Time (802.11n/ac/ax/be)

The Time trace shows the time record before digital demodulation and after pulse search, as shown in the following block diagram (refer to the Digital Demodulation Block Diagram).

$image\blk_time_OFDM_wmf.jpg$

The amount of data included in the Time trace display is a function of the Result Length, Measurement Interval and Measurement Offset parameters. The following topics describe how these parameters affect the Time trace data:

Time Trace Data and the Result Length parameters

The following are descriptions of the Time trace behavior, which depends on the Result Length parameters. This is the behavior when Measurement Interval is set to maximum (same as Maximum Result Length or manually specified value) and Measurement Offset is zero.

Automatic mode: The VSA automatically determines the measurement result length. It compares the number of symbol-times detected within the burst to the Maximum Result Length parameter:
- If Maximum Result Length is less than the burst length, the Time trace data shows the number of symbol-times specified by the Maximum Result Length parameter plus 10% of the Maximum Result Length parameter just before the start of the burst. This also includes preamble data.
- If Maximum Result Length is greater than the burst length, the Time trace data shows the entire burst +/- 10% of the burst length (also includes preamble data).
Manual mode: The Time trace data shows data for the number of symbol-times specified by the Manual parameter plus 10% of the Manual parameter just before the start of the burst. This also includes preamble data.

For more information about how the Result Length parameters determine the measurement result length, see Result Length Parameters.

Time Trace Data and the Measurement Interval/Offset parameters

The following are descriptions of the Time trace behavior, which also depends on the Measurement Interval and Offset parameters.

Measurement Interval equal to Result Length
When the Measurement Interval is equal to the maximum, the Time trace data is controlled and specified by the Result Length parameter, see previous section for more information.
Measurement Interval not equal to Result Length
When the Measurement Interval and Measurement Offset parameters are used to specify the data for analysis, the Time trace data includes only the data specified by the Measurement Interval parameter. The display shows only data for the symbol-times specified within the Measurement Interval, all other data before and after the Measurement Interval is excluded. This also means that preamble data will not be shown when using Measurement Interval and Measurement Offset parameters.
$image\OFDM_TimeDataMeasIntvlOfst_wmf.jpg$

For more information about how Measurement Interval and Measurement Offset determine the measurement result length data, refer to Measurement Interval and Offset.

Time Trace data and Averaging

Time trace data is unaffected by Time averaging.