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II equals 0 all-call interrogations.
3.1.2.5.2.1.5.2 Duration of lockoul
Note I.- Supplementary acquisition consists of locking out a c q u i ~ dai rcraft to II = 0 followed by acquisitions by
means of the Mode S-only all-call interrogation with II equals 0.
Note 2.- Minimizing the lockout time reduces the probability of conflict with the acquisition activities of a
neighbouring interrogator that is also using II equals 0 for supplementary acquisition.
3.1.2.5.2.1.5.2.1 Recommendation.- Interrogators pevonning supplementary acquisilior~ using I1 equals 0 (in
connection with the technique of3.1.2.5.2.1.4) should pe$orm acquisition by transmitting a lockout command for no more
than a single scan to each of the acquired aircrafi in the beam dwell containing the garble zone.
3.1.2.5.2.1.5.2.2 Recommendation.- Mode S only all-call interrogations with i I = 0 for the purpose of
supplernenta y acquisition should take place over no more than two consecutive scans.
3.1 2.5.2.2 All-cull reply, downlink format 11
1 6 9 33
The reply to thc Mode S-only all-call or the Mode AICIS all-call interrogation shall be the Mode S all-call reply, downlink
format 11. The formar of this reply shall consist of these fields:
Field Refe ference
DF downlink format 3.1.2-3.2.1.2
CA capability 3.1.2.5.2.2.1
AA address announced 3.1.2.5.2.2.2
PI paritylinterrogator identifier 3.1.2.3.2.1.4
3.1.2.5.2.2.1 CA: Capability. This 3-bit (6-8) downlink field shall contain an encoded definition of the
communications capability of the transponder and shall be used in the all-call reply format (DF = 11).
Coding
0 signifies no communications capability (surveillance only), and no ability to set CA code 7 and
cither airborne or on the ground
reserved
reserved
reserved
signifies at least Comm-A and Comm-B capability and ability to set CA code 7 and on the
ground
signifies at least Comm-A and Comm-B capability and ability to set CA code 7 and airborne
signifies at least Comm-A and Comm-B capability and ability to set CA code 7 and either
airborne or on the ground
signifies the DR field is not equal to 0 or the FS field equals 2, 3, 4 or 5, and either airborne
or on the ground
Annex 10 - Aeronautical Telecommunications Volume ZV
When the conditions for CA code 7 are not satisfied, insrallations that have communications capability but do not have
automatic means to set the on-the-ground condition shall usc CA code 6. Aircraft with automatic on-the-ground
determination shall use CA codc 4 or 5. Data link capability reports (3.1.2.6.10.2.2) shall be available from aircraft
installations [hat set CA code 4, 5, 6 or 7.
Note.- CA codes I to 3 are reserved for use by Mode S transponders that do not have the ablltty to set CA code 7.
Transponders wit11 these codes will provide n dotn link rf~pnbiliqre port (3.1.2.6.10.2.2). No data link transactions other
than GICB extraction including aircraj? identity, ACAS RA extraction, und downlink brnadcost extraction, should be
attempted witlz these transponders.
3.1.2.5.2.2.2 AA: Address announced. This 24-bit (9-32) downlink field shall contain the aircraft address which
provides unambiguous identification of the aircraft.
3.1.2.5.3 Lockout protocol. The all-call lockout protocol defined in 3.1.2.6.9 shall be used by the interrogator with
respect to an aircraft once rhs address of that specific aircraft has been acquired by an interrogator.
Note.- Following acquisition, a transponder is intermgated by discretely addressed interrogations as prescribed in
3.1.2.6, 3.1.2.7 and 3.1.2.8 and the all-call lockout protocol is used to inhibit replies to further nll-mll interrogations.
3.1.2.5.4 Stochastic all-call protocol. The transponder shall execute a random process upon acceptance of a Mode Sonly
all-call with a PR code cqual to 1 to 4 or 9 to 12. A decision to reply shall be made in accordance with the probability
specified in the interrogation. A transponder shall not reply if a PR codc equal to 5, 6, 7, 13, 14 or 15 i s received
(3.1.2.5.2.1.1).
Note.- The random occurrence of replies makes it ~ossiblefo r the interrogator to acquire closely spaced aircraft,
replies from which would otherwise synchronously garble euuh other:
3.1.2.6 ADDRESSESDUR VEILLANCE AND STANDARD LENGTH
COMMUNICATlON TRANSACTlONS
Note 1.- The interrogntions described in this section are addressed to specific uircraft. There are two busic
interrogation and reply types, short and long. The short interrogations and replies are UF 4 and 5 and DF 4 and 5, while
the long interrogutions and replies are UF 20 and 21 and DF 20 and 21.
Note 2.- The conznzunications protocols n r ~g i v ~ nin 3.1.2.6.11. These protocols describe the control of thc data
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