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Universal time
Voice channel characteristics
ANNEX 10 - VOLUME 111
Annex 10 - Aeronautical Telecommunications Volume 111
SIGNAL UNIT FIELD CODING AND DESIGNATIONS
Note.- Codes are listed as their decimal values unless 6. Burst interval (4 bits)
indicated as hexadecimal by the letters HEX. Codes marked
RESERVED are reserved for use in particular AMSS system In a multi-burst reservation, this field shall indicate that there
implementations. is one burst reservation per 2B1 frames, where BI=burst
interval.
1. ACIUNAK (1 bit)
Code Function
0 NAK, rewansmit indicated message
1 ACK, do nor retransmit indicated message
2. Acknowledge control (4 bits)
Code Function
0 This ACK includes all retransmission requests
1-13 Number of retransmission request ACK messages
remaining (applicable for PACK and TACK SUs
only)
14 No errors in entire message
15 Retransmit entire message (applicable for PACK and
TACK SUs only)
3. AES ID (3 octets)
7. Burst length (5 bits)
This field shall indicate the length of the burst in terms of the
number of signal units.
8. Calledlcalling terminal
(8 bits)
Binary coded decimal (BCD) encoding, with the most significant
digits appearing in least significant half octet, and vice
versa.
9. Cause class (3 bits)
The assignment and interpretation of this field shall be dicrated
by the value assigned to the S (coding standard) field
(Item 5 1). Cause class shall be used in association with cause
value (Item 10) to identify the actual cause meaning.
This field shall be the 24-bit aircraft address of the AES (see CCITT 4.931 standard coding:
Chapter 9).
Code Function
4. Application reference
number (4 bits)
This field shall contain the direct binary number of the reference
number assigned by thc circuit-mode services to the
circuit-mode call.
The application reference number shall uniquely identify a call
between an AES/GES pair. Application reference numbers
shall be assigned cyclically by the AES on air-to-ground calls
from the rang 0-7 and by the GES on ground-to-air calls to
a given AES from the range 8-15.
5. Beam ID (6 bits)
Code Function
0 Global beam
1-63 Spot beams
Normal event
Normal event
Resource unavailable
Service or option not available
Service or option not implemented
Invalid message (e.g. parameter out of range)
Protocol error (e.g. unknown message)
Interworking
Satellite network specific coding:
Code Function
PSTN/ISDN call progress events
Call pre-emption
Resource unavailable
Invalid parameter
Out of service
Network failure
S ervicetoption not supported
Normal event
7/11/96
No. 71
Part I Annex 10 - Aeronautical Telecommun~ations
Figure A7-2. Error detection/correction process
CHAPTER 5. SSR MODE S AIR-GROUND DATA LINK
Note.- The SSR Mode S air-ground data link is also referred Comm-D. A 112-bit reply containing the 80-bit MD message
to as the Mode S subnetwork in the context of the aeronautical field. This field is used by the downlink ELM protocol.
telecommunication network (ATN).
Connection. A logical association between peer-level entities
in a communication system.
5.1 DEFINITIONS RELATJNG TO THE
MODE S SUBNETWORK
Air-inifiafed protocol. A procedure initiated by a Mode S
aircraft installation for delivering a standard length or
extended lcngth downlink message to the ground.
Airborne data link processor (ADLP). An aircraft-resident
processor that is specific to a particular air-ground data
link (e.g. Mode S), and which provides channel management,
and segmelits and/or reassembles messages for
transfer. It is connected on one side (by means of its DCE)
to aircraft elements common to all data link systems, and
on the other side to the air-ground link itself.
Data link capability report. Information in a Comm-B reply
identifying the complete Mode S communications capabilities
of the aircraft installation.
Extended length message (ELM). A series of Comm-C
interrogations (uplink ELM) transmitted without the
requirement for intervening replies. or a series of Comm-D
replies (downlink ELM) transmitted without intervening
interrogations.
Uplink ELM (UELM). A term referring to extended length
uplink communicatior~ by means of 112-bit Mode S
Comm-C interrogations, each containing the 80-bit Comm-
C message field (MC).
~ jdflk~ c.rcu~~-termi~n(l~ng ~epbmpen{t ~ c E ) .A " Downlink ELM (DELM). A term referring to extended length
aircraft specific data circuit-terminating equipment that is downlink communication by means of 112-bit Mode S
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