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rcspcct lo geographical distribution of user earth stations.
Subsequent signal unit (SSU). In a series of SUs, the signal
unit(s) following the initial signal unit.
Superframe. A recurring, time-structured set of data transmission
frames, which also includes a superframe marker
(see also the definition of "frame").
4.1.1.2 DESCRIPTIOONF
CHANNEL TYPES
4.1.1.2.1 P channel. Packet mode time division
multiplex (TDM) channel transmitted continuously from the
aeronautical ground earth station (GES) in the to-aircraft
direction ro carry signalling and user data. A P channel being
used for system management functions is designated P,,,
while a P channel being used for other functions is designated
by P,. The functional designations P,,, and P, do not necessarily
apply to separate physical channels.
4.1.1.2.2 R channel. Random access (slotted Aloha)
channel, used in the from-aircraft direction to carry signalling
and user data. An R channel being used for system management
functions is designated R,,,, while an R channel being
used for other functions is designated Rd. The functional
designations R,,, and R, do not necessarily apply to separale
physical channtls.
4.1.1.2.3 T channel. Reservation time division multiple
access (TDMA) channel, used in the from-aircrafi direction
only. Thc receiving GES reserves time slots for transmissions
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 .'I .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-satelli te 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.
4.2.2.2 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 4.1.2.2 shall provide
at least two years' notice of mandatory carriage of airborne
systems.
4.1.2.4 Recommendation.- Civil aviation authorities
should co-ordinate, with national authorities and service
provirkrs, those implementatiorl aspects of AMSS which will
permit its world-wide interoperability and optimum use, as
appropriate.
Note.- P~vvisionso n the allocation an,d assignment of 24-
bit nircraft addresses for use by the AMSS are contained in
Chapter 9.
7/11/96
No. 71
Appendix 3 to Chapter 4
SIGNAL UNIT FIELD CODING AND DESIGNATION
ACWNAK
Acknowledge control
AES ID
Application reference number
Beam ID
Burst interval
Burst length
Called/calling terminal
Cause class
Cause value
Channel bit rate
Channel frequency
Channel type
Circuit data rate
Circuit data requirement
Class of AES
CCIIT CRC
Data bit rate capability
Delay to RES
Digit
DLS/RLS
Duration
EIRP adjustment
Existence
GES ID
GES beam support table
Idle pattern
Initial E m
I/R (initidrenewal)
Length
Global beam series (GBS)
Location
LSU number
LOV
Message length
Message type
Network ID
NOT (number of transmitters)
Number of bursts reserved
Number of C channels
Number of frequencies
Number of octets in the last SSU
Number of SSUs (in Ack)
P/R MSG
PIS (primary/secondary)
Q number (precedence)
Reason
Received bit error rate
Reference number
Report type
Reserved
Revision number
RFC flag
S (coding standard)
Satellite flag
Satellite ID
Satellite inclination
Satellite longitude
Satellite right ascension
SC
Sequence indicator
Sequence number
Sequence number (off-set value)
Service direction
Service identity
Source
Spare
Spot beam series (SPS)
Starting frame number
Starting slot number
su type
TDMA MSG
Tx channel number
　
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