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Resewed
Reserved
Resewed
MEANING
2.3.1 1.8 ~ R M I N AALR EA OPERATIONAL CAPABIWTY STATUS (OM-3)
1 1 0 0
0 1
10
1 1
This 4-bit (29-32) subfield shall be used to indicate the terminal area operational capability status of the ADS-B transmitting system
to other aircraft as specified by the following encoding.
Resewed
Resewed
Reserved
Reserved
Resewed
Reserved
Resewed
Reserved
OM-3 ENCODING: TERMINAL AREA OPERATIONAL CAPABILITY STATUS
Reserved
Reserved
Reserved
Reserved
OM-3 CODING
Bit 29, 30 Bit 31, 32
28/11/02
No. 77
MEANING
0 0
0 1
1 0
11
2.3.1 1.9 APPROACH AND LANDING OYERA770NAL CAPABILITY STATUS (OM-2)
Resewed
Resewed
Resewed
Reserved
0 0
0 1
1 0
11
This 4-bit (33-36) subficld shall be used to indicate the approach and landing operational capability status of the ADS-B
transmitting system to other aircrafi as specified by the following encoding.
Resewed
Reserved
Reserved
Resewed
OM-2 ENCODING: APPROACH AND LANDING OPERATIONAL
CAPABILITY STATUS
2.3.1 1.10 SURFACE OPERATlONAL CAPABILITY STATUS (OM- 1)
OM-2 CODING
Bit 33, 34 Bit 35, 36
0 0 0 0
0 1
1 0
I I
0 1 0 0
0 1
10
1 1
1 0 0 0
0 1
1 0
11
1 1 0 0
0 1
10
11
This Cbit (37-40) subfield shall be used to indicate the surface operational capability status of the ADS-B lransmitting system to
other aircraft as specified by the following encoding.
MEANING
Reserved
Reserved
Resewed
Resewed
Resewed
Reserved
Resewed
Resewed
Resewed
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
OM-I ENCODING: SURFACE OPERATIONAL CAPABILITY STATUS
OM-1 CODING I
Bit 37, 38 Bit 39, 40 ( MEANING
2811 1/02
No. 77
--
0 0 0 0
0 1
1 0
I I
Reserved
Resewed
Reserved
Reserved
Volume 111
Reseived
Reseived
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
2.4 EXTENDED SQUlTTER INITIALIZATION AND TIMEOUT
Initialization and timeout functions for extended squitter broadcasl shall be performed by the transponder and are specified in
Annex 10, 3.1.2.
Note.- A description of these functions is presented in the following paragraphs to serve as reference material for the section
on the general fornzatter/manager (GFM) (see 2.5).
2.4.1 INITIATION OF EXTENDED SQUXTTER BROADCAST
At power-up initialization, the transponder shall commence opcration in a mode in which it broadcasts only acquisition squittcrs.
The transpondcr shall initiate the broadcast of extended squitters for airborne position, surface position, airborne velocity and
aircraft identification when data are inscrtcd into register numbers 0516, 0616, 0916 and 0816, respectively. This determination shall
be made individually for each squitter type. The insertion of altitude or surveillance status data into register numbcr 0516 by the
transponder shall not satisfy the minimum requiremen1 for broadcast of the airborne position squitter.
Note.- Thrs suppresses the transmission of extended squitters from aircrap that are ~rrzablet o report position, velociv or iderltiv
information.
2.4.2 REGISTER TIMEOUT
The transponder shall clear all but the aliitude and surveillance status subfields in the airborne position register (register 0516) and
all 56 bits of the surface position, squitter status and airborne velocity registers (register numbers O6,,, 0716 and 09,,) i f these
registers are not updated within two seconds of the previous update. This timeout shall be determined separately for each of these
registers. The insertion of altitude or surveillance status data by the transponder into these registers shall not qualify as a re,.o lsler
update for the purposcs of this timeout condition.
Note I.- These registers am C I P U ~ L 't~o preverlr the reporting of oatdated position, velocity and sq~iitterr ate iifoni~atioii.
Note 2.- The identification register; 0gI6,i s not aleured sb~ceit c.oiltairts data that rarely chrrriges irtflight and is less jreqrreirtl~
upd~ired.T he event-driven register; 0Al6 or eq~~ivalentrta nsmit register; does not need to hr cleared since its coiiterlts arr on!\.
broadcast once each time that the register is loaded (2.5.5).
Note 3.- D~lrirzga register tirneoslt event, the ME ,field gf the e~-teiideds qlritter inay co~rtairir rll zeros, e-weptJ ilr CI~Ill?cr't a
　
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