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Register No. Assignment Minirnlrm update rate
4316 Next waypoint information 0.5 s
44 16 Meteorological routine air rcport 1.0 s
4516 Meteorological hazard report 1.0 s
4616 Reserved for flight management system Mode 1 To be detcrmincd
47 16 Reserved for flight management system Mode 2 To be determined
4816 VHF channcl report 5.0 s
4916-4Ft6 Unassigned
5016 Track and turn report
51 16 Position report coarse 0.5 s
5216 Position report fine 0.5 s
5316 Air-referenccd state vector
5416 Waypoint 1
55 16 Waypoint 2
5616 Waypoint 3
57 16-5E~6 Unassigned NIA
5F1h Quasi-static parameter monitoring 0.5 s
6016 Heading and speed report 1.0 s
61,6 Extended squilter emergencylpriorily status 1.0 s
6216 Current trajectory change point 1.7 s
6316 Next trajectory change point 1.7 s
6416 Aircraft operational coordination rnessagc 2.0 s or 5.0 s (2.3.10.1)
6516 Aircraft operational status 1.7 s
6616-6F16 Resewed for extended squitter N/A
70~6-75~6 Reserved for future aircraft downlink parameters N/A
76,6-E016 Unassigned NI A
E116E216 Resewed for Mode S byte NIA
E3,6-F0,6 Unassigned NI A
Fl16-F216 Military applications 15 s
F~I~-FFI, Unassigned NI A
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2.1.1 The details of the dala to be entered into the assigned registers shall be as defined in the following pages of this section.
The above table specifies the minimum update rates at which the appropriate transponder register(s) shall be reloaded with valid
data. If the defined update rate is not maintained, the status bit (if provided) shall indicate that the data in that field are invalid.
2.1.2 The time between the availability of the data at the SSE and the time that the data are processed and appear in the relevant
transponder register shall be less than the minimum update rate specified in the table above.
2.1.3 Recommendation.-The time between the uvuilubilrty of ilrrfu uf the SSE irnd the time thut the datu are processed arid
appears in the relevunt trunsponder register should be us short us possible.
28/11/02
No. 71
Annex 10 - Aeronautical Xelecomrnunications Volume 111
2.1.4 The register number shall be equivalent to the Comm-B data selector (BDS) value used to address that register,
(see 3.1.2.6.1 1.2.1 of Annex 10, Volume IV). Register OA16 shall not be used for GICB or ACAS cross-link read-out. The data link
capability report (register number lol6) shall be updated within one second of the data changing and at least evcry four seconds
thereafter.
2.2 GENJ3RAL CONVENTIONS ON DATA FORMATS
The bit patterns contained in the 56-bit transponder registers shall be considered as valid application data only if;
1) the data link capability report is contained in register number lol6. This is indicated by bit 25 of the data link capability report
contained in register number lol6 being set to "ONE.
2) the GICB service corresponding to the application is shown as "supported" by the corresponding bit in the GICB capability
report register numbers 17,6 to 1C,6 being set to "ONE".
Note I.- The intent of the capability bits in register number 17,6 is to indicate that useful data are contained in the
corresponding transponder register: For this reason, each bitfor a register is cleared if data becomes unavailable (2.5.4.1) and
set again when datu insertion into the register resumes.
Note 2.- A bit set in register numbers 18,6 to ICl6 indicates that the application using this register has been installed on
the aircraft. These bits are not cleared to reflect the real-time loss of an application, as is done for register number 1716 (2.5.4.2).
3) the data value is valid at the time of extraction. This is indicated by a data field status bit (if provided). When this status bit
is set to "ONE", the data field(s) which follow, up to the next status bit, are valid. When this status bit is set to "ZERO", the
data field(s) are invalid.
2.2.2 REPRESENTATIOONF NUMERICAL DATA
Nu~nerical data shall be represented as follows:
1) Numerical data shall be represented as binary numerals. When the value is signed, 2's complement representation shall be
used, and the bit following the status bit shall be the sign bit.
2) Unless otherwise specified, whenever more bits of resolution are available from the data source than in the data field into
which that data are to be loaded, the data shall be rounded to the nearest value that can be encoded in that data field.
3) In all cases where a status bit is used it shall be set to "ONE" to indicate VALID and to "ZERO" to indicate INVALID.
Note.- This facilitates partial loading oj the registers.
4) When present, a switch bit shall indicate which of two alternative data types is being used to update the parameter in the
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