THOMSON Amethyst III, Руководство пользователя, Страница: 241 / 306

Appendix B ’SNMP Management’ — Getting Input Snapshot and Statistics
Amethyst III DTV Smart Switch 241
User Manual
Dynamics of the System
Bit Rates Measurement
The following bit rates measurement tables are updated every 5 seconds:
 supPhoIOTSBitRateTable ,
 supPhoIOServiceBitRateTable ,
 supPhoIOPIDBitRateTable .
The supPhoIOTSBitRateTable table contains for each input in the
supPhoIOTSBitRateUpdateStamp field the time of the latest updates
for each input.
Algorithm to get the bit rate measurements is as follows:
1. Read and store (t1) the time of the last update. The date is stored in the
supPhoIOTSBitRateUpdateStamp field present in the supPhoIOTSBitRateTable (t1).
2. Read and store again (t2) the time of the last update.
3. If t1 is equal to t2:
- the reading is good (no update occurred during the reading step),
- send the measurements to the task in charge to handle them,
- wait 5 seconds.
else :
- the reading is false (an update occurred during the reading step),
- discard the measurements,
- wait 1 second.
4. Go to step 1.