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datajlash service taking this into account.
3.3.3.2.10 When the transponder has not been selectively interrogated by a Mode S interrogator with a particular 11 code for
60 seconds (dcrermined by monitoring the IIS subfield in all accepted Mode S interrogations), all dataflash contracts related to that
I1 code shall be cancelled with no indication to the ground system.
3.3.3.3 SERVICE PROVISION
On the receipt of a datallash request, the requested parameters shall be monitored and transferred to the ground using the Mode S
air-initiated protocols directed to the I1 codc that was contained in rhe requesting interrogation. In order to prevent the flooding of
the transponder with dataflash messages, an upper limit of ten messages in a six-second period shall be imposed. When the limit
of ten messages within a six-second period is reached, further messages shall be queued until they can be sent. Messages queued
Part Z Annex 10 - Aeronautical Telecommunications
in this way shall respond with a CI field value of 6. If after initiating a dataflash message to the ground, the change criterion is
met again prior to the message being entered into the transponder for announccment, the message is considered stale and shall be
replaced by the most up-to-date information.
3.3.3.4 ROWNWNMKE SSAGE STRUCTURE
The information shall be transferred in a downlink MSP packet with the channel number M/CH = 3. The format is shown in
Table 3-2. The first two bytes of the user data (UD) field shall contain a dataflash header (DH) which shall be identical to thc DH
field that was contained in the request for service.
3.3.3.4.1 Bits 17 to 31 of UD form the I1 code contract report (CR) field in which each bit shall indicate that at least one
contract is active with the II code, which the bit represents when it is set to a ONE; otherwise, there are no active contracts wilh
that LI code.
3.3.3.4.2 Bits 32 to 36 of UD are not assigned.
3.3.3.4.3 Bits 37 to 40 of UD form the contract information (CX) field which shall be interpreted as follows:
CIfield value Meaning
Response to existing contract
New contract established
New contract not accepted, or existing contract terminated, due to no transponder
register data service
New contract not accepted due to maximum number of contracts already being
serviced
Contract terminated for the DH in this response due to a request from the ground
All contracts terminated for the I1 code that delivered the MSP packet having an
EC value of 15 that requested this response
Response has been queued due to the limit of six dataflash messages in a
ten-second periodm
Contract terminated due to failure of the register data service
Unassigned
New contract not accepted due to invalid number in EC field of requested uplink
MSP packet
3.3.3.4.3.1 When the CI field is equal to zero, the response shall be as requested by the RDS field in the dataflash header of
the contract (see 3.2.6.3.1.2.2). When the CI field is not equal to zero, the response shall only contain bits 1 to 40 of the user data
field on downlink MSP 3 (sec Table 3-2).
3.3.3.5 DATA EXTRaCTlON BY MODE S GROUND STATIONS
The dataflash transaction shall be announced as a downlink frame in response to interrogations UF 4, 5, 20, or 21. The transaction
announced shall be either a single segment Comm-B frame or a two segment Comm-B frame, as requested by the contract
negotiations. The air-directed Comm-B first segment shall contain the MSP header, dataflash headcr, and control information for
that particular contract. In the case of a contract for a single segment response, if the data is required, it is acquired directly by the
ground station extracting the register in question.
3.3.4 DOWNLINKM SP CHANNEL 4
(Reserved for position request)
The description of this channel has no1 yet been developed.
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Nu. 77
Annex 10 - Aeronautical Telecommunications
3.3.5 DOWNLINK MSP CHANNEL 5
Volume I11
This channel has not been assigned.
3.3.6 DOWNLINMKS P CHANNEL 6
(Reserved for response to ground-to-air service request.) (See Table 3-3.)
The first byte of the user data (UD) field in the downlink MSP channel 6 shall be used lo define a response type (RT) field as
follows:
RT = 0 Unassigned
RT= 1 (Reserved)
RT = 2 Local system management
RT = 3 to 255 Unassigned
When implemented, bit 34 of register IDl6 is set to a 1.
Note.- The rrspo~lse to a ground-air service request can be used to transfer information resulting fkm such n service.
3.3.7 DOWNLINK MSP CHANNEL 7
(Reserved for air-to-ground request)
The description of this channel has not yet been developed.
3.3.8 DOWNLINK MSP CHANNEL 8
(Reserved for trajectory negotiation)
　
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