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MTM400 MPEG Transport Stream Monitor User Manual 3-81
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t(now)
t(-1)
t(-63)
t(rest)
PID1
PID100
Time
Start time
Timespan
Count
Figure 3-33: Service logging - Data storage
The timing resolution should not be set too fast or data may reach the bottom of the
grid (t(rest)) before it can be read. If data does reach the bottom of the grid, it is not
lost but it is accumulated in the final row. Accumulated data is added to the bottom
row for up to three days. After this time the data is discarded and the PID is no
longer monitored.
When a service log is being monitored from multiple locations, only one location
should be selected to consume entries. This will allow all locations adequate time
to view or log the entries.
The customer must balance the level of detail required (the timing resolution) with
the infrastructure that is required to collect, store, and collate the information.
Typically the timing resolution is set for 1000 ms; in this case the grid cell will
contain a value approximating to 'packets per second'; to improve accuracy each
count has an associated duration.