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Two buses are important if you are running > 4-5 users and you wish to maximize the video
performance. With 4 or more simultaneous video's playing the USB bus bandwidth is pushed
and it may impact video performance. If this happens the U170 will drop frames from the video.
To find out how many USB buses your PC has, simply open Device Manager and view "Devices
by connection". The number of "Standard Enhanced PCI to USB host Controller" is the number
of USB buses. In the example below, the PC has two USB buses.
To take advantage of multiple controllers, connect any downstream hubs back to the PC directly
rather than connecting all U170s downstream of one USB connection. Adding an additional USB
controller card through a PCI slot to a PC is also an option. Depending on how many U170
devices attached to the PC and how many USB buses the PC has, there are typically no
bottlenecks between the U170 stations and the host. Normal PC network performance rules
apply to the host PC, and the most common limit is the connection bandwidth to your Internet
service provider. However, this bandwidth is a shared resource for all users, whether using
individual PCs or using a shared environment.
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