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45 micrusecunds ufter receipt of the sync phase reversal following a Mode S interrogation that is not accepted (3.1.2.4.1.2)
or that is accepted but requires no reply.
3.1.2.10.3.4.1.3 All Mode S transponders installed on or after 1 January 1999 shall recover sensitivity to within 3 dB
of MTL no later than 45 microseconds after receipt of the sync phase reversal following a Mode S interrogation that is
not accepted (3.1.2.4.1.2) or that is accepted but requires no reply.
3.1.2.10.3.4.2 Recovery after a Mode S Corn-C interrogation A Mode S transponder with Comm-C capability shall
recover sensitivity to within 3 dB of MTL no later than 45 microseconds after receipt of the sync phase reversal following
acceptance of a Comm-C interrogation for which no reply is required.
3.1.2.10.3.5 Utzwanted Mode S replies. Mode S transponders shall not generate unwanted Mode S replies more often
than once in 10 seconds. Installation in the aircraft shall be made in such a manner that this standard shall be achieved
when all possible interfering equipments installed in the same aircraft are operating at maximum interference levels.
3.1.2.10.3.6 Reply rate limiting
Note.- Reply rate limiting is prescribed separately for Modes A and C und for Mode S.
Chapter 3 Annex 10 - Aeronautical Telecommunications
3.1.2.10.3.6.1 Illode S reply rate limiting. Reply rate limiting is not required for the Mode S formats of a transponder.
If such limiting is incorpora~cd for circuit protection, it shall permit the minimum reply rates required in 3.1.2.10.3.7.2
and 3.1.2.10.3.7.3.
3.1.2.10.3.6.2 Modes A and C reply rate limiting. Reply rate limiting for Modes A and C shall be effected according
to 3.1.1.7.9.1. The prescribed sensitivity reduction (3.1.1.7.9.2) shall not affect the Mode S performance of the
transponder.
3.1.2.10.3.7 Minimum reply rate capability, Modes A, C and S
3.1.2.10.3.7.1 All reply rates specified in 3.1.2.10.3.7 shall be in addition to any squitter transmissions that the
transponder is required to make.
3.1.2.10.3.7.2 Minimum reply rate capability, Modes A and C. The minimum reply rate capability for Modes A and
C shall be in accordance with 3.1.1.7.9.
3.1.2.10.3.7.3 Minimum reply rate capability, Mode S. A transponder capable of transmitting only short Mode S
replies shall be able to generate replies at the following rates:
SO Mode S replies in any 1-second interval
18 Mode S replies in a 100-millisecond interval
8 Mode S replies in a 25-millisecond interval
4 Mode S replies in a 1.6-millisecond interval
In addition to any downlink ELM ~ansmissions,a level 2, 3 or 4 transponder shall be able to generate as long replies at
least:
16 of 50 Mode S replies in any 1-second interval
6 of 18 Mode S replies in a 100-millisecond interval
4 of 8 Mode S replies in a 25-millisecond interval
2 of 4 Mode S replies in a 1.6-millisecond interval
In addition to downlink ELM transmissions, a level 5 transponder shall be able to generate as long replies at least:
24 of 50 Mode S replies in any 1-second interval
9 of 18 Mode S replies in a 100-millisecond interval
6 of 8 Mode S replies in a 25-millisecond interval
2 of 4 Mode S replies in a 1.6-millisecond interval
In addition, a transponder within an ACAS installation shall be able to generate as ACAS coordination replies at least 3
of 50 Mode S replies in any 1-second interval.
3.1.2.10.3.7.4 Minimum Mode S ELM peak reply rate
Note I - When a downlink E M i s initiulked (31 2 7 7 I), the Mode S transponder annormrfs thr, lr~ngth( in ~ ~ g m ~ n r ~ )
of the waiting message. The transponder must be able to transmit this number of segments, plus an additional margin to
make up for missed replies, during the beam dwell of the ground interrogator
At least once every second a Mode S transponder equipped for ELM downlink operation shall be capable of transmitting
in a 25-millisecond interval, at least 25 per cent more segments than have been announced in the initialization
(3.1.2.7.7.1). The minimum length downlink ELM capability for level 4 and 5 transponders shall be as specified in
3.1.2.10.5.2.2.2.
Note 2.- A transponder capable of processing the maxirniim length downlink ELM (16 segments) is therefore
required to be able to transmit 20 long replies under the above conditions. Lvel 4 transponder\s nzny be built which
process less than the maxim~i?nm essage length. These transpon,ders cannot initialize a nzessuyc lengtlz that exceeds
their transmitter capability. For exmlple, u transponder that cun transrrzit at most 10 long replies under the above
conditions cun never announce a nzessage of more Ihan 8 segr~zents.
Annex 10 - Aeronautical Telecommunications Volume IV
3.1.2.10.3.8 Reply delay and jitter
Note.-After an interrogation has been accepted and ifa reply is required, this reply transmission begins after afixed
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