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second satellite link may not be adequate for voice
communications, at least not in a normal conversation
mode. However, its effect on verbal exchanges typical of
ATC applications has not been studied.
c) States should have adequate institutional arrangements
with service providers based on ICAO guidelines for
AMSS.
No. 75
Annex 10 - Aeronautical Telecomunktbns
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Annex 10 - Aeronauk'cal TelecmmunicaHons
TABLES FOR ATTACHMENT A
'hble A-1. mid implementation v e m levels of capability
Packet data Circuit mode
Lwels of service service Number of AES antenna
capability (kbitsls) (kbiWs) channels gain Comments
Not available 1 transmit
1 receive
Not available
Voice
21.0
andlor 8,4
voice
21.0
and/or 8.4
1 transmit
1 receive
1 transmit
2 receive
2 or more
transmit
2 or more
receive
12 dB or 6 dB
(6 dB does not support
10.5 kbitsls data
channels)
12dB ot6dB
(6 dB does not support
21.0 kbits/s voice or
10.5 kbits/s data
channels)
12dBor6dB
(6 dB does not support
21.0 kbits/s voice or
10.5 kbits/s data
channels)
Higher speed for packet
data
Provides digitized voice
and packet data, but not
simultaneously
Simultanwus two-way
packet and voice. Needs
linear amplifier and
power conrrol for each
camier
NOTES:
1. Circuit mode data services may be supported by some implementation, but these are not defined in the AMSS SARPs.
2. The 4.8 kbits/s channel applies only to the P channel.
'hble A-2. Worst ease data performance versus channel rate
Residual error rate:
from-aircraft direction: lo4 per SNSDU (maximum)
to-aircraft direction: 1 6pe r SNSDU (maximum)
Minimum
channel rate
in use by AES
(bitts)
NOTES:
1. In any particular AES, lower priority from aircraft traff~cm ay be subject to additional delay, depending on the amount and rate of
from-aircraft traffic loading.
2. The values of the transfer delays are based on packet sizes of 128 octets.
Maximum connection
establishment delay
(95th percentile)
(seconds)
Transit delay (average) (seconds)
Data transfer delay (95th percentile)
(seconds)
To-aircraft
Highest Lowest
priority priority
To-aircraft
Highest Lowest
priority priority
From-aircraft
Highest
priority
From-aircraft
Highest
priority
Annex 10 - Aerunuutical Tekcommunicadons
Table A-3. Q-precedence structure for AMSS transmissions
AMSS
Q-number Function
15 DistreWurgency voice; signalling
14 Distresshrgency data messages
13 Resewed far signalling
12 Flight safety voice; signalling
1 1 . Flight safety data messages; ccmmunications related to
directian finding
10 Meteorological and flight regularity voice; signalling
9 Remed for signalling
8 Meteorological data messages
7 Flight regularity data messages
6 Aeronautical Information Service Messages
5 Aeronautical administrative data messages, netw&systems
administrative data messages
4 Routine cockpit and cabin voice; signalling
3-0 Variws AAC and APC categories; other
Thble A4. Frequency ermr budget for receiving the P channel
. . . ..
Specification Standard deviation
GES transmit reference emr *100 Hz 57.7 Hz
AFC pilot transmit emr tlOO Hz
GES AFC ermr 2100 Hz
AES receive reference emr 1155 Hz 89.5 Hz
Oscillator related errors at AES - standard deviation
- 99 per cent contour
NOTES:
711 1F96
No. 71
1. It is assumed that oscillator specifications define a uniform error distribution.
2. The contribution of a number of oscillators to the overall emor is estimated using a root-sumsquare
calculation.
A#aEhmenl A b Part I Annex 10 - Aeronautical Telecommunications
Table A-8. Typical W channel carrier to noise densities required
Elevation angle to the satellite (degrees)
Objective FEC decoder output BER
AES minimum antenna gain (dB)
Carrier/multipath ratio (dB)
Multipath fading bandwidth (Hz)
FEC coding rate
Modulation method
Theoretical required EJNo (dB)
Modern implementation loss (dB)
Imperfect interleaving loss ( d ~ ) '
Adjacent channel interference loss (dB)'
Modem E n o (dB) required
From-aircraft link WT channels
(law rate data)
REQUIRED UNo (dB&)
0.6 kbits/s
1.2 kbits/s
2.4 kbitds
4.8 kbits/s
10.5 kbits/s
From-aircraft link WT channel
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