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The data formats for the data link capability report and for aircraft identification together with thc assignment of the broadcast
identifiers shall be as defined in Annex 10, Volumes LII and IV, respectively.
4.2 UPLINK BROADCAST IDENTIFIERS
The following sections are numbered 4.2.X, where "X" is the decimal equivalent of the uplink broadcast identifier number. This is
done to allow definitions of the hitherto undefined formats to be inserted without affecting the paragraph numbering.
4.2.1 UPLINK BROADCAST IDENTIFIER OIlh
(Reserved for differential GNSS correction)
The description of this identifier has not yet been developed.
4.2.2 TO 4.2.47 UPLINK BROADCAST
IDENTIFIERS OZIL to 2F16
These idcntifiers have not been assigncd.
4.2.48 UPLINK BROADCAST IDENTIFIER 3016
(Not valid)
4.2.49 UPLINK BROADCAST IDENTIFIERS 3lI6
(Reserved for RA broadcast (see Annex 10, Volume IV, 4.3.8.4.2.3.4)).
4.2.50 UPLINK BROADCAST IDENTIFIERS 3216
(Reserved for ACAS (see Annex 10, Volume IV, 4.3.8.4.2.3.3)).
4.2.51 TO 4.2.255 UPLINK BROADCAST
IDENTIFIERS 3316 to FFI6
These identifiers have not been assigned.
4.3 DOWNLINK BROADCAST IDENTIFIER
The following sections are numbered 4.3.X, where " X is the decimal equivalent of the downlink broadcast identifier number. This
is done to allow definitions of the hitherto undefined formats to be inserted without affecting the paragraph numbering.
2811 1/02
No. 77
Part 1
This identifier has not been assigned.
Annex I 0 - Aeronautical Telecommunications
4.3.1 DOWNLINBKR OADCAST IDENTIFIER 0lI6
4.3.2 DOWNLINBKR OADCAST IDENTIFIER 0Zl6
(Traffic informalion service)
4.3.2.1 INTRODUCTION
The trafic information service shall be provided by uplinking information on pro xi mat^ aircraft that may be of interest to
own-aircraft by a Mode S interrogator on uplink MSP channel 2.
Note.- The service and uplink messhges are specified in 3.2.2 under "Uplink MSP Channel 2"
It shall be possible for the aircraft to request to be either connected to or disconnected from the TIS service. These requests shall
be madc using the Mode S broadcast protocol using broadcast identifier OZl6. These requests sllall be the only downlink messages
used by the TIS.
4.3.2.2 T f l DOWNLINK MESSAGES
The TIS airborne data link scrvice shall be able to generate two types of Mode S downlink messages:
a) TIS service connect request (TSCR); and
b) TIS service disconnect request (TSDR).
Both the TSCR and the TSDR shall be sent as Comm-B broadcast messages using the broadcast identifier Ozl6.
Note.- The use of the Mode S Comm-B broadcast protocol deals with the case qf nnlliltiple Mode S inrerrogators with
overlapping coverage, which are in contact with a given TIS aircraft at the same time.
The format of a TIS downlink message (either TSCR or TSDR) shall be as specilicd below:
Header DIN 1 DIN 2 DIN 3 DIN 4 DIN 5 DIN 6
8 bits 8 bils 8 bits 8 bits 8 bils 8 bits 8 bits
The message header shall be the standard mcssagc header for TlS described in uplink MSP channel 2 (see 3.2.2, uplink MSP
channels). The 8-bit data link service identifier numbers (DIN) shall be read and processed sequentially from lhc TCSR or TSDR
message until either:
a) DLN i = 0; or
b) all bits of the downlink message have been processed.
Note I.- This structure and protocol for MSP dow~zli~zske rvice recJLlests allow.fi~rf~~feix~parnes ion and use by other MSP data
link services.
Note 2.- The principal and altenzate T1S 11 codes in the TIS process (see 3.2.2, Uplink MSP Channel 2) are set to the "tlorle"
state when either a TSCR or TSDR is generated.
28/11/02
No. 77
A~zrzex 10 - Aeronautical Telecommunications Volume 111
This TTS Comm-B downlink message shall be generated when the pilot requests the initiation of TIS service. The TSCR mcssage
shall be generated at the same time as the MSP capability report bit for TIS is set to "ONE. A TSCR shall be identified by a DIN
value of 1. The TSCR shall be defined as a Comm-B broadcast message so that any Mode S ground interrogator capable of
supporting TIS can respond to it.
4.3.2.2.2 TSDR formclt
This TIS Comm-B broadcast downlink message shall be generated when the pilot requests termination of TIS service. The TSDR
message shall be generated at the same time as the MSP capability report bit for TIS is set to "ZERO". A TDSR shall be identified
by a DIN value of 2. The TDSR shall be defined as a Comm-B broadcast message so that any Mode S interrogator supporting TIS
can respond to it.
4.3.3 TO 4.3.15 DOWNLINBKR OADCAST
IDENTIFIERS 0316 to OFl6
These identifiers have not been assigned.
4.3.16 DOWNLINBKR OADCAST IDENTIFIER lol6
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