CAMBRIONIX TS3-16, Руководство пользователя

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TS3-16 Page 10 of 21
5.3.Scalability
USB3 hubs generally has an endpoint limit, which limits the number of devices that can be
enumerated when connected to the USB3 port of a local computer. USB3 port xHCI host
controllers in most computers limit the number of endpoints that can be enumerated to
between 64 and 128. Mobile devices enumerate as more than one endpoint, and complex
devices with touch panels often enumerate as 5 or 6 endpoints. Consequently, the number of
devices that can be successfully enumerated is typically limited to less than twenty.
By using Thunderbolt™ connectivity and incorporating host controllers inside the hub each port
can handle up to 16 endpoints, meaning a total of 256 endpoints per hub. If you wish to
synchronise more than 16 devices, multiple hubs can be daisy-chained to allow up to 96 devices
to be managed from a single host computer simultaneously.
In order to daisy-chain multiple hub, 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
one of the Thunderbolt™ ports. The next hub in the daisy-chain is then connected using one of
its Thunderbolt™ ports to the remaining Thunderbolt™ port of the first hub. A third, fourth and
fifth hub can be added in the same way, connecting the available Thunderbolt™ port of the
previous hub to one of the Thunderbolt™ ports of the next device in the daisy-chain. Using this
approach, a maximum of six hubs can be linked together, allowing a total of 96 devices to be
synced from a single host computer.