Newtec M6100 - Page 139

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Data Interfaces M6100 Broadcast Satellite Modulator
The Buffer Delay equals Max Traffic Jitter + 200ms if not limited by the Max Buffer
Delay value. In case the reference clocks of TS encoder and modulator are the same,
the buffer will cope with up to 500 ms traffic jitter when Max Traffic Jitter is set at 300
ms.
Max Buffer Delay
If Max Buffer Delay is lower than Max Traffic Jitter + 200ms, then the Max Buffer Delay parameter
value is used as the configured set point. This is useful when the reference clock differences are
well known (e.g. could be zero if input TS and the modulator clock are on the same reference) to
limit the buffer delay.
Monitoring parameters:
• Buffer Delay: the configured set point of the de-jitter buffer. It equals the Max Traffic Jitter +
200ms;
• Min Buffer Filling = The minimum measured value over a time interval;
• Max Buffer Filling = The maximum measured value over a time interval.
The "Minimum/Maximum Buffer Filling" monitoring parameters allow for checking the
dimensioning of the buffer size. Minimum values close to zero or maximum values
close to twice the " Buffer Delay" monitoring value mean the buffer is too small.
Example:
If it is known that Maximum Traffic Jitter = 20 ms and the difference between the reference clocks of
the TS and the modulator could be up to 30 ppm, then set
• Max Traffic Jitter = 20 ms;
• Max Buffer Delay = 220 ms.
Monitoring parameters will give, once the slow control loop is in steady-state,
• Minimum buffer filling: 200 ms;
• Maximum buffer filling: 240 ms.