Telestream PRISM MPI2-10, Руководство пользователя

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Application Information
PTP Graphs Application
PRISM MPI2-10-MPX2-10 User Manual
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significant PTP delay variations, while transparent and boundary clocks have much less
variation and total delay.
Elements of the Display Heading
– PTP Lock: Shows the status of the PTP lock.
– Grandmaster ID: Displays the reference Source and Domain.
– PTP Time: Time of day derived from the PTP signals.
– Profile: Shows the profile which has been selected in the reference settings
menu. This is not detected from the incoming PTP messages.
– Resolution: The time increment for each bar on the display. Longer graph
settings collect data into larger bins to be displayed. This range and resulting
resolution are selected in the setting menu for PTP graphs.
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Trace Types: There are four displays available. For each one, the Max., Min., and
Mean (average) are shown on the left, while the traces versus time is shown on the
right. The traces indicate the Max, and Min envelope, and the Mean (average) for
each time bin. The time scale can be adjusted in the settings menu. The data is
logged for 1 day so you can go back and look at long-term trends.
Use the slider to move the displays up or down.
– Slave-Master Delay: This graph indicates the difference in the time stamps for
the PTP Sync messages; these go from the master to the slave. This display
indicates effects of the downstream network delay and adjustments made to the
slave clock. After the slave is locked and the timing is stable, the perturbations on
this graph are largely due to network variations. Traffic often causes some
messages to be delayed so the maximum delay increases.
As the PTP is locking, the slave clock adjusts, so the trace may have large swings
or jumps. As the system locks, the master-to-slave and slave-to-master delays