shared between the R!T 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 IUT 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 packetmode
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
Note.- This section deflnes the management functions
required at the GES to initiate and execute the log-on process
and to manage the data and voice communications between
the AES and the GES.
4.10.1.1 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
share the information about the status of each of its logged-on
AESs with all the other GESs supporting AMS(R)S services
through the same satellite.
4.10,2 GES management architecture
Anywhere within a satellite service area, an AES shall have at
least one unique P,,, channel available at 600 bitsls for
identification of the satellite and the beam supporting the P,,,
channel.
65 2111/00
No. 75
Annex 10 - Aeronautical Tel~communications Volume I11
4) voice channel characteristics;
There shall be communication between the GESs in the same
satellite service area to exchange infonnation as required for
carrying out the GES management functions specified in
4.10.4.
5) channel unit assigned (Q number, application
reference number);
6) channel unit pre-empted (Q number, application
reference number);
b) from circuit-mode services:
4.10.3 GES management interfaces
1) voice channel characteristics;
4.10.3.1 The GES management shall interface with he
subnetwork layer, circuit-mode services, link layer and
physical layer in order to exchange control information
required for CrES table management, log status management
and channel management.
2) request for frequency (Q number, application
reference number);
3) request for channel, unit (Q number, application
reference number).
4.10.3.2 SUBNETWORK LAYER
The following control, information shall be exchanged between
the GES managcmcnt and the subnetwork layer in the GES:
a) to subnetwork layer:
1) log status information:
ii) AES ID;
iii) GES ID;
2) minimum channel rate of T channel;
3) channel rate of Pd and Rd channels.
4.10.3.4.1 The control information exchanged between
the GES management and the link layer in the GES shall be
as in Table 4-45.
4.10.3.4.2 The information shall be exchanged in the form
of link interface data units (LIDUS). The LIDU shall contain
link interface control information (LICI) only.
Note.- Each LTDU received fmm the GES management is
mapped into a corresponding SU set in the link layer
according to 4.5.3.2.3.
4.10.3.5 PHYSICAL LAYER
The following control information shall be exchanged between
the GES management and the physical layer in the GES:
4.10.3.3 CIRCUIT-MODSEE RVICES
a) to physical layer (for each channel):
The following control information shall be exchanged between
　
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