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a) Modes A and C:
b) intermode; and
c) Mode S.
Note.- The recognition process is dependent upon the signal input level and the specified dynamic range
(3.1.2.10.1).
3.1.2.4.1.1.1 Mode A and Mode C interrogation recognition. A Mode A or Mode C interrogation shall be recognized
when a PI - P3 pulse pair meeting the requirements of 3.1.1.4 has been received, and the l~adinge dge of a P, pulse wih
an amplitude that is greater than a level 6 dB below the amplitude of P3 is not received within the interval from 1.7 to
2.3 microseconds following the leading edge of P3.
If a P, - P2 suppression pair and a Mode A or Mode C interrogation are recognized simultaneously, the transponder shall
be suppressed. An interrogation shall not be recognized as Mode A or Mode C if the transponder is in suppression
(3.1.2.4.2). If a Mode A and a Mode C interrogation are recognized sitnultaneously the transponder shall complerc the
transaction cycle as if only a Mode C interrogation had been recognized.
3.1.2.4.1.1.2 Intermode interrogation recognition. An internode interrogation shall be recognized wheu a P, - P3 -P4
pulse triplet meeting the requirements of 3.1.2.1.5.1 is received. An interrogation shall not be recognized as an intermode
interrogation if:
a) the received amplitude of the pulse in the P4 position is smaller than 6 dB below the amplitude of P,; or
b) the pulse interval between Pg and P4 is larger than 2.3 microseconds or shorter than 1.7 microseconds; or
c) the received amplitude of P, and P, is between MTL and 4 5 dBm and the pulse duration of P, or P3 is less than
0.3 microsecond; or
d) the transponder is in suppression (3.1.2.4.2).
If a P, - P, suppression pair and a Mode A or Mode C intermode interrogation are recognized simultaneously Lhe
transponder shall be suppressed.
3.1.2.4.1.1.3 Mode S interrogation recognition. A Mode S interrogation shall be recognized when a P6 pulse is
received with a sync phase reversal within the in~erval from 1.20 to 1.30 microseconds following the leading edge of
P,. A Mode S interrogation shall not be recognized if a sync phase reversal is not received within the interval from
1.05 to 1.45 microseconds following the leading edge of P,.
Annex 10 - Aeronautical Telecommunicatio~~s Volume ZV
3.1.2.4.1.2 Interrogation acceptance. Recognition according to 3.1.2.4.1 shall be a prerequisite for acceptance of any
interrogation.
3.1.2.4.1.2.1 Mode A and Mode C interrogation acceptance. Mode A and Mode C interrogations shall be accepted
when recognized (3.1.2.4.1.1.1).
3.1.2.4.1.2.2 Intermode interrogation acceptance
3.1.2.4.1.2.2.1 Mude NC/S ull- ill inlermyuliun ~iu~-eptuncAe. Mu& NC/S all-call inlerrogadon shall be accepted
if the trailing edge of P4 is received within 3.45 to 3.75 microseconds following the leading edge of P3 and no lockout
condition (3.1.2.6.9) prevents acceptance. A Mode NC/S all call shall not be uccepted if the railing cdgc of Pq is rcccivcd
earlier than 3.3 or later than 4.2 microseconds following the leading edge of P,, or if a lockout condition (3.1.2.6.9)
prevents acceptance.
3.1.2.4.1.2.2.2 Mode A/C-only all-call interrogation acceptance. A Mode AIC-only all-call interrogation shall not be
accepted by a Mode S transponder.
Note.- The technical condition for non-acceptance of a Mode A/C-only all-call is given in. the preceding paragraph
by the requirement jor rejecting an intermode interrogation with a PJ pulse having a trailing edge following the leading
edge of Pj by less than 3.3 micmseconds.
3.1.2.4.1.2.3 Mode S intcrrogatio~z accqta~zce. A Modc S interrogalion shall only be accepted if:
a) the transponder is capable of processing the uplink format (UF) of the interrogation (3.1.2.3.2.1.1);
b) the address of the interrogation matches one of the addresses as defined in 3.1.2.4.1.2.3.1 implying that parity is
established, as defined in 3.1.2.3.3;
c) no all-call lockout condition applies, as defined in 3.1.2.6.9; and
d) the transponder is capable of processing the uplinked data and presenting it at an output interface as prescribed in
3.1.2.10.5.2.2.1.
3.1.2.4.1.2.3.1 Addresses. Mode S interrogations shall contain either:
a) aircraft address; or
b) the all-call address; or
C) the broadcast address.
3.1.2.4.1.2.3.1.1 Alrcraj? address. If the aircraft's address is identical to the address extracted from a received
interrogation according to the procedure of 3.1.2.3.3.2 and 3.1.2.3.3.2.1. the extracted address shall be considered correct
for purposes of Mode S interrogation acceptance.
3.1.2.4.1.2.3.1.2 All-call address. A Mode S-only all-call interrogation (uplink format UF = I 1) shall contain an
address, designated ~ h cal l-call address, consisting of twenty-four consecutive ONEs. If the all-call address is extracted
　
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