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the MSP packets on downlink channel 3 that are sent each time the criterion for h e contract is met. The subfield shall be interpreted
as follows:
RDS = 0 Send only bits I to 40 of the user data field on downlink MSP 3 when the contract criterion is met.
RDS = 1 Send bits 1 to 96 of the user data held on downlink MSP 3 when the contract criterion is met
Note.- RDS only indicates the length of the user dntn*field in downlink MSP3 when responding with a vulue zero irz the Cl,feld
(see 3.3.3.4.3.1).
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No. 77
Annex 10 - Aeronautical Telecommunications Volume ZIZ
3.2.6.3.1.2.3 BDS l and BDS2 codes 8 bits
(Bits 17 to 24 of the uplink MSP6 user data field)
BDSl and BDS2 codes of the register for which the contract is reyuired shall be as specified in Annex 10, Volume W.
3.2.6.3.1.3 Minimum time (MT) 8 bits
The decimal value of the 8-hit MT field shall represent the minimum time in seconds that shall elapse after a report has been eventtriggered
and sent to the lranspondcr, before a new report can be initiated. The report sent to the transponder shall always be the
most current data available.
3.2.6.3.1.4 Event initiation
Event initiation shall be controlled by the two following fields.
3+2.6.3.1.4.1 Event criterion subfield (EC) 4 bits
The EC field shall be the four most significant bits following the MT field. If multiple events occur within a single register being
monitored by a dataflash contract, (e.g. if more than one parameter shows a significant change) only one message shall be triggered.
The decimal value of the EC field shall be interpreted as follows:
0 NO report required, discontinue service for the contract specified in the DH field.
1 Report any change.
2 56-bit change field (CQ) follows ST. Only report changes to bits indicated by a "ONE" in CQ.
3 56-bit field CQ follows ST. For each parameter report all status changes and all changes of the parameter greater than the
quantum value indicated in the same units and resolution ol thc field in CQ corresponding to that parameter. A zero in
h e field in CQ corresponding to the parameter indicates that no reports are required.
4 112 bits of CQ plus CT follow ST. The first 56 bits are as for the EC value 3 above. The second 56 bits are the CT field
indicating a threshold value in the field corresponding to the parameter. Report all changes above the threshold where the
value in CQ gives the change quantum.
5 112 bits of CQ plus CT follow ST. Same as for the EC value 4 above except: report all changes below the threshold.
6 112 bits of CQ plus CT follows ST. Same as for EC values 4 and 5 above except: report only when the threshold is crossed
(in either direction).
7 to 14 Not assigned
15 Cancel all contracts for the I1 code in this request.
3.2.6.3.1.4.2 Stable time field (ST) 4 bits
The ST field shall be the 4 bits following the EC field. The decimal value of ST shall indicate in seconds how long the changed
data have been stable, to within the change quanta specified in the CQ field, before a message shall be initiated. A value of "ZERO
in this subfield shall indicate that there is no minimum stable time and any change immediately initiates a message. The significance
of the ST shall be dependent on which EC mode is being used. For EC modes 4 and 5, regarding stability whilst above/bclow a
threshold, if a paramctcr value remains abovehelow the defined threshold for greater than the ST timc then a dataflash message
shall he generated even il' the value does not remain stable to within one quantum. Subsequent quantum changes which are stable
for greater than the ST time shall generate further dataflash messages until the value falls belowtriscs above the threshold.
28/11/02
No. 77
Part Z Annex I0 - Aeronautical Telecommunications
3.2.6.3,l.j Change fields - change quanta (CQ) and change threshold (CT)
These fields shall be present when indicated in EC. For a transponder reglster service (i.e. for BDSl and BDS2 from 1 to 255
inclusive), CQ shall be contained in bits 41 to 96 of the MSP 6 user data field. CT, when required, shall be contained in bits 97 lo
152 of the MSP 6 user data field. The quantum value in the CQ field shall be indicated in the same units and resolution as thosc
specified for the register being monitored. It shall specify the amount by which the parameler must change, from its value at the
initialization of the contract, and thereafter from the value last reported by a dataflash response, in order to trigger a new dataflash
response on downl~nkM SP channel 3 (see Table 3-1 j.
3.2.6.3.2 Local system management
The purpose of the local system management is to provide a particular ground-air service request that can be defined locally to
meet particular requirements (such as for ground station "remote setting" of parameters at the far-field monitor).
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