PDS-C4
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5.3. Scalability
If you wish to synchronise more devices, multiple hubs can be connected to allow more devices
to be managed from a single host computer simultaneously.
To daisy-chain multiple hubs, each hub needs to be connected to mains power
individually, and the first hub in the chain should be connected to the local computer through
the hub’s “host port”. The host port of the next hub in the daisy-chain is then connected to any
of the first hub's downstream USB ports. More hubs are added in the same way.