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nominally 8 s intervals for the period that the RA is indicated. The RA broadcast shall include the MU field as specified
in 4.3.8.4.2.3.4. The RA broadcast shall describe the most recent R.4 that existed during the preceding 8 s period.
Installations using directional antennas shall operate such that complete circular coverage is provided nominally every 8
s and the same RA sense and strength is broadcast in each direction.
4.3.7.3.3 Data link capability report. These protocols are described in 4.3.11.4.2.
4.3.7.3.4 ACAS sensitivity level confrol. ACAS shall act upon an SLC command if and only if TMS (Chapter 3,
3.1.2.6.1.4.1) has the value 0 and DI is either 1 or 7 in the same interrogation.
4.3.8 Signal formats
4.3.8.1 The RF characteristics of all ACAS signals shall conform to the Standards of Chapter 3, 3.1.1.1 through
3.1.1.6, 3.1.2.1 through 3.1.2.3, 3.1.2.5 and 3.1.2.8.
4.3.8.2 RELATIONSHIBPE TWEEN ACAS AND MODES SIGNAL FORMATS
Note.- ACAS uses Mode S tmnsmissions for surveillance and communications. ACAS air-air communicationfunctions
permit RA decisions to be coordinated with ACAS-equipped threats. ACAS air-ground communicutionfunctiom permif the
reporting of RAs to ground starions and the uplinking of commands to ACAS-equipped aircrap to control parameters of
the collision avoidance algorithms.
4.3.8.3 Signal format conventions. The data encoding of all ACAS signals shall conform to the Standards of Chapter
3, 3.1.2.3.
Note.- In air-air transmissions used by ACAS, interrogations transmitted at 1 030 MHz are designated as uplink
transmissions and contain uplink format (UF) codes. Replies received at 1 090 MHz are designated as downlink
transm~issions and contain downlink format (DF) codes.
4.3.8.4 FIELD DESCRIPTION
Note 1.- The air-air surveillance and communication formats which are used by ACAS bur not fully described in
Chapter 3, 3.1.2 are given in Figure 4-1.
Uplink: ------------ -------------
U F = O F l 3 3 4 18 ------------- ------------ -------------
Downlink:
Figure 4-1. Surveillance and communication formats used by ACAS
4-15 28/11/02
DF = 16
- - - - - - -
10000 VS: 1 1 2 (-RI:(---;1 --- AC:13 MV:56 AP:24
- - - - - - - - - - - - - - - - - - - - -
Annex 10 - Aeronautical Telecommunications Volume IV
Note 2.- This section defines the Mode Sfields (and their subfields) that are processed by ACAS to accomplish ACAS
functions. Some of the ACASfields (those also used for other SSR Mode Sfunctions) are described with unassigned ACAS
codes in Chapter 3, 3.1.2.6. Such codes are assigned in 4.3.8.4.1. Fields and subfields used only by ACAS equipment are
assigned in 4.3.8.4.2.
Note 3.- The bit numbering convention used in 4.3.8.4 reflects the bit numbering within the entire uplink or downlink
format rather than the bits within individual fields or subfields.
4.3.8.4.1 FIELDS AND SUBFIELDS INTRODUCED IN CHAPTER 3, 3.1.2
Note.- Codes for mission jields and subfields that are designated "reserved for ACAS" in Chapter 3, 3.1.2, are
specified in this sectiorr.
4.3.8.4.1.1 DR (downlink request). The significance of the coding of the downlink request field shall be as follows:
Coding
0-1 See Chapter 3, 3.1.2.6.5.2
2 ACAS message available
3 Comm-B message available and ACAS message available
4-5 See Chapter 3, 3.1.2.6.5.2
6 Comm-B broadcast message 1 available and ACAS message available
7 Comm-B broadcast message 2 available and ACAS message available
8-31 See Chapter 3, 3.1.2.6.5.2
4.3.8.4.1.2 RI (air-air reply infonnation). The significance of the coding in the RI field shall be as follows:
Coding
0 No operating ACAS
1 Not assigned
2 ACAS with resolution capability inhibited
3 ACAS with vertical-only rcsolution capability
4 ACAS with vertical and horizontal resolution capability
5-7 Not assigned
8-15 See Chapter 3, 3.1.2.8.2.2
Bit 14 of the reply format containing this field shall replicate the AQ bit of the interrogation. The lU field shall report 'ho
operating ACAS" (RI = 0) if the ACAS unit has failed or is irl slarldby. Thr: RI field shall report "ACAS wit11 ~ewlutio~i
capability inhibited" (RI = 2) if sensitivity level is 2 or TA only mode has been selected.
Note.- Codes 0-7 in the RI field indicate that the reply is a tracking reply and also give the ACAS capability of the
interrogated aircraft. Codes 8-15 indicate that the reply is an acquisition reply and also give the maximum true airspeed
capability of the interrogated aircraft.
4.3.8.4.1.3 RR (reply request). The significance of the coding in the reply request field shall be as follows:
Coding
0-18 See Chapter 3, 3.1.2.6.1.2
19 Transmit a resolution advisory report
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