Web GUI Monitoring & Control
4.7.3.5.9
Effects of Stream Isolation
The SBD75e demodulator incorporates an optional ‘stream isolation’ function to mitigate against
un-correctable transmission errors in some circumstances. If this function is engaged, then the
base-band header statistics may not give a complete picture of the content of the physical
layer, with respect to the streams contained within.
4.7.3.6
Output Interface Statistics
The output interface statistics function may be selected by clicking on the seventh icon, in the
row of seven. A window, similar to that displayed in Figure 4.19 is displayed with the selected icon
highlighted in blue.
Figure 4.18: Output Interface Statistics Window
In the window shown above, each of the output interfaces is represented by a separate sub-
table, entitled ‘Output 0’, Output 1, and ‘Output 2’. If an interface is disabled (see ***) then the
relevant table is greyed out.
4.7.3.6.1
ISI
The title row of each sub-table indicates the ISI currently bound to that output (see ***).
4.7.3.6.2
Full, Empty, ISSY and Lock Flags
These four flags are normally green to indicate healthy operation of the output interface. If any,
or all, of the flags are red, then an error has been detected, such as buffer under/over flow
(Empty and Full), stream synchronisation (ISSY), or buffer initialisation (Lock).
4.7.3.6.3
Packet Count, Error Count & Packet Error Rate (PER)
The ‘Packet Count’ field displays the number of user packets received since the interface was
configured. The ‘Error Count’ field displays the number of user packets received with erroneous
CRC bytes. The ‘PER’, or Packet Error Rate, is the ratio of the latter metrics.
SBD75e Series Demodulator Installation and Operation Manual
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