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I need to connect a printer with a parallel port to a computer with only a USB 2.0 bus.

I'd like to do so without lowering the USB 2.0 bus speed to USB 1.1.

All the USB-to-Parallel adapter cable found so far seem to be rated as USB 1.1 and they come with a CD which presumably contains a necessary driver.

I haven't purchased one and tested it out yet, but if so, would the cable's driver lower speed of USB 2.0 bus?

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1 Answer 1

The parallel port specification itself is the limiting factor here; the fastest it can go in ECP mode is 2.5 MByte/s, which is somewhat faster than USB 1.1's maximum speed but much slower than USB 2.0. So even if you find a parallel port adapter that can do ECP (and your printer can do it as well) and USB 2.0, it won't be much faster than USB 1.1

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i don't think that's exactly what is being asked. the question sounds like the OP's concerned with the effect of using a USB 1.1 device on a USB 2.0 bus -- ie, will other devices on the same hub experience speed drops because of this USB 1.1 device. –  quack quixote Mar 4 '10 at 17:15
Yes, that's what I'm concerned with. It's not an issue of the print speed, but of the possibility of a USB 1.1 driver for the USB-to-parallel cable slowing down the entire USB 2.0 bus. –  user30153 Mar 5 '10 at 15:31
@cumminjm: I see. No, that should not be a problem - especially if you connect it directly to the PC, since each USB port is usually a completely independant host. But it should even be possible to mix USB 1 and 2 devices on an USB 2 hub without adverse effects. –  Michael Borgwardt Mar 9 '10 at 9:39

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