Multiple cameras on a single network

If multiple GigE Vision cameras are connected to a network card through a switch, you may experience packet loss due to collisions.

If two cameras are synchronized and transmitting their images at the same time, it means that the total data rate is momentarily 2 gigabit per second on a 1 gigabit network.

All GigE Vision cameras share a feature to compensate for simultaneous streaming from multiple cameras: GigE Vision Stream Channel Packet Delay (GevSCPD for short and also the actual GenICam name).

This is also called packet delay or inter-packet delay.

It works by putting delays in between each of the packets that each camera transmits. This way, the packets can interleave on the switch.

Interpacket.gif

To calculate the minimum inter-packet delay, you can use the Excel sheet below. The calculation has been updated to work with 10GigE as well as GigE.

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