User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
The transponder's 256 BDS registers are commonly notated in
hexadecimal format with the first register notated as BDS 0,0 (0016 or 0
decimal) and the last register notated as BDS F,F (FF16 or 255 decimal).
Each BDS register consists of 56 bits as specified in the ICAO Manual of
Mode S Specific Services and Mode S Standard and Recommended
Practices (SARPs). Each BDS register contains the data payload of a
specific Mode S reply or extended squitter. Registers not updated within
a fixed time are cleared, i.e. filled with 0's. Refer to Figure 1-38 for a
simplified block diagram of DAPS Data Processing.
Figure 1-38: XS-950 Transponder DAPS Data Processing
BDS registers currently specific to 1090 ES ADS-B are:
● 0,5 Airborne Position
● 0,6 Surface Position
● 0,7 Status
Pub. No. 8600200-001, Revision 004
34-45-29
1-121
04 Nov 2014
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