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selected from the red group.
Note 3.- Guidance material on the use of SELCAL systems
is contained in Attachment A to Part IT.
Note 4.- The tones Red l? Red Q, Red R, and Red S are
applicable afrer 1 September 1985, in nccordance with 3.2
below.
3.2 As from 1 September 19-95, aeronautical stations
which are required to communicate with SELCAL-equipped
aircraft shall have SELCAL encoders in accordance with the
red group in Lhc table of tone frequencies of 3.1 above. After
1 September 1985, SELCAL codes using the tones Red P, Red
Q, Red R, and.Red S may be assigned.
ANNEX 10 - VOLUME 111
Attachment A to Part I
GUIDANCE MATERIAL FOR AERONAUTICAL
MOBILE-SATELLITE SERVICE
1. INTRODUCTION
Packet data performance: Annex 10, Wume III, Part I,
Note.- The aem~uticalm obile-satellite service (AMSS) Chapter 4, 4.7.2
Stan&& and Recomrrsedd Pwtices (SARPs) refermd to
a* contained in Arueex 10, Volume Ill, Part I, Chapter 4,
1.1.6 CIRCUITM ODE VOICE
PERFORMANCE
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 aimaft earth
stations (AESs) that comprise the avionics and antenna
systems on-board the aircraft.
Note.- Several operators of AMS(R)S may upemte
independent but compatible satellite networks. The digemnt
operators should co-operate in order for AESs to move
seamlessly among the diflerent networks.
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
wed for various service levels, from the basic low data-rate
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 perjionnance of a 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 kvel of capability service will have
lower capital costs, it may have higher satellite user charges
for the same dataflow.
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 look at the over-all system performance. If
exact figures are required, the relevant paragraphs of
Annex 10, Volume m, Part I, Chapter 4 should be studied.
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:
-Use of abbreviated access request SU: 10 to 14
seconds (average)
- Use of general access request SU: less than 17
seconds (average)
to-aircraft: 9 to 11 seconds (average).
Note.- me call set-up time may be affected by the
perjiomnce of the associuted terrestrial network.
1.2 Levels of capability
1.2.1 The various levels of capability for the aircraft earth
station (AES) and ground earth station (GES) defined in
Annex 10, Volume ID, Part I, Chapter 4, 4.1.3 allow various
capabilities to exist which have different performance
characteristics. A Level 1 capability is the minimum capability
required for aeronautical mobilesatellite (mute) service
(AMS(R)S) providing basic packet data communications. A
Level 3 is required as a minimum when, in to packet
communications, circuit voice communi~ations 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 '1 capability provides for basic packet
data communications by requiring an AES to receive and
process a P channel signal operating at channel rates of 0.6 and
1.2 kbitsrs. It also requires the capability for an AES to
transmit on an R channel or on a T channel at these channel
System capabilities: Annex 10, Volume m, Part I,
Chapter 4, 4.1.3 * All tables are located at the end of this attachment.
ANNEX 10 - VOLUME 111 -YlVOO No. 75
Annex 10 - AeronauCical Telecommunications Volume IIZ
rates. Both R and T channel capabilities are required. The 1.2.7 Although a Level 4 AES is not required to provide
channel rate used will depend on the link quality determined simultaneous packet data communications with more than one
by the GES measurement of bit error rate (BER) or the GES, such a capability is not precluded.
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