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1 = function radiated in normal mode (in Basic data word 2 the back azimuth status also indicates that back azimuth transmission is to follow).
3. These bits are reserved for future applications. One possible application is to define the back azimuth deviation scale factor.
4. Basic data words 4 and 6 are transmitted in both approach azimuth and back azimuth coverages if back azimuth guidance is provided, while retaining
the maximum specified time between transmissions in each coverage sector.
5. Basic data word 5 is transmitted in both approach azimuth and back azimuth coverages if back azimuth guidance is provided, while retaining the
maximum specified time between transmissions in each coverage sector.
6. These bits are reserved for future applications requiring high transmission rates.
7. Coding for I21 and I22:
I21 I22
0 0 DME transponder inoperative or not available
1 0 Only IA mode or DME/N available
0 1 FA mode, Standard 1, available
1 1 FA mode, Standard 2, available
8. The value coded is the actual beamwidth (as defined in Chapter 3, 3.11.1) rounded to the nearest 0.5 degree.
9. Code for I29 is:
0 = pulse clearance signal
1 = scanning clearance signal.
10. The 12 data bits of the preamble are preceded by an 0.832 millisecond interval (13 clock pulses) of CW for carrier acquisition (see Table A-1).
11. The scan limits are greater than the proportional guidance sector limits shown in Basic data words 1 and 5 as described in 3.11.4.5.1.
12. All spare bits are set to ZERO.
Table A-8. Auxiliary data function timing
(see 3.11.4.3.4)
Event time slot begins at
Event
15.625 kHz
Clock pulse
(number)
Time
(milliseconds)
Preamble 0 0
Address transmission (Bits I13 - I20) 25 1.600
Data transmission (Bits I21 - I69) 33 2.112
Parity transmission (Bits I70 - I76) 82 5.248
End function (airborne) 89 5.696
End guard time; end function (ground) 5.900
23/11/06 APP A-6
Appendix A Annex 10 — Aeronautical Communications
Table A-9. Auxiliary data words address codes
No. I13 I14 I15 I16 I17 I18 I19 I20 No. I13 I14 I15 I16 I17 I18 I19 I20
1 0 0 0 0 0 1 1 1 33 1 0 0 0 0 1 0 1
2 0 0 0 0 1 0 1 0 34 1 0 0 0 1 0 0 0
3 0 0 0 0 1 1 0 1 35 1 0 0 0 1 1 1 1
4 0 0 0 1 0 0 1 1 36 1 0 0 1 0 0 0 1
5 0 0 0 1 0 1 0 0 37 1 0 0 1 0 1 1 0
6 0 0 0 1 1 0 0 1 38 1 0 0 1 1 0 1 1
7 0 0 0 1 1 1 1 0 39 1 0 0 1 1 1 0 0
8 0 0 1 0 0 0 1 0 40 1 0 1 0 0 0 0 0
9 0 0 1 0 0 1 0 1 41 1 0 1 0 0 1 1 1
10 0 0 1 0 1 0 0 0 42 1 0 1 0 1 0 1 0
11 0 0 1 0 1 1 1 1 43 1 0 1 0 1 1 0 1
12 0 0 1 1 0 0 0 1 44 1 0 1 1 0 0 1 1
13 0 0 1 1 0 1 1 0 45 1 0 1 1 0 1 0 0
14 0 0 1 1 1 0 1 1 46 1 0 1 1 1 0 0 1
15 0 0 1 1 1 1 0 0 47 1 0 1 1 1 1 1 0
16 0 1 0 0 0 0 1 1 48 1 1 0 0 0 0 0 1
17 0 1 0 0 0 1 0 0 49 1 1 0 0 0 1 1 0
18 0 1 0 0 1 0 0 1 50 1 1 0 0 1 0 1 1
19 0 1 0 0 1 1 1 0 51 1 1 0 0 1 1 0 0
20 0 1 0 1 0 0 0 0 52 1 1 0 1 0 0 1 0
21 0 1 0 1 0 1 1 1 53 1 1 0 1 0 1 0 1
22 0 1 0 1 1 0 1 0 54 1 1 0 1 1 0 0 0
23 0 1 0 1 1 1 0 1 55 1 1 0 1 1 1 1 1
24 0 1 1 0 0 0 0 1 56 1 1 1 0 0 0 1 1
25 0 1 1 0 0 1 1 0 57 1 1 1 0 0 1 0 0
26 0 1 1 0 1 0 1 1 58 1 1 1 0 1 0 0 1
27 0 1 1 0 1 1 0 0 59 1 1 1 0 1 1 1 0
28 0 1 1 1 0 0 1 0 60 1 1 1 1 0 0 0 0
29 0 1 1 1 0 1 0 1 61 1 1 1 1 0 1 1 1
30 0 1 1 1 1 0 0 0 62 1 1 1 1 1 0 1 0
31 0 1 1 1 1 1 1 1 63 1 1 1 1 1 1 0 1
32 1 0 0 0 0 0 1 0 64 0 0 0 0 0 0 0 0
Note.— Parity bits I19 and I20 are chosen to satisfy the equations:
I13 + I14 + I15 + I16 + I17 + I18 + I19 = EVEN
I14 + I16 + I18 + I20 = EVEN
APP A-7 23/11/06
Annex 10 — Aeronautical Communications Volume I
23/11/06 APP A-8
Table A-10. Auxiliary data
(see 3.11.4.8.3.1)
Word Data content
Type
of
data
Maximum time
between
transmissions
(seconds)
Bits
used
Range of
values
Least
significant
bit
Bit
number
A1 PREAMBLE digital 1.0 12 see Note 6 I1 - I12
Address 8 I13 - I20
Approach azimuth antenna offset 10 –511 m to +511 m
(see Note 3)
1 m 121 - I30
Approach azimuth antenna to
MLS datum point distance
13 0 m to 8 191 m 1 m I31 - I43
Approach azimuth alignment with
runway centre line
12 –20.47° to +20.47°
(see Notes 3 and 7)
0.01° I44 - I55
Approach azimuth antenna
coordinate system
1 See Note 2 I56
Approach azimuth antenna height 7 –63 m to +63 m
(see Note 3)
1 m I57 - I63
SPARE 6 See Note 8 I64 - I69
PARITY 7 See Note 1 I70 - I76
A2 PREAMBLE digital 1.0 12 See Note 6 I1 - I12
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