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January 8, 2007
Apple to call 802.11n WiFi Airport Extreme X2 and X4
It's surprising that no one has found this yet. This is taken directly from the course description for Apple's WiFi session at Macworld this year: "Wireless networking is about to undergo major changes, with 802.11n, or Airport Extreme X2 and X4. Starting with the basics of wireless networks, we will show how to design, deploy and test wireless..."
Posted by Jason D. O'Grady at January 8, 2007 4:41 PM
Category: Wireless
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Comments
Based on a quick read of this,
http://www.oreilly.com/catalog/802do...apter/ch15.pdf
it seems that the X2 and X4 monikers refer to whether the channels are 20 MHz (legacy 802.11) or 40 MHz wide. There are two main draft approaches to 802.11n: WWiSE or TGnSync. Although Apple may not be taking sides yet, I'd guess they are with the TGnSync camp, as this group is pushing for the use of 802.11n as a way to stream HDTV or DVD content. Also, Intel is part of this consortium.
Anyhow, with 20 MHz channels both drafts achieve top speeds around 135/140 Mbps, which is a little over 2X the speed of 802.11g (54 Mbps, ignoring the turbo stuff). However, if the channels are 40 MHz wide, then bandwidth effectively doubles and top speeds are up around 270/315 Mbps. 270/135 = 2, justifying the X4 moniker.
Hmm..so I guess you are wrong...but at least you spelled Macworld right.
Posted by: J at January 8, 2007 5:56 PM
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