is mikrotik support this future??
i read some artical about it that it help very much in outdoor envirment
anyone have info lets share
The nstream and XR is absolutely different things..why do you think that it is imortant? in my personal opinion, nstreme is better in doing the same thing
i test it on D-Link-2100 and 7100 with d-link G650(pcmci) and G520(PCI), it`s work there where usual 802.11b/g do not work. Now i use XR on my AP`s based on AP39 platform.. but i can`t use it with Mikrotik It is very a pity that the Mikrotik does not support this standard..have you tested that it actually does this? or is this a marketing trick?
If N-Streme doesn't like low signal links, wouldn't XR assist by being able to better process a frame when at a low receive signal?Just my $0.02 here -
AFAIK XR allows the atheros radio to work at lower signal strengths than the 802.11 standard normally allows - hence the range improvements.
Atheros have an explanation on their site.
That might help some setups (especially indoor WLAN or hotspot) but will probably upset Nstreme, which in our tests generally doesn't like "marginal" signals very much, due to the re-processing/packing of packets into frames - i.e. a lost/errored frame can lose more than one packet.
Comments from others welcome. Personally, I'd like to see the feature added, we can all turn it on/off as the specific scenario requires.
Regards
Introduction ¶
This document applies to the madwifi-ng source code. Conclusion provided here were based on the analysis of the source code revision r1531.
Theory of operation ¶
XR means "eXtended Range". This is a mode which extends the operational range of an AP by using lower and non standards rates : 0.25 Mb, 0.5 Mb, 1 Mb, 2 Mb, 3 Mb. It probably use the OFDM modulation as in 802.11g. Since it's a proprietary Atheros extension, several points needs to be taken care of :
XR mode only works between two devices having such capabilities. To know the capabilities of an AP, a special Information Element (IE XR) is contained in its beacon.
An AP might handle clients in XR mode and clients in non-XR mode. Since non-XR mode clients won't receive XR mode packet, we might have a hidden node problem. To avoid this situation, the XR mode seems to be a polled mode. The polling is probably initiated by the AP which issues a CTS request to forbid other station from transmitting. During this period, XR packets are sent between XR STA and XR AP.
Normally, AP beacons are broadcasted at 1 Mb rate since it's the lowest common denominator across all clients. When operating in XR mode, this is no longer the case. So, it might be needed for the AP to broadcast beacons at the 0.25 Mb rate as well.
Functional description ¶
To enable XR mode : iwpriv wlan0 xr 1
To disable XR mode : iwpriv wlan0 xr 0
Implementation description ¶
By reading the madwifi source code, it seems that the XR mode is implemented using a special VAP. Currently, madwifi is only supporting XR mode when operating as a STATION and not as an AP.
I Beleive they do now..... Can we Not ad an XR2 to our routerbaords, and it works?? I am using sr2 but plan on using Xr2.. And i have heard many times on this fourm of people using xr2 so im guessing they have chosen to support it. and if so thank YOU! -Jordnahttp://madwifi.org/wiki/ChipsetFeatures/XrMode
Introduction ¶
This document applies to the madwifi-ng source code. Conclusion provided here were based on the analysis of the source code revision r1531.
Theory of operation ¶
XR means "eXtended Range". This is a mode which extends the operational range of an AP by using lower and non standards rates : 0.25 Mb, 0.5 Mb, 1 Mb, 2 Mb, 3 Mb. It probably use the OFDM modulation as in 802.11g. Since it's a proprietary Atheros extension, several points needs to be taken care of :
XR mode only works between two devices having such capabilities. To know the capabilities of an AP, a special Information Element (IE XR) is contained in its beacon.
An AP might handle clients in XR mode and clients in non-XR mode. Since non-XR mode clients won't receive XR mode packet, we might have a hidden node problem. To avoid this situation, the XR mode seems to be a polled mode. The polling is probably initiated by the AP which issues a CTS request to forbid other station from transmitting. During this period, XR packets are sent between XR STA and XR AP.
Normally, AP beacons are broadcasted at 1 Mb rate since it's the lowest common denominator across all clients. When operating in XR mode, this is no longer the case. So, it might be needed for the AP to broadcast beacons at the 0.25 Mb rate as well.
Functional description ¶
To enable XR mode : iwpriv wlan0 xr 1
To disable XR mode : iwpriv wlan0 xr 0
Implementation description ¶
By reading the madwifi source code, it seems that the XR mode is implemented using a special VAP. Currently, madwifi is only supporting XR mode when operating as a STATION and not as an AP.
wish mikrotik can add support for XR!
Yes your right I was getting Xtream range , mixed up with eXtended range.... Does anybody have a link to this eXtended range, so i could get more information about it? Or i will google. Thanks -Jordanextended range is an Atheros modulation scheme that allows for very weak signal. Xtended Range 2, XR2, is a high powered mini PCI card.
I'd still love to have Atheros XR support. I've used it before on other devices and it lives up to the hype. Not that I'm planning on having links that bad, but as has been mentioned several times on the forum, when something goes wrong, noise, diversity chip blows, etc, its better to have slow internet than no internet. It gives a little time to figure out what happened.
I agree, I would much rather have a low connection than no connection at all, It has my vote to be supported... I will look up more on it later... ONe of my question would be is if this card is in the AP, does the same card have to be in the client. Like the 900mhz cards if you have an XR9 in the AP it has to be in the client aswell...You can get decent info at Atheros home page, don't have the addy off hand. I'm still on dial up until I get this rolled out, so google is more your friend than mine at this point.
The Atheros PR sounds like general PR fluff, but it actually works. I've used with signals as low as -106dB. Usually a 256K or so connection, maybe less, but slow is better than no.