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Technical Provisions for Mode S Services and Extended Squitter

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C-32 <strong>Technical</strong> <strong>Provisions</strong> <strong>for</strong> <strong>Mode</strong> S <strong>Services</strong> <strong>and</strong> <strong>Extended</strong> <strong>Squitter</strong><br />

2. B2 Low (Class B2 Transmit Power Less Than 70 Watts)<br />

= 0: Greater than or equal to 70 Watts Transmit Power<br />

= 1: Less than 70 Watts Transmit Power<br />

3. UAT IN (Universal Access Transceiver)<br />

= 0: Aircraft has NO UAT Receive capability<br />

= 1: Aircraft has UAT Receive capability<br />

4. NAC V (Navigation Accuracy Category <strong>for</strong> Velocity)<br />

5. NIC Supplement-C (NIC Supplement <strong>for</strong> use on the Surface)<br />

C.2.3.10.4 Operational <strong>Mode</strong> (OM)<br />

This 16-bit (“ME” bits 25 – 40, Message bits 57 – 72) subfield shall be used to indicate the Operational<br />

<strong>Mode</strong>s that are active on board the aircraft. Encoding of the OM subfield <strong>for</strong> Airborne Operational Status<br />

Messages (Subtype=0) shall be as shown in Table C-25. Encoding of the OM subfield <strong>for</strong> Surface<br />

Operational Status Messages (Subtype=1) shall be as shown in Table C-26.<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-25. Airborne 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 />

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 />

Subfield Coding:<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 />

Single<br />

Antenna<br />

Flag<br />

[1]<br />

System<br />

Design<br />

Assurance<br />

[2]<br />

Reserved<br />

[8]<br />

Draft<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 />

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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