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1 0 0 0 0
0 1 1 0 0
0 0 1 I 1
1 1 1 I 1
1 0 1 0 0
1 0 0 0 0
1 1 0 1 1
0 0 0 1 1
0 1 0 0 0
Chapter 4 Annex I0 - Aemnautical Te~ecommunications
Coding
56
57
5 8
59
60
61
62
63
CHC HRC
47 48 49 50 51 52
1 I 1 0 0 0
1 I 1 0 0 1
1 1 1 0 1 0
1 1 1 0 I I
1 1 1 1 0 0
1 1 I 1 0 1
1 1 1 1 1 0
1 1 1 1 1 1
Note.- The rule used ta-generate the HSB subfield bit setting is a distance 3 Hamming code augmented with a parity
bit, producing the ability to detect up to three errors in the eleven transmitted bits.
4.3.8.4.2.3.2.8 MID (Aircrafl address). This 24-bit (65-88) subfield shall contain the 24-bit aircraft address of the
interrogating ACAS aircraft.
Note.- Structure of MU for a resolution message:
I u D s ~ = ~ ~ u D s ~-1=- o ~ I MTB / CVC I VRC I CHC I HRC I -3- I HSB I YSB I MID ~
4.3.8.4.2.3.3 Subjirld in MU for an ACAS broadcast. When UDSl = 3 and UDS2 = 2, the following subfield shall
be contained in MU:
4.3.8.4.2.3.3.1 MID (Aircraft address). This 24-bit (65-88) subiield shall contain the 24-bit aircraft address of the
interrogating ACAS aircraft.
Note.-- Structure of MU for an ACAS broadcast:
4.3.8.4.2.3.4 Subfields in MU for an RA broadcast. When UDSl = 3 and UDS2 = 1, the following subfields shall be
contained in MU:
UDSl = 3
4.3.8.4.2.3.4.1 ARA (active RAs). This 14-bit (41-54) subfield shall be coded as defined in 4.3.8.4.2.2.1.1.
4.3.8.4.2.3.4.2 RAC (RACs record). This 4-bit (55-58) subfield shall be coded as defined in 4.3.8.4.2.2.1.2.
UDS=~ 2
4.3.8.4.2.3.4.3 RAT (RA terminated indicator). This 1-bit (59) subfield shall be coded as defined in 4.3.8.4.2.2.1.3.
4.3.8.4.2.3.4.4 MTE (multiple threat encounter). This 1-bit (60) subfield shall be coded as defined in 4.3.8.4.2.2.1.4.
24 -----
4.3.8.4.2.3.4.5 AID (Mode A identity code). This 13-bit (63-75) sublield shall denote the Mode A identity code of
the reporting aircraft.
MID
Coding
Bit 63 64 65 66 67 68 69 70 71 72 73 74 75
Mode A code bit Cl A, C2 A2. C4 A4 0 B1 Dl B2 D2 B4 D4
4.3.8.4.2.3.4.6 CAC (Mode C altitude code). This 13-bit (76-88) subfield shall denote the Mode C altitude code of
the reporting aircraft.
Annex 10 - Aeronautical Telecommunications Volume ZV
Coding
Bit 76 77 78 79 80 81 82 R3 84 R5 86 87 88
Mode C code bit C1 A1 C2 A2 C4 -44 0 BI Dl B2 D2 B4 D4
Note.- Structure of MU for an RA broadcast:
4.3.8.4.2.4 MVfield. This 56-bit (33-88) field of long air-air surveillance replies (Figure 4-1) shall be used to transmit
air-air coordination reply messages.
4.3.8.4.2.4.1 VDS (V-definition subBeld). This 8-bit (33-40) subfield shall define the remainder of MV.
UDSI =3
Nnt~.- Fnr ronvenience in coding, VDS is expressed in mfo gro~tps of four bits each, VDSl and VDS2.
UDS2= 1 ARA
4.3.8.4.2.4.2 Subfields in MV for a coordination reply. When VDSl = 3 and VDS2 = 0, the following subfields shall
be contained in MV:
4.3.8.4.2.4.2.1 ARA (active RAs). This 14-bit (41-54) subfield shall be coded as defined in 4.3.8.4.2.2.1.1.
RAG
4.3.8.4.2.4.2.2 RAC (RACs record). This 4-bit (55-58) subfield shall be coded as defined in 4.3.8.4.2.2.1.2.
4.3.8.4.2.4.2.3 RAT (RA terminated indicator). This 1-bit (59) subfield shall be coded as defined in 4.3.8.4.2.2.1.3
4.3.8.4.2.4.2.4 MTE (multiple threat encounter). This 1-bit (60) subfield shall be coded as dcfincd in 4.3.8.4.2.2.1.4.
RAT
Note.- Structure of MV for a coordination reply:
MTE AID CAC
4.3.8.4.2.5 SL (sensitivity level report). This 3-bit (9-11) downlink field shall be included in both short and long
air-air reply formats (DF = 0 and 16). This field shall denote the sensitivity level at which ACAS is currently operating.
-2-
33 37 41 55 59 60 61
Coding
0
1
ACAS inoperative
ACAS is operating at sensitivity level 1
ACAS is operating at sensitivity level 2
ACAS is operating at sensitivity level 3
ACAS is operating at sensitivity level 4
ACAS is operating at sensitivity level 5
ACAS is operating at sensitivity level 6
ACAS is operating at sensitivity level 7
VDSl = 3
4.3.9 ACAS equipment characteristics
4.3.9.1 Interfaces. As a minimum, the following input data shall. be provided to the ACAS:
a) ~ircrnft~ ddressc ode;
b) air-air and ground-air Mode S transmissions received by the Mode S transponder for use by ACAS (4.3.6.3.2);
36 40 54 58 59 60 88
VDS2= 0 ARA RAC RAT MTE -28-
Chapter 4 Annex 10 - Aeronautical Telecommunications
c) own aircraft's maximum cruising true airspeed capability (Chapter 3, 3.1.2.8.2.2);
d) pressure altitude; and
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