Re: [zd1211-devs] Host <-> ZD1211 bandwidth

[<zd1...@co...>]

On Fri, 15 Jul 2005, Adam Hunt wrote:

> When running at full speed, 54Mb/sec how much USB bandwidth is used?
> If a person was a a few bits short of a byte could he expect
> reasonable performance if he attached three or maybe four ZD1211
> devices to a single bus via a hub?

Don't think so. There's considerable protocol overhead (and CPU usage).
Also, as the 802.11b/g channels overlap heavily, you can't use more than
three channels with high bandwidth anyways:
http://en.wikipedia.org/wiki/802.11#Channels_and_international_compatibility

> Also does the current or -ng version of the Linux module support all
> three modes, a, b and g?

The NG driver doesn't do anything of end user interest currently.

I'm not aware of any ZD1211 based adapter supporting 802.11a.

> The product page at ZyDAS says that the ZD1211 includes support for up
> to 4 megs of NAND flash memory if included and not used for something
> else can it be exported as MTD storage?

There are sticks available that come with their windows driver included in
the stick as usb_storage.

> What about the "6 general purpose IO pins and 2 LED pins" can those be
> exported via sysfs?

Not via any available driver. Probably these can only be accessed directly
using a modified firmware, and as its sources are not available...

> One last question, is the ZD1211 a decent USB 802.11a/b/g adapter?

;-)

> Shit, I lied, I have one more.  Is there a list of known ZD1211 based
> devices?

See my previous posting.

Regards