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Technical Provisions for Mode S Services and Extended Squitter

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Appendix C C-33<br />

Msg Bit<br />

#<br />

"ME”<br />

Bit #<br />

OM<br />

Format<br />

DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris<br />

Table C-26. Surface Operational <strong>Mode</strong> (OM) Subfield Format<br />

57 58 59 60 61 62 63 -- 64 65 --- 72<br />

25 26 27 28 29 30 31 -- 32 33 --- 40<br />

= 0, 0<br />

Subfield Coding:<br />

TCAS<br />

RA<br />

Active<br />

[1]<br />

0, 1 Reserved<br />

1, 0 Reserved<br />

1, 1 Reserved<br />

IDENT<br />

Switch<br />

Active<br />

[1]<br />

1. TCAS Resolution Advisory (RA) Active<br />

= 0: TCAS II or ACAS RA not active<br />

= 1: TCAS RA is active<br />

Reserved<br />

<strong>for</strong><br />

Receiving<br />

ATC<br />

<strong>Services</strong><br />

[1]<br />

2. IDENT Switch Active<br />

= 0: Ident switch not active<br />

= 1: Ident switch active – retained <strong>for</strong> 18 ±1 seconds<br />

3. Reserved <strong>for</strong> Receiving ATC <strong>Services</strong><br />

= 0: Set to ZERO <strong>for</strong> this Edition of this Manual<br />

4. Single Antenna Flag<br />

= 0: Systems with two functioning antennas<br />

= 1: Systems that use only one antenna<br />

5. System Design Assurance (SDA)<br />

(see Table C-32)<br />

6. GPS Antenna Offset<br />

(see Table C-33 <strong>and</strong> Table C-34)<br />

Single<br />

Antenna<br />

Flag<br />

[1]<br />

System<br />

Design<br />

Assurance<br />

[2]<br />

GPS<br />

Antenna<br />

Offset<br />

[8]<br />

Draft<br />

C.2.3.10.5 Version Number<br />

This 3-bit (“ME” bits 41 – 43, Message bits 73 – 75) subfield shall be used indicate the Version Number of<br />

the <strong>for</strong>mats <strong>and</strong> protocols in use on the aircraft installation. Encoding of the subfield shall be as shown in<br />

Table C-27.<br />

Table C-27. Version Number Encoding<br />

Coding<br />

(Binary) (Decimal)<br />

VERSION NUMBER SUBFIELD<br />

Meaning<br />

000 0 Con<strong>for</strong>mant to Doc 9871, Appendix A<br />

001 1 Con<strong>for</strong>mant to Doc 9871, Appendix B<br />

010 2 Con<strong>for</strong>mant to Doc 9871, Appendix C<br />

011 – 111 3 – 7 Reserved<br />

DRAFT - Working Paper ASP TSGWP11-01 <strong>for</strong> review by the TSG during the meeting in June 2011 in Paris

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