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>I00 knots
>I00 knots
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3.1.2.6.1 1.2.1 Comm-B data selectol; BDS. The 8-bit BDS code shall detcrmine the register whose contents shall be
transfemed in the MB field of the Comrn-B reply. It shall be expressed in two groups of 4 bits cach, BDSl (most
significant 4 bits) and BDS2 (least significant 4 bits).
>lo0 knots
>I00 knots
or
or
Note I.- The transponder register allocution is specified in Annex 10, Volume I l l , Purt I, Chapter -5, Table 5-24.
or
or
Annex 10 - Aeronautical Telecommunications Volume IV
Note 2.- The only registers defined in this section are those for aircraft identification (3.1.2.9.1.2), datalink capability
reporting (3.1.2.6.10.2.2), extended squitter (3.1.2.8.6.2) an,d downlink aircraft parameters (DAPs) (3.1.2.10.5.2.3).
3.1.2.6.11.2.2 BQSl code. The BDSl code shall be as defined in the RR field of a surveillance or Comm-A
interrogation.
3.1.2.6.1 1.2.3 BDSZ code. The BDS2 codc shall be as defined in the RRS subfield of the SD field (3.1.2.6.1.4.1) when
DI - 7. If no BDS2 code is specified (i.e. DI is not equal to 7) it shall signify that BDS2 = 0.
3.1.2.6.11.2.4 Protocol. On receipt of such a request, the MB field of the reply shall contain the contents of the
requested ground-initiated Cornrn-B register.
3.1.2.6.1 1.3.1 Gcncrul protocol. The transpondcr shall announcc the prescnce of an air-initiated Comrn-D message
with the insertion of code 1 in the DR field. To extract an air-initiated Comm-B message, the interrogator shall transmit
a request for a Comm-R message reply in a srlbsequent interrogation with RR equal to 16 and, if DI equals 7, RRS must
bc equal to 0 (3.1.2.6.1 1.3.2.1 and 3.1.2.6.1 1.3.3.1). Receipt of this request code shall cause the transponder to transmit
the air-initiated Comm-B message. If a command to transmit an air-initiated Comm-B message is received while no
message is waiting to be transmitted, the reply shall contain all ZEROS in the MB field.
The reply that delivers the message shall continue to contain code I in the DR field. After a Comm-B closeout has been
accomplished, the message shall be cancelled and the DR code belonging to this message immediately removed. If another
air-initiated Comm-B message is waiting to be transmitted, the transponder shall set the DR code to 1, so that the reply
contains the announcement of this next message.
Note.- The unnouncement and cancellation protocol ensures that an air-initiuted messuge will not be lost due to uplink
or downlink failures that occur dzlring the delivery process.
3.1.2.6.11.3.2 Additional protocol for rnultisite air-initiutod Cornm-B
Note.- Tho annozlncement of an air-initiated Comm-B nzessage waiting to he delivered muy be uccompunied by a
rnzlltisite reservation status report in the UMfield (3.1.2.6.5.3.2).
Recommendation.- An interrogutor should not uttempt to extract a message if it has determined that it is not the
reserved site.
3.1.2.6.11.3.2.1 Message transfer An interrogator shall request a Comm-B reservation and extract an air-initiated
Comm-B message by transmitting a surveillance or Comm-A intcrrogation UF equals 4, 5, 20 or 21 containing:
RR = 16
DI = 1
IIS = assigncd interrogator identifier
MBS = I (Comm-B reservation request)
Note.- A Comm-B multisite reservation request is nomally accompanied by a Conznz-B reservation status request
(RSS = I). This causes the interrogator identij5er of the reserved site to be inserted in the UMfield of the reply.
3.1.2.6.11.3.2.1.1 Protocol procedure in response to this interrogation shall depend upon the state of the B-timer
which indicates if a Cornm-B reservation is active. This timer shall run for TR seconds.
Note 1.- The value of TR is given in 3.1.2.10.3.9.
a) If the B-timer is not running, the transponder shall grant a reservation to the requesting interngator by:
Chapter 3 Annex 10 - Aeronautical Telecornrnunications
1) storing the IIS of the interrogation as the Comm-B II; and
2) starting the B-timer.
A multisite Cornm-B rcscrvation shall not be granted by the transponder unless an air-initiated Cornrn-B message
is waiting to be transmitted and the requesting intetrogation contains RR equals 16, DI equals 1, MBS equals 1
and US is not 0.
b) If the B-timer is running and the IIS of the interrogation equals the Comm-B JI, the transponder shall restart the
B-timer.
c) If the B-timer is running and the US of the interrogation does not equal the Cornm-B 11, then there shall be no
change to the Comm-B 11 or the B-timer.
Note 2.- In case c) the reservution request has been denied.
3.1.2.6.1 1.3.2.1.2 In each case the transponder shall reply with the Comm-B message in the MB field.
3.1.2.6.11.3.2.1.3 An interrogator shall determine if it is the reserved site for this message through coding in the
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