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Web GUI Monitoring & Control

The MODCOD histogram, shown in Figure 4.17, displays the statistical composition of the physical

layer signal. In this example the display shows that the demodulator is detecting that

approximately 49.9% of the symbols received are part of physical layer (PL) frames transmitted

using 8PSK rate 3/4 (short FEC, with pilots). Less than 0.1% of the symbols received are part of

dummy PL frames, while the remainder (approximately 50%) are part of PL frames transmitted

using 16APSK rate 3/4 (short FEC, with pilots).

4.7.3.4.1 Interpretation

By default, the percentage frequencies in the histogram are expressed in terms of symbols. By

using the drop-down box, the user may change this analysis to compute the percentage

frequencies in terms of PL frames, or payload bits.

4.7.3.5 Baseband Header Statistics

The baseband header statistics function may be selected by clicking on the sixth icon, in the row

of seven. A window, similar to that displayed in Figure 4.18 is displayed with the selected icon

highlighted in blue.

Figure 4.17: Baseband Header Statistics Window

The base-band header statistics display comprises a table. Each row of the table represents a

base-band stream, referred to by its stream identifier, or ISI. The column headings of the table are

described in the following paragraphs.

4.7.3.5.1 ID

This is the Input Stream Identifier (ISI).

4.7.3.5.2 Age

The interval since a PL frame, corresponding to a particular ISI, was last received at the

demodulator, expressed in seconds (s) or minutes (m).

SBD75e Series Demodulator Installation and Operation Manual

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Advantech SBD75e Series Especificaciones Pagina 55