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------ IIIII ................................ I
....................................
p G q - - ------------ ------------2-7- o-r -83- ------------------ j-Tr
I 11 I 1 KE: 1 ND:4 I MD:80 I AP:24 I
.... Long air-air surveillance (ACAS)
... Extended squitterlnon transponder
... Military extended squitter
.... Comm-8, altitude reply
.... Comm-6, identify reply
.... Comm-D (ELM)
NOTES;
denotes a field designated "XX" which is assigned M reply. Format number 24 is defined as the format beginning
bits. with "1 1" in the first two bit ~ositionsw hile the followinp three
I
denotes a 24-bit field reserved for parity information
bits may vary with the reply content. - ------ 4. All formats are shown for completeness, although a number of
denotes unassigned coding space with N ava~lable thcm are unused. Those formats for which no application is
2. l--yL1 bits. These shall be coded as ZEROS for transmission. presently defined remain undefined in length. Depending on
Cuture aisignrnent they inay be short (56 bits) or long (1 12 bits)
3. For downlink formats (DF) 0 to 23 the format number formats. Specific formats associated with Mode S capability
corresponds lo the binary code in the first five bits of the levels are described in later paragraphs
Figure 3-8. Summary of Mode S reply or downlink formats
Annex 10 - Aeronautical T~l~communications
Table 3-3. Field definitions
Volume IV
Field
Designator Function
AA Address announced
AC Altitude code
AF Application field
AP Addresslparity
AQ Acquisition
C A Capability
CC Cross-link capability
CF Control field
CL Code label
DF Downlink format
DI Designator identification
DR Downlink request
DS Data selector
FS Flight status
IC Interrogator code
ID Identity
KE Control, ELM
MA Message, Comm-A
MB Message, Comm-B
MC Message, Comm-C
MD Message, Comm-D
ME Message, extended squitter
MU Message, ACAS
MV Message, ACAS
NC Number of C-segment
ND Number of D-segment
PC Protocol
PI Paritytintemogator identifier
PR Probability of reply
RC Reply control
RI Reply information
RL Reply length
RR Reply request
SD Special designator
UF Uplink format
UM Utility message
VS Vertical status
Reference
3.1.2.5.2.2.2
3.1.2.6.5.4
3.1.2.8.8.2
3.1.2.3.2.1.3
3.1.2.8.1.1
3.1.2.5.2.2.1
3.1.2.8.2.3
3.1.2.8.7.2
3.1.2.5.2.1.3
3.1.2.3.2.1.2
3.1.2.6.1.3
3.1.2.6.5.2
3.1.2.8.1.3
3.1.2.6.5.1
3.1.2.5.2.1.2
3.1.2.6.7.1
3.1.2.7.3.1
3.1.2.6.2.1
3.1.2.6.6.1
3.1.2.7.1.3
3.1.2.7.3.3
3.1.2.8.6.2
4.3.8.4.2.3
3.1.2.8.3.1,
4.3.8.4.2.4
3.1.2.7.1.2
3.1.2.7.3.2
3.1.2.6.1.1
3.1.2.3.2.1.4
3.1.2.5.2.1.1
3.1.2.7.1.1
3.1.2.8.2.2
3.1.2.8.1.2
3.1.2.6.1.2
3.1.2.6.1.4
3.1.2.3.2.1.1
3.1.2.6.5.3
3.1.2.8.2.1
UF
All
0
11
4, 5,
20, 21
0
11
20, 21
24
16
24
4, 5,
20, 21
11
24
0
4, 5,
20, 21
4, 5,
20, 21
All
Format
DF
1 1 1 18
4, 20
19
0, 4, 5, 16,
20, 21, 24
11, 17
0
18
All
4, 5,
20, 21
4,5.
20, 21
5, 21
24
20, 21
24
17, 18
16
24
1 1 18
0
4, 5,
20, 21
0
Chapler 3 Anltex 10 - Aeronautical Xe2ecommunicatwrrs
Table 3-4. Subfield definitions
3.1.2.3.3.1.2 Purily check sequence generation. The sequcncc of 24 parity bits @,, p2, ..., pZ4) shall be generated from
the sequence of information bits (nz,, mz, ..., mk) where k is 32 or 88 for short or long transmissions respectively. This shall
be donc by means of a code generated by the polynomial:
Scrbjield
Designutor Function
ACS Altitude code subfield
AIS Aircraft identification subfield
ATS Altitude type subfield
BDS 1 Comm-B data selector subfield 1
BDS 2 Comm-B data selector subfield 2
IDS Identifier designator subfield
IIS Interrogator identifier subfield
LOS Lockout subfield
LSS Lockout surveillance subfield
MBS Multisite Comm-B subfield
MES Multisite ELM subfield
RCS Rate control subfield
RRS Reply request subfield
RSS Reservation status sublicld
S AS Surface antenna subfield
SCS Squitter capability subfield
SIC Surveillance identifier capability
SIS Surveillance identifier subfield
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