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MODE 1 CODE
-
1
2
3
4
5
6
7
-8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
-24
25
26
27
28
29
30
31
-32
33
34
35
36
37
38
39
-40
41
42
43
44
45
46
47
-48
49
50
51
52
53
54
55
56
MODE 2 CODE
STATUS
Character Field (see 1)
C1
A1
C2
A2
C4
A4
X
B1
Dl
82
D2
84
D4
STATUS
C1
A1
C2
A2
C4
A4
X
61
D l
B2
02
84
D4
RESERVED
PURPOSE: To provide data in support of military applications.
1) The character field shall be used to indicate whether 2
characters or 4 characters are used in the Mode 1 code.
The logic shall be as follows:
0 - 2 octal codes
(A1-A4 and 81-84)
1 = 4 octal codes
( ~ 1 - ~841,-6 4, C1-C4 and Dl-D4)
2) The status fields shall be used to indicate whether the data
are available or unavailable. The logic shall be as follows:
0 = Unavailable
1 = Available
Part I Annex 10 - Aeronautical Xe~ecolrimurrlcalions
Table 2-242. BBS code F,2 -- Military applications
MI3 FIELD
MODE 1 CODE
11 1 1 1 PURPOSE. This register is used for military applications
involving DF=19. Its purpose is to provide data in support of
military applications.
TYPE CODE = 0
'TYPE CODE' shall be encoded as follows:
0 = Mode code information
1 - 31 = Unassigned
1) The character field shall be used to indicate whether 2
characters or 4 characters are used in the Mode 1 code
The logic shall be as follows:
0 = 2 octal codes
(Al-A4 and 81-84)
1 = 4 octal codes
(Al-A4, 81-84, C1-C4, and Dl-D4)
2) The status fields shall be used to indicate whether the data
are available or unavailable. The logic shall be as follows:
0 = Unavailable
1 = Available
MODE 2 CODE
MODE A CODE
28/1- 1/02
No. 77
Annex 10 - AeronauticaI TeIecornrnunications
3. FORMATS FOR MODE S SPECIFIC PROTOCOLS (MSP)
Volume III
3.1 MSP CHANNEL NUMBER ALLOCATIONS
The details of protocols and data transfers shall he as specified in t l f~ollo wing paragraphs.
Note.- Some MSP channel nwnhers have been assigned (see Chapter 5, Table 5-25).
3.2 UPLINK MSP CHANNELS
The following sections are numbered 3.2.X, where 'X is the decimal, equivalent of h e uplink MSP channel number. This shall be
done to allow definitions of the hitherto undefined formats to be inserted without affecting [he paragraph numbers.
For MSP packer formats refer to Chapter 5.
3.2.1 UPLINK MSP CHANNEL I
(Reserved for specific services management)
The description of this channel has not yet been developed.
3.2.2 UPLINK MSP CHANNEL 2
(Traffic information service (TIS))
The TIS shall have the capability to generate automatic alert information on any aircraft that carries an operating transponder (Mode
A/C or Mode S) or aircraft thal are under primary radar tracking inlegrated with the SSR system.
Note.- The trgfic irforr7mrion service (TIS) is intended to inzprove the sofiery and encienc): of "see and avoid" flight by
providing the pilot with a/z a~ltornnticd isplay oj~zearhytm fJIfJIncr zd wnn~irzgso f any potcrztially threatenirzg trafSic conditio~zs.T he
TIS is furzctionally equivalerrt to ACAS I, providi~zg traflc advisories but ito resolictioiz udvisory information. By utilizing the
sclr~veillanced atabase nzairztained by Mode S grourzd irlterrogators arld its datcr link, tlze TIS can provide airborne trafic alerting
with a mi/zir.rznm airborne equipage r-eqcrirenzent. The XIS is provided withor,lt an>; ATC involvenzent.
3.2.2.2 TIS UPLINK MESSAGE FORMATS
All TIS uplink messagcs shall be suuctured as shown below. Each TIS uplink message shall be 56 bits. TIS traffic data messages
shall consist of one or more short-form MSP packets. There shall be three Lypes of TlS uplink messages as follows:
2) "Goodbye"
3'1 "Traffic data"
Message Traffic Trafic
Header t)pc block I block 2
....
8 bits 6 bits 21 bils 21 bits
Part 1 Annex 10 - Aeronautical Telecommunications
Note.- The jormats of TXS downlink messages are defined in section 4 of this appendix under broadcast identifier 0ZI6
3.2.2.2.1 Message header
The 8-bit header shall be present in all TIS messages. The message header for TIS shall have the value 02 (hexadecimal), since all
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