The PodNet Hub can be used to connect up to 8 PodNet devices together.

It can be used un-powered so one of the PODULES connected to will will supply the power to all the other PODULES,
or
it can be used powered via a 24V power supply (POD PSU) to supply power to all the PODULES connected to it.

It allows you to pass PodNet messages from one PODULE to all the other PODULES connected giving you a central connection point for all your Cat5 cables