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access (TDMA) channel, used in the from-aircraft direction
only. The receiving GES reserves time slots for uansmissions
requested by aircraft earth stations (AESs) according to
message length. The sending AES transmits the message in the
reserved time slots according to priority.
4.1.1.2.4 C channel. Circuit-mode single channel per
carrier (SCPC) channel, used in both to-aircraft and fromaircraft
directions. This channel is time division multiplexed to
provide a primary channel for voice or data traffic and a subband
channel for signalling, supervision and data messages.
The use of the channel is controlled by assignment and release
signalling at the start and end of each transaction.
4.1.2 General
4.1.2.1 When aeronautical mobile-satellite service
(AMSS), using near-geostationary orbiting satellites. is
installed and maintained In operation as an aid to air traffic
services, it shall conform with the provisions of 4.1 to 4.10.
4.1.2.2 Requirements for mandatory carriage of AMSS
equipment including the level of system capability shall be
made on the basis of regional air navigation agreements which
specify the airspace of operation and the implementation timescales
for the carriage of equipment.
4.1.2.3 The agreements indicated in 4. I .2.2 shall provide
at least two years' notice of mandatory caniage of airborne
systems.
4.1.2.4 Recommendation.- Civil aviation authorities
should co-ordinate, with national authorities and service
providers, those implenzentation aspects of AMSS which will
permit its world-wide irtteruperubility and optimum use, as
appropriate.
Note.- Provisiorzs 017 the allocation and assignment of
ICAO 24-bit aircruft addresses for use by rhe AMSS are
contained in Annex 10, Volume 1, Appendix C to Part I.
Part 1 Annex 10 - Aeronautical Teiecommunicutions
4.1.3 System capabilities
Note.- A system providing aeronautical mobile-satellite
service (AMSS) comprises the AES, the satellite and the GES.
A Level I (2, 3 or 4) system consists of an AES with Level 1
(2, 3 or 4) capability with one or more satellites and one or
more GESs having the capabilities to operate compatibly with
all capabilities of the AES.
4.1.3.1 Scope. A level of system capability shall include
the performance of the AES, the satellite and the GES. All
AESs, as a minimum, shall have a Level 1 capability and shall
continuously monitor the P channel after log-on to the GES.
Each GES shall provide at all times when operating AMS(R)S,
a Level 1 capability as a minimum.
4.1.3.1.1 There shall be a P channel and an R channel
P,,, and K,, capability which perform system management
functions for each satellite service area.
4.1.3.1.2 For the case where there is one transmit
channel unit shared between the R and T channels, R channel
transmissions shall be delayed, whenever necessary, to avoid
interrupting a T channel transn~ission.
4.1.3.2 Level I . An AES with Level 1 capability shall
have the capabilities for:
a) receiving and processing data on one P channel at
channel rates of 0.6 and 1.2 kbitsls; and
b) processing and transmitting data on one R channel and
on one T channel at channel rates of 0.6 and 1.2
kbitsls.
Simultaneous transmission on the R channel and the T channel
shall not be required.
4.1.3.2.1 An AES with Level 1 capability shall receive
and process continuously the assigned P channel once logged
on with the GES to enable receipt of AES-addressed messages
and respond to GES commands.
4.1.3.2.2 Recommendation.- An AES wirh Level 1
capability should have the capabilities described in 4.1.3.2.for
the additional channel rate of 2.4 khitds.
Note.- An AES with b v e l I capobilily provides basic
packet mode data communications based on the open system
in,terconnection nzodel to support uviation safety communications.
An AES wirh hvel 1 capabili~ requires one receive
channel an.d one transmit channel.
4.1.3.3 Level 2. An AES with Level 2 capability shall
have the capabilities for:
a) receiving and processing data on one P channel at
channel rates of 0.6 and 10.5 kbitsls; and
b) processing and transmitting data on one R channel and
on one T channel at channel rates of 0.6 and 10.5
kbitsls.
Simultaneous transmission on the R channel and the T channel
shall not be required. Simultaneous reception on more than
one P channel shall not be required.
4.1.3.3.1 Recommendation.- An. AES with Level 2
capability should have the capabilities described in 4.1.3.3 a)
for the additional channel rate of 4.8 kbitsls.
4.1.3.4 Level 3. An AES with Level 3 capability shall
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