Walter Banks <PICLIST@mitvma.mit.edu> wrote:

> Most (if not all) WEB cams support low speed USB. My Canon S110
> digital camera also works just fine on low speed USB.

Walter:

There are three USB speeds, with dumb names that are easily confused.

"Low speed" is 1.5 megabits per second max, limited in most real
applications to about 800 bytes per second.

"Full speed" (which I expect is what you were thinking when you wrote
"low speed") is 12 magabits per second, with a useful throughput of
about 1 megabyte per second.

"High speed" is 480 megabits per second, which works out to a max of
about 53 megabytes per second in the real world.

-Andy

=== Andrew Warren -- aiw@cypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
===
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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