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UM field. If it is the reserved site it shall attemr~t to close out the messagc in a subsequent interrogation. If it is not
the reserved site it shall not attempt to close out the message.
3.1.2.6.1 1.3.2.2 Multisite-directed Comm-B transmissions. To direct an air-initiated Comm-B message to a specific
interrogator, the multisite Comm-B protocol shall be used. When the B-timer is not running, the interrogator identifier of
the desired destination shall be stored as the Comm-B 11. Simultaneously the B-timer shall be started and the DR code
shall be set lo 1. For a multisite-directed Comm-B message, the B-timer shall not automatically time out but shall continue
to run until:
a) the message is read and closed out by the reserved site; or
b) the message is cancelled (3.1.2.10.5.4) by the data link avionics.
Note.- The protocols of 3.1.2.6.5.3 and 3.1.2.6.11.3.2.1 will then result irz delive y of the message to the reserved site.
The data link avionics may cancel the message if delivery to the reserved site cannot be uccomplished.
3.1.2.6.11.3.2.3 Mulhsite Comm-B closeout. The interrogator shall close out a multisite air-initiated Comm-B by
transmitting either a surveillance or a Cornm-A interrogation containing:
either DI = 1
IIS = assigned interrogator identifier
MBS = 2 (Comm-B closeout)
or DI = 0, 1 or 7
IIS = assigned interrogator identifier
PC = 4 (Comm-B closeout)
The transponder shall compare the US of the interrogation to the Comm-B I1 and if the interrogator identifiers do not
match, the messaxe shall not be cleared and the status of the Cornm-B 11, B-timer, and DR code shall not be changed. If
the interrogator identifiers match, the transponder shall set the Comm-B 11 to 0, reset the B-timer, clear the DR code for
this message and clear the message itself. The tra~~spondeshr all not close out a multisite air-initiated Comm-B message
unless it has been read out at lcast once by the resewed site.
3.1.2.6.11.3.2.4 Autornutic expiratio11 af Canzrn-B reservation. IF the 13-timer period expires before a multisite closeout
has been accomplished, the Comm-B I1 shall be set to 0 and the B-timer reset. The Cornrn-B message and the DR field
shall not be cleared by the transponder.
Note.- This makes it possible for another site to read and cleor this rnessugc
Annex 10 - Aeronautical Telecommunications Volume lV
3.1.2.6.1 1.3.3 Additional protocol for non-selective air-initiated Comm-B
Note.- In cases where the multisite protocols ure not required (i.e. no overlapping coverage or sensor coordination
viu ground-to-ground cornmunicution,), the non-selective air-initiated Comm-B protocol may be used.
3.1.2.6.1 1.3.3.1 Message transfel: The interrogator shall extract the message by transmitting either RR equals 16 and
DI is not equal to 7, or RR equals 16, DI equals 7 and RRS equals 0 in a survcillancc or Comm-A interrogation.
3.1.2.6.1 1.3.3.2 Comm-B clnseoi~t.T he interrogator shall close out a non-selcctive air-initiated Cornm-B message by
transmitting PC equals 4 (Comm-B closeout). On receipt of this command, the transponder shall perform closeout, unless
the B-timer is running. If the B-timer is running, indicating that a multisile reservation is in effect, closeout shall be
accomplished as pcr 3.1.2.6.11.3.2.3. The transponder shall not close out a non-selective air-initiated Comm-B message
unless it has been read out at least once by an interrogation using non-selective protocols.
3.1.2.6.1 1.3.4 Enhanced airinitiated Comm-R protocol
Nore.- The enhanced air-initiated Comrn-B protocol provides a higher data link capacity by permitting parallel
delivc~yo f air;initiuted Canzrrt-B ni,essuges by up lo ~ z ~ l rirnnte rrogutors, onefur euch II code. Operation without the need
for rnultisite Comm-B reservations is possible in regions of overlapping coverage for interrogators equipped for the
enhanced air-initiated Comnz-B protocol. The protocol is fully conformant to the standard multisite protocol and thus is
computible with interrogutors thur are not equippedfor the enhanced protocol.
3.1.2.6.11.3.4.1 The transponder shall be capable of storing each of the sixteen 11 codes: (1) an air-initiated or
multisite-directed Comm-B message and (2) the contents of GICB registers 2 through 4.
Note.- GICB registers 2 rhmugh 4 are used for the Comm-B linking protocol defined in the Mode S subnetwork SARPs
(Annex 10, Volume Ill, Part I, Chapter 5).
3.1.2.6.11.3.4.2 Enhanced multisite uir-initiated Comm-B protocol
3.1.2.6.11.3.4.2.1 Initiation. An air-initiated Comm-B message input into the transponder shall be stored in the
registers assigned to I1 = 0.
3.1.2.6.11.3.4.2.2 Announcement and extraction. A waiting air-initiated Comm-B message shall be announced in the
DR field of the rcplies to all interrogators for which a multisite directed Comm-B message is not waiting. The UM field
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