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 -------------------------------------------------------------------------------| DESIGNATOR | FIELD | INDICATION | -------------------------------------------------------------------------------| AA | address | contains the A/C mode S address | | | announced | | | | | | | AC | altitude | information containing the A/C altitude | | | code | | | | | | | AP | address | 24-bit address and parity overlaid | | | parity | | | | | | | CA | transponder | reports transponder capability | | | capability | | | | | | | DR | downlink | requests extraction of downlink messages from | | | request | the transponder by the interrogator | | | | | | FS | flight | flight status | | | status | | | | | | | ID | identification | contains the Mode A identification code | | | | | | MB | message | 56-bit MB field contains the message | | | Comm B | transmitted to the interrogator | | | | | | MD | message | 80-bit MD field contains one segment of a | | | Comm D | sequence of segments in the ELM Mode | -------------------------------------------------------------------------------
4 Data transmitted for elementary surveillance
_ The specific data related to the elementary surveillance are the following:
 -24 bits A/C adress (coded in AA field of DF11)
 -flight number (MB field of DF20 or DF21 filled in with Binary Data Stores (BDS) 2.0
 -transponder capability report (coded in CA field of DF11)
 -altitude/ground reporting (coded in AC field of DF4 or DF20)
 -flight status (coded in FS field of DF4)
 -RA report (MB field of DF20 or DF21 filled in with BDS 3.0)
 -Surveillance Identifier (SI) (coded in PI field of DF11)
R 1EFF : 106-149, 221-299, 301-399, 401-499, 1 34-52-00Page 59 1 1 Aug 01/05 1 1 1CES 1 5 Data transmitted for enhanced surveillance (if the optional

_ wiring provisions for enhanced surveillance/extended squitters are valitated) The specific parameters related to the enhanced surveillance are:
 -selected altitude
 -barometric pressure setting
 -roll angle
 -track angle rate
 -true track angle
 -ground speed
 -true air speed
 -magnetic heading
 -indicated airspeed
 -mach
 -barometric altitude rate
 -inertial vertical velocity Data is transmitted in MB field of BDS 4.0, 5.0 or 6.0 in DF20 or DF21, upon request from ground station.
 6 Data transmitted in extended squitters (if the optional wiring
_ provisions for enhanced surveillance/extended squitters are validated) The specific parameters related to the extended squitters are:
 -altitude

 -longitude

 -latitude

 -movement

 -ground track

 -flight number

 -E/W velocity

 -N/S velocity

 -vertical rate
 These data are transmitted in ME field of BDS 0.5, 0.6, 0.7,

 0.8 or 0.9 in DF17.
 Extended squitters are automatically broadcast at different
 rates as shown in the following table.
 (Ref. Fig. 009)

 (4)
 Not Applicable

 (5)
 Not Applicable

R 1EFF : 106-149, 221-299, 301-399, 401-499, 1 34-52-00Page 60 1 1 Aug 01/05 1 1 1CES 1

 ATC - Extended Squitters DF17 Format
 Figure 009

R 1EFF : 106-149, 221-299, 301-399, 401-499, 1 34-52-00Page 61 1 1 Aug 01/05 1 1 1CES 1

R  **ON A/C 201-220, 
R  (3) Principle of operation 
R  (Ref. Fig. 003) 
R  Each ground interrogator transmits its interrogations at the 
R  frequency of 1030 MHz in the form of a series of two pulses. 
R  Depending on the pulse intervals and numbers, they define four 
R  different interrogation modes: 
R  - Mode A interrogations 
R  - Mode C interrogations 
R  - Mode S all call interrogations 
R  - Mode S interrogations. 
R  After receiving these pulses, the transponder identifies and 
R  decodes the interrogations. Depending on the detected interrogation 
R  mode, the transponder transmits the identification of the aircraft 
R  or its barometric altitude. The transponder is provided with the 
R  Mode S Data Link capability. The transmission of the replies to the 
R  ground takes place on a carrier frequency of 1090 MHz. 
R  (a) Interrogations 
R  (Ref. Fig. 002) 
R  Four classes of interrogations are transmitted by the ground 
R  interrogator, they are: 
R  1 Mode A or C interrogations_ 
R  A mode A or C interrogation consists of two pulses labelled P1 
　
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