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SRS Segment request subfield
SSS Surveillance status subfield
TAS Transmission acknowledgement subfield
TCS Type control subfield
TMS Tactical message subfield
TRS Transmission rate subfield
When by the application of binary polynomial algebra, x~~ [M(x)i]s divided by G(x) where the information sequencc
M(x) is:
the result is a quotient and a remainder R(x) of degree less than 24. The bit sequence formed by [his remainder represents
the parity check sequence. Parity bit pi, for any i from I to 24, i s lhc coefficient of x24-i in H(x).
Field
ME
MB
MB
MB
MB
UM
SD
UM
SD
SD
SD
SD
SD
SD
SD
SD
MB
MB
SD
MC
ME
MD
SD
SD
MB
Refere~zce
3.1.2.8.6.3.1.2
3.1.2.9.1.1
3.1.2.8.6.8.2
3.1.2.6.1 1.2.1
3.1.2.6.11.2.1
3.1.2.6.5.3.1
3.1.2.6.1.4.1 a)
3.1.2.6.5.3.1
3.1.2.6.1.4.1 d)
3.1.2.6.1.4.1 g)
3.1.2.6.1.4.1 c)
3.1.2.6.1.4.1 c)
3.1+2.6.1.4.1 f)
3.1.2.6.1.4.1 e) and g)
3.1.2.6.1.4.1 c)
3.1.2.6.1.4.1 f)
3.1.2.6.10.2.2.1
3.1.2.6.10.2.2.1
3.1.2.6.1.4.1 g)
3.1.2.7.7.2.1
3.1.2.8.6.3.1.1
3.1.2.7.4.2.6
3.1.2.6.1.4.1f)
3.1.2.6.1.4.1 d)
3.1.2.8.6.8.1
Annex 10 - Aeronautical Ttlecommunications Volume ZV
Note.- The effect of multiplying M(n) by nZ4 is to append 24 ZERO bits to the end of the sequence.
3.1.2.3.3.2 AP and PI field generation. Different address parity sequences shall be used for the uplink and
downlink.
Note.- The uplink sequence is appropriate for a transponder dckoder implementation. The downlink sequence
facilitates the use of error correction in downlink decoding.
The code used in uplink AP field generation shall be formed as specified below from either the aircraft address
(3.1.2.4.1.2.3.1.1), the all-call address (3.1.2.4.1.2.3.1.2) or the broadcast address (3.1.2.4.1.2.3.1.3).
The code used in downlink AF' field generation shall be formed directly from the sequence of 24 Mode S address bits (a,,
a,, ..., a,,), where a; is the i-th bit transmitted in the aircraft address (AA) field of an all-call reply (3.1.2.5.2.2.2).
The code used in downlink PI field generation shall be formed by a sequence of 24 bits (a,, a,, ..., a,), where the first
17 bits are ZEROS, the next three bits are a replica of the code label (CL) field (3.1.2.5.2.1.3) and the last four bits are a
replica of the interrogator code (IC) field (3.1.2.5.2.1.2).
Note.- The PI code is not used in uplink transmissions.
A modified sequence (b,, b, ,..., b,,) shall be used for uplink AP frcld gencmtion. Bit bi is the coefficient of x48-i in the
polynomial G(x)A(x), where:
and
G(x) is as defined in 3.1.2.3.3.1.2.
In the aircraft address ai shall be the i-th bit transmitted in the AA field of an all-call reply. In the all-call and broadcast
addresses ai shall equal 1 for all values of i.
3.1.2.3.3.2.1 Uplink transmission order The sequence of bits transmitted in the uplink AP field is:
tk + 17 l k + 2.. t k + 2 4
where the bits are numbered in order of transmission, starting with k + 1
In uplink transmissions:
tk + i = bi 8 pi
where "8" prescribes modulo-2 addition: i equals 1 is the first bit transmitted in the AP field.
3.1.2.3.3.2.2 Downlink transmission order The sequence of bits transmitted in the downlink AP and PI field is:
l k + 1 7 I k + 2 . . . t k + 2 4
where the bits are numbered in order of transmission, starting with k + 1 . In downlink transmissions:
tk + , = a, Q pi
where "0" prescribes modulo-2 addition: i equals 1 is the first bit transmitted in the AP or PI field.
Chapter 3 Altnex 10 - Aeronautical Xelcco~n~nunications
3.1.2.4 GENERALIN TERROGATION-REPLY PROTOCOL
3.1.2.4.1 Transponder transucticm cycle. A transponder transaction cycle shall begin when the SSR Mode S
transponder has recognized an interrogation. The transponder shall then evaluate the interrogation and determine whether
it shall be accepted. If accep~edi,t shall then process the received interrogation and generate a reply, if appropriate. The
transaction cycle shall end when:
a) any one of the necessary conditions for acceptance has not been met, 01
b) an interrogation has been accepted and the transponder has either:
1) completed the processing of the accepted interrogation if no reply is required, or
2) completed the transmission of a reply.
A new transponder transaction cycle shall not begin until the previous cycle has ended.
3.1.2.4.1.1 Interrogation recognition. SSR Mode S transponders shall be capable of recognizing the following distinct
types of interrogations:
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