USB Hubs

India
March 1, 2009 6:05am CST
How many USBs can be connected to a computer at a time?(with or without HUB)? ehh???
1 response
@owlwings (41633)
• Cambridge, England
1 Mar 09
The USB specification is designed to support 127 devices, including hubs (which may be connected in a tree structure to five levels deep). If any of your devices draw power from the USB, you will have to consider powered hubs because the use of too many powered devices will quickly cause intermittent operation otherwise.
• India
1 Mar 09
Oh!Thank You For The Reply! :) But still...will the USB get enough speed as when it is connected to an actual USB port?
1 person likes this
@owlwings (41633)
• Cambridge, England
1 Mar 09
You should obviously expect a drop in speed the more active devices you have connected. A device that is idle will probably not affect the speed greatly but if you have a number of devices, all of which are in use, you have to bear in mind that the PC is constantly polling each device and sharing the processing between them. How much speed you will lose is impossible to say and exactly what you consider 'enough speed' depends on your perception. USB cables should be no longer than 5 meters (and the shorter the better). The times involved may only be measured in microseconds but a USB device is a two-way device and handshaking between devices is seriously affected the more the devices and the longer the cables.