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a reply is elicited only from thc transponder uniquely addressed by the interrogation.
Note I.- Mode A/C transponders are suppressed by Mode S interrogations and do not reply.
Note 2.- There are 25 possible interrogation (uplink) formats and 25 possible Mode S reply (downlink) fonnuts. For
fonnat assignnzent see 3.1.2.3.2, Figures 3-7 and 3-8.
2.1.2.1.1 Recommendation- Adnzinistrations should coordinate with appropriate national and internationul
authorities those implementation aspects of the SSR system which will permit its optimum use.
Note.- In order to permit the eJficient operation of ground equipment designed to eliminate interference from unwanted
aircraft transponder replies to adjacent interrogators (defruiting equipment), States may need to develop coordinated
plans for the assignment of pulse recurrence frequencies (PRF) to SSR interrogators.
2.1.2.1.2 The assignment of interrogator identifier (11) codes, where necessary in areas of overlapping coverage,
across international boundaries of flight information regions, shall be the subject of regional air navigation agreements.
ANNEX 10 - VOLUME IV 2-1 28/11/02
Annex 10 - Aeronautical l'elecommunica~ions Volume IV
2.1.2.1.3 The assig~~mculT~ stu rveillance identifier (SI) codes, where necessary in areas of overlapping coverage, shall
be the subject of regional air navigation agreements.
Note.- The SI lockout f a c i l i ~c annot be used unless all Mode S transponders within coverage range are equipped for
this purpose.
2 1.2.2 Mode A and Mode C interrogations shall be povided.
Note.- This requirement may he satisfied by internode interrogations which elicit Mode A and Modc C rcplics from
Mode A/C transponders.
2.1.2.3 Recommendation.- In areas where improved aircraft identification is necessary to enhance the effectiveness
of the ATC system, SSR ground facilities having Mode S features should include aircraft identification capability.
Note.- Aircraft identification reporting through the Mode S data link provides unambiguous identijication o f aircraft
suitably equipped.
2.1.2.4 SIDE-LOBSEU PPRESSION CONTROL INTERROGATION
2.1.2.4.1 Side-lobe suppression shall be provided in accordance with the provisions of 3.1.1.4 and 3.1.1.5 on all
Mode A, Mode C and intermode interrogations.
2.1.2.4.2 Side-lobe suppression shall be provided in accordance with the provisions of 3.1.2.1.5.2.1 on all Mode Sonly
all-call interrogations.
2.1.3 Transponder reply modes (air-to-ground)
2.1.3.1 Transponders shall respond to Mode A interrogations in accordance with the provisions of 3.1.1.7.12.1 and
to Mode C interrogations in accordance with the provisions of 3.1.1.7.1 2.2.
Note.- if pressure-altitude injormation is not avuiluble, transponders reply to Mode C interrogations with framing
pulses only.
2.1.3.1.1 The pressure altitude reports contained in Mode S replies shall be derived as specified in 3.1.1.7.12.2.
Note.- 3.1.1.7.12.2 is intended to relate to Mode C replies and specifies, inter alia, that Mode C pressure altitude
reports be referenced fo u standard pressure setting of 1 013.25 hectopasculs. The intention of 2.1.3.1.1 1s to ensure that
all transponders, not just Mode C t~ansponders,r eport uncorrected pressure altitude.
2.1.3.2 Where the need for Mode C automatic pressure-altitude transmission capability within a specified airspace has
been determined, transponders, when used within thc airspncc conccrncd, shall respond to Mode C interrogations with
pressure-altitude encoding in the information pulses.
2.1.3.2.1 From I January 1999, all transponders, regardless of the airspace in which they will be used, shall respond
lo Mode C interrogations with pressure-altitude information.
Note.- Operation of the airborne collision avoidance system (ACAS) depends upon intruder aircraft reporting
pressure-altitude in Mode C replies.
2.1.3.2.2 Recommendation- For aircraft with 7.62 rn (25 It) or better pressure altitude sources, the
pressure-altitude information provided by Mode S transponders in response ro selective interrogations (i.e. in the ACfield,
3.1.2.6.5.4) should bc reported in 7.62 11z (25 ft) increttre~ts.
Chapter 2 Annex 10 - Aeronautical Tebcommunicadions
Note.- Peifirmance of the ACAS is signcficnntly enhanced when an intruder aircraft is reporting pressure-altitude in
7.62 m (25 fr) increments.
2.1.3.2.3 All Mode A/C transponders installed on or after 1 January 1992 shall report pressure-altitude encoded in
the information pulses in Mode C replies.
2.1.3.2.4 All Mode S transponders installed on or after 1 January 1992 shall report pressure-altitude encoded in the
information pulses in Mode C replies and in the AC field of Mode S replies.
2.1.3.2.5 All Mode S transponder equipped aircraft with 7.62 m (25 ft) or better pressure altitude sources shall report
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