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available with l,~?vtll 7 transponders.
2.1.5.1.5 Level 5 - Level 5 transponders shall have the capabilities of 2.1.5.1.4 and also those prescribed for
enhanced Comm-B and extended length message (ELM) communications (3.1.2.6.1 1.3.4, 3.1.2.7.6 and 3.1.2.7.9).
Note.- Level 5 permits Cornrn-B and extended length data link communications with multiple interrogators without
requiring the use of multisite reservations. This level of transponder has a higher minimum data link capacity than the
other trunsponder levels.
2.1.5.1.6 E-xtended squitter - Extended squilter transponders shall have the capabilities of 2.1.5.1.2, 2.1.5.1.3,
2.1.5.1.4 or 2.1.5.1.5 and also those prescribed for extended squitter operation (3.1.2.8.6). Transponders with this
capability shall be designated with a suffix "e".
Note.- For exanzple, a level 4 transponder with extended squitter capability would be designated "level 4e".
Chapter 2 Annex 10 - Aeronautical Telecommunications
2.1 S.1.7 SI capability - Transponders with the ability to process SX codes shall have the capabilities of 2.1.5.1.2,
2.1.5.1.3, 2.1.5.1.4 or 2.1.5.1.5 and also those prescribed for Sl code operation (3.1.2.3.2.1.4, 3.1.2.5.2.1, 3.1.2.6.1.3,
3.1.2.6.1.4.1. 3.1.2.6.9.1.1 and 3.1.2.6.9.2). Transponders with this capability shall be designated with a suffix "s".
Note.- For mmple, a level 4 transponder with extended squitter capability and SI capability would be designated
"level 4es".
2.1.5.1.7.1 SI code capability shall be provided in accordance with the provisions of 2.1.5.1.7 for all Mode S
transponders installed on or after I January 2003 and by all Mode S transponders by 1 January 2005.
Note.- Mandutesfrom certain States muy require applicability in advance o f these dates.
2.1.5.1.8 Extended squitter non-transponder devices. Devices that are capable of broadcasting extended squitters that
are not part of a Mode S transponder shall confom to all of the 1 090 MHz RF signals in space requirements specified
for a Mode S Lransponder.
2.1.5.2 All Mode S transponders used by international civil air trafic shall conform, at least, to the requirements of
Level 2 prescribed in 2.1.5.1.2.
Note 1.- Level I may be udmitted for use within an individual State or within the terms of a regional air nuvigution
agreement. The Mode S Level I transponder comprises the minimum set of features for compatible operation of Mode S
trunsponders with SSR Mode S interrogators. It is deflned to prevent a proliferation of transponder types below Level 2
which would be incompatible with SSR Mode S interrogators.
Note 2 .Th c intent of the requirement for a Level 2 capability is to ensure the widespread use of an ICAO standard
transponder capability to allow worldwide planning of Mode S ground facilities and services. The requirement also
discourages an initial installution with Level I transponders that would be rendered obsolete by later requirements in
certain airspace for mandatoly carriage of transponders having Level 2 cupabilities.
2.1.5.3 Mode S transponders installed on aircraft with gross mass in excess of 5 700 kg or a maximum cruising true
airspeed capability in excess of 463 km/h (250 kt) shall operate with antenna diversity as prescribed in 3.1.2.10.4 if:
a) the aircraft individual certificate of airworthiness is first issued on or after 1 January 1990; or
b) Mode S transponder carriage is required on the basis of regional air navigation agreement in accordance with
2.1.3.3.1 and 2.1.352.
Note.- Aircraft with maximum cruising true airspeed exceeding 324 km/h (175 kt) are required to operate with a peak
power of not less than 21.0 dBW as specified in 3.1.2.10.2 c).
2.1.5.4 CAPABILITRYE PORTING IN MODES SQUITTERS
2.1.5.4.1 Capability reporting in Mode S acquisition squitters (unsolicited downlink transmissions) shall be provided
in accordance with the provisions of 3.1.2.8.5.1 for all Mode S transponders installed on or after 1 January 1995.
2.1 S.4.2 Recommendation.- Transponders equipped for extended squitter operation should have o means to disable
acquisition squitters when extended squitters are being emitted.
Note.- This will facilitate fhe suppression of acquisition squitters $all ACAS units have been converted to receive the
extended squitter:
2.1.5.5 EXTENDED LENGTH MESSAGE (ELM) TRANSMIT POWER
In order to facilitate the conversion of existing Mode S transponders to include full Mode S capability, transponders
originally manuf~tclured becore 1 Jiu~uary 1999 shall be permilled to trarlsmit a burst of 16 ELM segments at a minimum
power level of 20 dBW.
Annex 10 - Aeronautical Teleco~nmunications
Note.- This represents a I dB relaxation from the power requirement specified in 3.1.2.10.2.
Volume IV
　
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