Interface Configuration and Interpretation

Input Card Screen - 8VSB

One LED indicator is available in the Readings section of the screen:

RF Lock

This indicates that all decoding systems are in lock and the

 

signal is being decoded normally.

The following graphs are available when the 8VSB interface card is installed:

Figure 3-47: Input card screen - 8VSB (Example)

Symbol Distribution

This graph shows the samples received over time in a falling vertical line display. In a noise-free system, all samples would fall on one of the eight vertical lines. However, in normal systems the samples will be displayed distributed around the vertical lines. At the bottom of the graph display, the sample values are accumulated into a distribution histogram. The histogram can be displayed in a linear or logarithmic format.

Signal to Noise (SNR) (after equalizer)

The SNR values are plotted in a pen-trace style, giving a brief history of the collected values.

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MTM400 MPEG Transport Stream Monitor User Manual