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Network Topology without GPS Glock
Achieving PTP synchronization between multiple cameras requires all cameras to be on
the same network/subnet. The IEEE 1588 best master clock algorithm will select a cam-
era as the master clock. Each camera will synchronize to this master clock.
This restriction is due to the current inability of any network card hardware to forward PTP
sync multicast packets between ports within the 1 μs requirement.
Network Topology with GPS Clock
The cameras can be synchronized to a GPS timer, allowing “real world time” synchroniza-
tion. Configure
PtpMode
on all of the cameras to
Slave
or
Auto
. In Auto, the IEEE 1588
best master clock algorithm will elect the GPS clock as the master. Each camera will
synchronize to the GPS master clock.
Notice
To ensure a reliable synchronization, the GPS master clock must be configured with a
Sync interval between 0.5 s and 2 s (according to the Default PTP profile for use with
the delay request-response mechanism).
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