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of the announcement reply shall indicate that the message is not reserved for any 11 code, i.e., the US subfield shall be
set to 0. When a command to read this message is received from a given interrogator, the reply containing the message
shall contain an IIS subfield content indicating that the message is reserved for the 11 code contained in the intermgation
from that interrogator. After readout and until closeout, the message shall continue to be assigned to thar II code. Once a
message is assigned to a specific I1 code, announcement of this message shall be no longer made in the replies to
interrogators with other I1 codes. IF the message is not closed out by the assigned interrogator for the period of the Btimer,
the message shall revert back to multisite air-initiated status and the process shall repeat. Only one multisite airinitiated
Comm-B message shall be in process at a time.
3.1.2.6.11.3.4.2.3 Closeout. A closeout for a multisite air-initiated message shall only be accepted from the
interrogator that is currently assigned to transfer the message.
3.1.2.6.11.3.4.2.4 Announcement of the next message waiting. The DR field shall indicate a message waiting in the
reply to an interrogation containing a Comm-B closeout if an unassigned air-initiated message is waiting and has not been
assigned to a I1 code, or if a multisite-directed message is waiting for that I1 code (3.1.2.6.11.3.4.3).
3.1.2.6.11.3.4.3 Enhanced multisite directed Comm-B protocol
3.1.2.6.11.3.4.3.1 Initiution. When a multisite directed message is input into the transponder, it shall be placed in the
Comm-B registers assigned to the I1 code specified for the messagc. If the registers for this 11 code are already occupied,
(i.e. a multisite directed message is already in process to this I1 code) the new message shall be queued until the current
transaction with that I1 code is closed out.
Chapter 3 Annex 10 - Aeronautical Telecommunications
3.1.2.6.1 1.3.4.3.2 Announcement. Announcement of a Cornm-B message waiting transfer shall be made using the DR
field as specified in 3.1.2.6.5.2 with the destination interrogator I1 code contained in the IIS subfield as specified in
3.1.2.6.5.3.2. The DR field and IIS subfi~ldc ontents shall be set specifically for the interrogator that is to receive the reply.
A waiting multisite directed message shall only be announced in the replies to the intended interrogator. It shall not be
announced in the replies to other interrogators.
Note 1.- u u rnultisite-directed message is waiting for I1 = 2, the surveillance rcplics to thut interrogator will conrain
DR = I and IIS = 2. I f this is the only message in process, replies to all other interrogators will indicate that no message
is wuiting.
Note 2.- In addition to permitting parallel operation, this form of announcement enables a greater degree of
announcement of downlink ELMS. The unrzouncements for the downlink ELM und the Comm-B share the DRJield. Only
one announcement can take place ut a time due to coding limiturions. In case both a Comm-B and a downlink ELM are
waiting, announcement preference is given to the Comm-B. In the example ubove, f u n air-directed Comm-B was wuitirzg
for II = 2 and a multisite-directed downlink ELM was waiting for II = 6, both interrogators would see their respective
announcements on the first scan since there would be no Comm-B announcement to II = 6 to block the unnouncement of
the waiting downlink ELM.
3.1.2.6.1 1.3.4.3.3 CIoseout. Closeout shall be accomplished as specified in 3.1.2.6.1 1.3.2.3.
3.1.2.6.11.3.4.3.4 Announcement of the next m,essuge waiting. The DR field shall indicate a message waiting in the
reply to an interrogation containing a Cornm-B closeout if another multisite directed message is waiting for that LI code,
or if an air-initiated message is waiting and has not been assigned to a I1 code. (See 3.1.2.6.11.3.4.2.4.)
3.1.2.6.11.3.4.4 Enhanced nan-selective Comm-B protocol. The availability of a non-selective Comm-B message shall
bc announced to all interrogators. Otherwise, the protocol shall be as speciiied in 3.12.6.1 1.3.3.
3.1.2.6.11.4 Comrn-B broadcast
Note 1.- A Comnz-B message may be broadcast to ull active interrogators within range. Messages ure ulternately
numbered I and 2 and are self-cancelling after 18 seconds. Interrogators huve no meuns to cancel Comm-B broadcast
messages.
Note 2.- Use of the Comm-B broadcast is restricted to transmission of information which does not require u
subsequent ground-initiated uplink response.
Note 3.- The timer used for the Comm-B broadcaxt cycle is the same us that used for the Comm-B multisite protocol.
3.1.2.6.11.4.1 Initiation. A Comm-B broadcast cycle shall not be initiated when an air-initiated Comm-B is waiting
to be transmitted. A Comm-B broadcast cycle shall begin with:
　
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