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CHAPTER I. DEFINITIONS
[to be developed]
ANNEX 10 - VOLUME 111
CHAPTER 2. AERONAUTICAL MOBILE SERVICE
[to be developed]
ANNEX 10 - VOLUME 111
ANNEX 10 - VOLUME 111
CHAPTER 3. SELCAL
[to be developed]
CHAPTER 4. AERONAUTICAL SPEECH CIRCUITS
[to be developed]
ANNEX 10 - VOLUME 111
CHAPTER 5. EMERGENCY LOCATION TRANSMITTER
[to be developed]
ANNEX 10 - VOLUME 111
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Attachment A to Part I
GUIDANCE MATERIAL FOR AERONAUTICAL
MOBILE-SATELLITE SERVICE
1. INTRODUCTION
Note.- The mmnuutical mobile-satellite service (AMSS)
Standards and Recommended Practices (SARPs) n$erred to
are contained in A w x 10, Volume 111, Parr I, Chapter 4.
1.1 Overview
1.1.1 The major elements of the aeronautical mobilesatellite
service (AMSS) are the space segment (the satellites
and their controlling earth stations); the ground earth stations
(GESs) that provide interfaces between the satellite and fixed
terrestrial voice and data networks; and the aircraft earth
stations (AESs) that comprise the avionics and antenna
systems on-board the aircraft.
1.1.2 The system architecture is capable of meeting a
range of communication requirements which may include
ATS, AOC, AAC and APC. The same system architecture is
used for various service levels, from the basic low data--
service to a multi-channel high data-rate service.
1.1.3 The level of capability of an AMSS system can be
chosen to suit the performance required by the application.
Note 1.- The pdorrnance of n service will be set by the
lowest level of capability available in the chain of GES, space
segment and AES.
Note 2.- While a low level ofcapubiliry service will have
lower capital cosfs, it may have higher satellite user charges
for the same ddta &w.
1.1.4 The capabilities are summarized in Table A-1 * of
this guidance material.
1.1.5 The examples of performance given in this section
are to give a quick lmk at the over-all system performance. If
exact figures are required, the relevant paragraphs of Annex
10, Volume 111, Part I, Chapter 4 should be studied.
System capabilities: Annex 10, Volume III, Part I,
Chapter 4, 4.1.3
Packet data performance: Annex 10, Volume III,
Part I, Chapter 4, 4.7.2
1.1.6 CIRCUIT MODE VOICE
PERPORMANCE
Assuming that the AES is logged on to a GES, the AMSS will
typically take the following times to set up a call:
from-aircraft: 10 to 14 seconds (average)
to-aircmft: 9 to 11 seconds (average).
Note.- The cull set-up rim may be &c@d by the
perfornuutce of the associated terrestrial network.
1.2 Lwels of capability
1.2.1 The various levels of capability for the aircraft
earth station (AES) and ground earth station (GES) defined in
Amex 10, Volume III, Part I, Chapter 4, 4.1.3 allow various
capabilities to exist which have different performance characteristics.
A kvel 1 capability is the minimum capability
requid for aeronautical mobile-satellite (mute) service
(AMS(R)S) providing basic packet data communications. A
Level 3 is required as a minimum when, in addition to packet
communications, circuit voice communications are required.
All levels of capability require that the AES be under positive
control either by receiving a P channel signal or through the
C channel sub-band. Only one of the channel rates indicated
below is required to operate at any given time.
1.2.2 The Level I capability provides for basic packet
data communications by requiring an in to receive and
process a P channel signal operating at channei rates of 0.6
and 1.2 kbits/s. It also requires the capability for an AES to
transmit on an R channel or on a T channel at these channel
* Alt tables are tocated at the end of this attachment.
ANNEX 10 - VOLUME II I 231
Annex 10 - Aeronautical Telecommunications Volume ZZZ
rates. Both R and T channel capabilities are required. The
channel rate used will depend on the link quality determined
by the GES measurement of bit error rate (BER) or the estimate
of that BER. Major factors that determine the channel
rate are the antenna gain of the satellite and AES, and the RF
power output of the satellite and AES. Level 1 requires one
transmit channel (for R or T channel) and one receive channel
(for P channel).
1.2.3 The Level 2 capability provides for channel rates
of 0.6 and 10.5 kbits/s for the P channel; and 0.6 and 10.5
kbitsls far the R channel and the T channel. The major factor
determining when to use these channel rates is the AES
antenna gain, which must be at least 12 dBic when working
　
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