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3.1.2.3.2.1.2 DF: Downlink format. This downlink format field (5 bits long except in format 24 whcre it is 2 bits
long) shall serve as the downlink format descriptor in all Mode S replies and shall be coded according to Figure 3-8.
3.1.2.3.2.1.3 AP: Address/parity. This 24-bit (33-56 or 89-112) field shall appear in all uplink and currently defined
downlink formats except the Mode S-only aka11 reply, DF - 11. The field shall contain parity overlaid on the aircraft
address according to 3.1.2.3.3.2.
3.1.2.3.2.1.4 PI: Parity/interrogator identifiel: This 24-bit (33-56) or (89-112) downlink field shall have parity
overlaid on the interrogator's identity code according to 3.1.2.3.3.2 and shall appear in the Mode S all-call reply, DF = 11
and in the extended squitter, DF = 17 or DF = 18. If the reply is made in response to a Mode A/C/S all-call, a Mode S-only
all-call with CL field (3.1.2.5.2.1.3) and IC field (3.1.2.5.2.1.2) equal to 0, or is an acquisition or an extended squitter
(3.1.2.8.5, 3.1.2.8.6 or 3.1.2.8.7), the I1 and the SI codes shall be 0.
3.1.2.3.2.2 Unassigned coding space. Unassigned coding space shall contain all ZEROS as transmitted by
interrogators and transponders.
Note.-- Certain coding space indicated as unassigned in this section is reserved for other applications such as ACAS,
data link, etc.
3.1.2.3.2.3 Zero and unassigned codes. A zero code assignment in all defined fields shall indicate that no action is
required by the field. In addition, codes not assigned within the ficlds shall indicate that no action is required.
Note.- The provisions of 3.1.2.3.2.2 and 3.1.2.3.2.3 ensure that fiture assignments of previously irnassigned coding
space will not result in ambiguity. That is, Mode S equipment in which the new coding has not been implemented will
clearly indicate that no information is being transmitted in newly assigned coding space.
3.1.2.3.3 ERROR PROTECTION
3.1.2.3.3.1 Technique. Parity check coding shall be used within Mode S interrogations and replies to provide
protection against the occurrence of errors.
3.1.2.3.3.1.1 Parity check sequence. A sequence of 24 parity chcck bits shall be generated by the rille described in
3.1.2.3.3.1.2 and shall be incorporated into the field folmed by the last 24 bits of all Mode S Lransmissions. The 24 parity
check bits shall be combined wit11 either the address coding or the interrogator identifier coding as described in 3.1.2.3.3.2.
The resulting combination then forms either the AP (addresstparity, 3.1.2.3.2.1.3) field or 1l1c PI (paritylinterrogator
identifier, 3.1.2.3.2.1.4) field.
Annex 10 - Aeronautical Telecommunications Volume lV
Format UF
No.
0 RL:1 ------- Shod air-air sunreillance (ACAS)
---------------------------------------
27 or 83
1 10000 1 RL:l I 4 AQ1 - - -I -8 - - - MU:56 AP:24 .... Long air-air surveillance (ACAS)
4
5
lo I------------------- z_or83- - ---------------- 1 AP:24 1
-------------
---------------------------------------
27 or 83 Fl
101 00 PC3 RR:5 D1:3 SD:16 MA26 AP:24 .... Cornrn-A, altitude request
10101 PC:3 RR:5 01:3 SD:16 MA:56 AP:24 .... Comm-A, idenllfy request
11
27 or 83
11 RC:2 NC:4 MC:80 AP:24 .... Comm-C (ELM)
001 00
00101
01011 PR'4 IC:4 CL:3 16 F] ------------- .... Mode S only all-call
NOTES.
1. 0XX:M den otes a field designated " X X which is assigned M 4. All [ormats are shown for completeness, although a number of bits. them are unused. Those formats for which no application is
,------, presently defined remain undefined in lenath. De~endina on
PC3
PC:3
denotes unassigned coding space with N available kture aisignmcnt they may be short (56 bits) or long (1 12-bits)
2- - - - - - - hits. These shall be coded as ZEROS for transmission. I I forn~ats. Specific fomsts associated with Mode S capabiliry
levels are described in later paragraphs.
3. For uplink [ormats (UF) 0 to 23 the format uumber corresponds
to the binary code in the first five bils of the inrerrogarion. 5- T~~~ PC, R ~ , and SD fields do not apply to a c o m n , - ~
Fomlm number 24 is defined as the format beginning with "1 1" broadcast interrogation.
in the first two blt posilions while the following three bits vary
with Ihe interrogation conlent.
Figure 3-7. Summary of Mode S interrogation or uplink formats
.... Surveillance, altibde request
.... Surveillance, identify request
RR:5 D1:3 SD:16
RR:5
AP:24
DI:3 SD:16 AP24
Chapter 3 Annex 10 - Aeronautical Telecommunicatwns
Format
No.
0 .... Short air-alr surveillance (ACAS)
.... Surveillance, alt~tude reply
.... Surveillance, identity reply
.... All-call repy
-I( ................................ - -.; - - 104
　
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