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Aeronautical Telecommunication
Network Panel (ATNP);
seventh meeting oC the
Aeronautical Mobile
Communications Panel
(AMCP); thc Secretariat
assisted by the ATS Voice
Switchtng and S~gnallingS tudy
Group (AVSSSG)
Adr~pted
Eflective
Subject(s) Applicable
Introduction of new Volume 111 and SARPs related to the Aeronautical 20 March 1995
Mobile-Satcllitc Service (AMSS) 24 July 1995
9 November 1995
Addition of specifications for the Mode S subnetwork of ATN; 12 March 1996
addition of material relating to the introduction of 8.33 kHz channel 15 July 1996
spacing; changes to material related to the protection of air-ground 7 November 1996
communications in the VHF band; addition of tcchnical specifications
relating to the RF characteristics for the VHF digital link (VDL).
Introduction of SARPs and guidance material for VHF digital link 12 March 1997
(VDL); definition for VDL and deletion of obsolete material on 21 July 1997
airlground data interchangc. 6 November 1997
Introduction of material relating to the ATN; changes to specifications 19 March 1998
of the Mode S subnetwork. 20 July 1998
5 Novcmber 1998
Introduction or: a) specifications for HP data link; and b) changes to 18 March 1999
the specifications for emergency locator transmitters. 19 July 1999
4 November 1999
Changes to the AMSS SARPs introducing a new antenna type, a new 13 March 2000
voice channel type and enhanced provisions for in~eroperability 17 July 2000
among AMSS systems; changes to the VDL SARPs to reduce 2 Noveml)er 2000
potential interference to current VHF voicc communication systems
caused by VDL transmitters; changes to the VHF voice communication
SARPs to enhance immunity to interference from VDL
transmitters on board the same aircraft.
Aeronautical telecommunication network (ATN) system management, 12 March 2001
security and dircctory services; removal of detailed material relating 16 July 2001
to CIDIN; integrated voice and data link system (VDL Mode 3); data 1 November 2001
link satisfying surveillance applications (VDL Mode 4); deletion of all
the provisions for VDL Mode 1; removal of thc detailed technical
specifications for VDL Mode 2; aeronautical speech circuits; update
of rererences to the ITU Radio Regulations.
1/11IU1
No. 76
Annex 10 - Aeronautical Telecommunications Volume 111
Adopted
Effective
Arnerzdment Source(s) Subject(s) Applicable
77 Secondary Surveillance Radar Mode S subnetwork (Part I), aircraft addressing system (Part I); and 27 February 2002
Improvements and Collision incorporation of VDL Modes 3 and 4 into ATN SARPs. 15 July 2002
Avoidance Systems Panel 28 November 2002
(SICASP)
28/11/02
No. 77
CHAPTER 5. SSR MODE S AIR-GROUND DATA LINK
Note.- The SSR Mode S air-ground data link is also referred capability (CA) field of an all-call reply or squitter
to as the Mode S subnetwork in the context ofthe aeronauticul transmission (see "data link capability report").
felecommunicatiorz network (ATN).
Close-out. A command from a Mode S interrogator that
terminates a Mode S link layer communication transaction.
5.1 DEFINITIONS RELATING TO THE Cluster of interrogators. Two or more interrogators with the
MODE S SUBNETWORK same interrogator identifier (11) code, operating cooperatively
to ensure that there is no interference to the required
Air-initiated protocol. A procedure initiated by a Mode S surveillance and data link performance of each of the
aircraft installation for delivering a standard length or interrogators, in areas of common coverage.
extended length downlink message to the ground.
Comm-A. A 112-bit interrogation containing the 56-bit MA
Aircraft. The term aircraft may be used to refer to Mode S message field. This field is used by the uplink standard
emitters (e.g. aircrafthehicles), where appropriate. length message (SLM) and broadcast protocols.
Aircraft data circuit-terminating equipment (ADCE). An Comm-B. A 112-bit reply containing the 56-bit MB message
aircraft specific data circuit-terminating equipment that is
field. This field is used by the downlink SLM, groundassociated
with an airborne data link processor (ADLP). It initiated and broadcast protocols.
operates a protocol unique to Mode 'S data link for data
transfer between air and ground. Comm-C. A 112-bit interrogation containing the 80-bit MC
message field. This field is used by the uplink cxtended
Aircraft data link processor (ADLP). An aircraft-resident
lengthmessage (ELM) protocol.
processor that is specific to a particular air-ground data link Comm-D. A 112-bit reply containing the 80-bit MD message
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