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XR - when?

Posted: Fri Oct 01, 2004 8:38 pm
by wirdo
Great feature on new atheros cards is available for 4-5 months already but not in routeros yet... please update drivers to include it. Thanks!

Re: XR - when?

Posted: Sat Oct 02, 2004 10:17 am
by mag
could you explain a bit, what feature this is and why it would be important to have it?

tia.
matthias

Posted: Sat Oct 02, 2004 11:24 am
by wirdo
ask google.

Posted: Sat Oct 02, 2004 12:26 pm
by stephenpatrick
Looking on the web at some articles:

http://www.theregister.co.uk/2003/09/15 ... ifi_range/

http://wireless.ittoolbox.com/browse.as ... aper%2Epdf

http://www.networkcomputing.com/showite ... D=15200422

It is a proprietary "WiFi extension" on the later chipsets, which "supports low SNR operation". Atheros claims a 3x range extension.
Not sure whether this is supported in MT, I guess not yet, I would expect to see an 'XR' switch to enable/disable.

Regards

Stephen

Posted: Sun Oct 03, 2004 12:32 am
by mag
Not sure whether this is supported in MT, I guess not yet, I would expect to see an 'XR' switch to enable/disable.
thanks for the links, i have seen d-link has boxes (e.g. DWL-2100AP) claiming to use XR. as the white paper states, it works by improving sensibility down to -105 dB and lowering bandwith below 1mbps so it seems to me a technique mostly for the low-cost 802.11g market.

if it is an atheros chipset feature, it should probably not too difficult to make an XR option-switch. nice to have, but not very important.

regards,
matthias

Posted: Tue Oct 05, 2004 6:56 pm
by Hammy
if it is an atheros chipset feature, it should probably not too difficult to make an XR option-switch. nice to have, but not very important.
but wouldn't squeezing a couple extra db out of a link be worth a simple switch?

Posted: Tue Oct 05, 2004 9:00 pm
by mag
but wouldn't squeezing a couple extra db out of a link be worth a simple switch?
as i said: a nice to have low-cost-market feature.
i know what a good receive-amplifier with -105dB costs, therefore i do not think atheros is using such one. the white paper does not mention any other radio parameters too.

regards,
matthias

Posted: Fri Oct 22, 2004 12:51 pm
by jonbrewer
but wouldn't squeezing a couple extra db out of a link be worth a simple switch?
as i said: a nice to have low-cost-market feature.
i know what a good receive-amplifier with -105dB costs, therefore i do not think atheros is using such one. the white paper does not mention any other radio parameters too.

regards,
matthias
Hi Matthias,

I think you have not read about Atheros XR. The receive sensitivity is really this good.

Having XR support means that connections will hold on for another 10db and won't just drop at -92.

This is very important where we can only use 5.2-5.3 GHz at max EIRP of 250mW.

Look at Atheros website!

Cheers,

Jon

Posted: Fri Oct 22, 2004 5:21 pm
by Hammy
Are all modulations increased, or are there just additional ones?