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MB message, Comm-R
AP addresslparity
3.1.2.6.6.1 MB: Message, Comm-B. This 56-bit (33-88) downlink field shall be used to transmit data link messages
to the ground.
3.1.2.6.7 SURVEILLANClDEE NTl7Y REPLE DOWNLINK FORMAT 5
This reply shall be generated in response to an interrogation UF 5 or 21 with an RR field value less than 16.--The format
of this reply shall consist of these fields:
Field Reference
DF downlink format
FS flight status
DR downlink request
UM utility message
ID identity
AP addresdparity
3.1.2.6.7.1 ID: id en ti^ (Mode A code). This 13-bit (20-32) field shall contain aircraft identity code, in accordance
with the pattern for Mode A replies in 3.1.1.6. Starting with bit 20, Lhe sequence shall be C1, Al, C2, A2, C4, A4, ZERO,
Bl, Dl, B2, D2, B4, D4.
Annex I0 - Aeronautical Telecommunications Volume lV
3.1.2.6.8 COMM-B IDENTITY REPLK DOWNWNK FORMAT 21
This reply shall be generated in response to an interrogation UF 5 or 21 with an RR field value greater than 15. The format
of this reply shall consist of thcse fields:
Field Reference
DF downlink format
FS flight status
DR downlink request
UM utility message
ID identity
MB message, Comm-B
AP address/parity
3.1.2.6.9.1 Multivite all-call lockout
Note.- The mulrisite lockout protocol prevents tmnsponder acquisirian from being denied one ground station by
lockout communds from an adjacent ground station that has overlapping coverage.
3.1.2.6.9.1.1 The multisile lockout command shall be transmitted in the SD field (3.1.2.6.1.4.1). A lockout command
for an II code shall be transmitted in an SD with DI = 1 or DI = 7. An I1 lockout command shall be indicated by LOS
code equals I and the presence of a non-zero interrogator identifier in the IIS subfield of SD. A lockout command for an
SX code shall be transmitted in an SD with DI = 3. SI lockout shall be indicated by LSS equals 1 and the presence of a
non-zero inlemgator identifier in the SIS subfield of SD. After a transponder has accepted an interrogation containing a
multisite lockout command, that transponder shall commence to lock out (i.e. not accept) any Mode S-only all-call
interrogation which includes the identifier of the interrogator that commanded the lockout. The lockout shall persist for
an interval T,, (3.1.2.10.3.9) after the last acceptance of an interrogation containing the multisite lockout command.
Multisite lockout shall not prevent acceptance of a Mode S-only all-call interrogation containing PR codes 8 to 12. If a
lockout command (LOS = 1) is received together with IIS = 0, it shall be interpreted as a non-selective all-call lockout
(3.1.2.6.9.2).
Note 1.- Fifteen interrogators can send independent multisire II lockout commands. In addition, 63 interrogators
can send independent SI locko~itc ommands. Each of these lockout commands must be tinzed separately.
Note 2.- Multisite lockout (which only uses non-zero II codes) does not affect the response of the transponder to Mode
S-only all-call interrngations containing 11 equtzls 0 or to Mode NCJS all-call interrogations.
3.1.2.6.9.2 Non-selective all-call lockout
Note I.- In cases where the multisite lockout protocol for XI codes is not required (e.g. there is no overlapping
coverage or there is ground station coordination via grozlnd-to-ground cornmunications) the non-selective lockout protocol
may be used.
On acceptance of an interrogat~o~coi ntaining code I in the PC ficld, a transponder shall commence to lock out (i-e. not
accept) two types of all-call intcrrogahons.
a) the Mode S-only all-call (UF = 1 I ) , with XI equals 0; and
Chapter 3 Annex I0 - Aeronautical Telecommunicaliom
b) the Mode AICIS all-call of 3.1.2.1.5.1.1.
This lockout condition shall persist for an interval TD (3.1.2.10.3.9) after the last receipt of the command. Non-selective
lockout shall not prevent acceptance of a Mode S-only all-call interrogation containing PR codes 8 to 12.
Note 2.- Nan-selecnve lockout does not ajject the response of the trunsponder to Mode S-only all-call znterrogutions
containing I1 not equal to 0.
3.1.2.6.10 BASIC DATA PROTOCOLS
3.1.2.6.10.1 Flight status protocol. Flight status shall be reported in the FS field (3.1.2.6.5.1).
3.1.2.6.10.1.1 Alert. An alert condition shall be reported in the FS field if the Mode A identity code transmitted in
Mode A replies and in downlink formats DF equals 5 and DF equals 21 are changed by the pilot.
3.1.2.6.10.1.1.1 Permunent ulerr condition. The alert condition shall be maintained if the Mode A identity code is
changed to 7500, 7600 or 7700.
3.1.2.6.10.1.1.2 Temporary a b ~ cro rzdition. The alert condition shall be temporary and shall cancel itself after Tc
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