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and either DI does not equal 7 or DI equals 7 and RRS equals 0 shall cause the resulting reply to contain the aircraft
identification in its MB field.
3.1.2.9.1.1 AIS, aircraft identification subfield in MB. The transponder shall report the aircraft identification in the 48-
bit (41-88) AIS subheld of MB. The aircraft identification transmitted shall be that employed in the flight plan. When no
flight plan is available, the registration marking of the aircraft shall be inserted in this subfield.
Note.- When the registration marking of the aircraft is used, it is classified as "fixed direct data" (3.1.2.10.5.1.1J .
When another type of aircraft identification is used, it is classified as "variuble direct data" (3.1.2.10.5.1.3).
3.1.2.9.1.2 Coding of the AIS subfield. The AIS subfield shall be coded as follows:
Note.- Aircraft identification coding provides up to eight chamcters.
33 41 47 53 59 65 71 77 83
The BDS code for the aircraft identification message shall be BDSl equals 2 (33-36) and BDS2 equals 0 (37-40).
Each character shall be coded as a 6-bit subset of the International Alphabcl Number 5 (IA-5) as illustrated in Table 3-7.
The character code shall be transmitted with the high order unit (bd first and the reported aircrafi identification shall be
transmitted with its left-most character first. Charactcrs shall be coded consecutively without intervening SPACE code.
Any unused character spaces at the end of the subfield shall contain a SPACE character code.
40 46 52 58 64 70 76 82 88
BDS Char. 1 Char. 2 Char. 3 Char. 4 Char. 5 Char. 6 Char. 7 Char. 8
Annex 10 - Aeronautical Telecommunications Volume ZV
Table 3-7. Character coding for transmission of aircraft identification by data link
(subset of IA-5 - see 3.1.2.9.1.2)
3.1.2.9.1.3 Aircrafl ident@cation capability report Transponders which respond to a ground-initiated request for
aircraft identification shall report this capability in the data link capability report (3.1.2.6.10.2.2.2) by setting bit 33 of the
MB subfield to 1.
3.1.2.9.1.4 Chunge of uircruJ identifi~-utionI.f 1111: a i l c ~ a ild~e nliLcaliul~r epurled in Lhe AIS subfield is changed
in flight, the transponder shall report the new identification to the ground by use of the Comm-B broadcast message
protocol of 3.1.2.6.1 1.4.
3.1.2.10 ESSENTIASLY STEM CHARACTERISTICS OF THE SSR MODE S TRANSPONDER
3.1.2.10.1 Transponder sensitivity and dynamic range. Transponder sensitivity shall be defined in terns of a given
interrogation signal input level and a given percentage of corresponding replies. Only correct replies containing the
required bit pattern for the interrogat~onr ecetved shall be counted. Given an interrogation that requires a reply according
to 3.1.2.4, the minimum triggering level, MTL, shall be defined as the minimum input power level for 90 per cent replyt-
interrogatioll ratio. Tl~cM TL sllall Ire -74 dl3111+ 3 dB. The reply-lo-ir~kmgaliunr atio ol a Modc S hansponder shall
be:
a) at least 99 per cent for signal input levels between 3 dB above MTL and -21 dBm; and
b) no more than 10 per cent at signal input levels below -81 dBm.
Note.- Transponder sensitivity and output power are described in this section in tenns of signal level at the terminals
of the antenna. This gives the designer freedom to arrange the installation, optimizing cable length and receivertransmitter
design, and does not exclude receiver and/or rrummitter components from becoming an integral part of the
antenna subassembly.
Chapter 3 Annex 10 - Aeronautical Telecommunications
3.1.2.10.1.1 Reply ratio in the presence of inteverence
Note.- The following paragraphs present measures of the performance of the Mode S transponder in the presence of
interferirzg Mode A/C interrogation pulses.
3.1.2.10.1.1.1 Reply ratio in the presence of an interfering pulse. Given a Mode S interrogation which requires a reply
(3.1.2.41, the reply ratio of a transponder shall be at lcast 95 per cent in the presence of an interfering Mode A/C
interrogation pulse if the level of the interfering pulse is 6 dB or more below the signal level for Mode S input signal levels
between -68 dBm and -21 dBm and the interfering pulse overlaps the P6 pulse of the Mode S interrogation anywhere
after the sync phase reversal.
Under the same conditions, the reply ratio shall be at least 50 per cent if the interference pulse levcl is 3 dB or more below
the signal level.
3.1.2.10.1.1.2 Reply rutio in the presence of pulse pair interference. Given an interrogation which requires a reply
(3.1.2.4), the reply ratio of a transponder shall be at least 90 per cent in the presence of an interfering PI - P2 pulse pair
if the level of the interfering pulse pair is 9 dB or more below signal levcl for input signal levels between -68 dBm and
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