From Crystal Instruments
A Spider system with multiple modules uses PTP to synchronize the internal clocks of each module over
the Ethernet network so that all input channels can be accurately phase-matched. Each module is
connected to a central switch that routes messages from each connected module through its ports. PTP
synchronization will work regardless of whether the switch is PTP-enabled or not. PIP works by
measuring the signal path delay between each module, and the more precisely this delay can be
measured and predicted the more accurately the clocks can be synchronized. With a regular, non-PTP
switch, the delay through the switch can vary greatly depending on the network load. This adds an
unknown variable into the PTP delay calculation and limits the accuracy of the clock synchronization.
PTP-enabled switches dramatically improve the ability of the PIP protocol to estimate delay, and,
therefore, increase the precision to which the clocks can be synchronized.
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