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Written by Devin Akin
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Monday, 20 August 2007 |
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Having just written a whitepaper on Fast BSS Transition, I decided to look into the nuances of configuring supplicants for Opportunistic PMK Caching (OPC). Holy smokes batman - what a pain it is to find documentation on this. Microsoft says that OPC is supported when you have the KB893357 update loaded: http://support.microsoft.com/kb/893357 |
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Written by Devin Akin
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Friday, 17 August 2007 |
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The 802.11n draft gives us 20 and 40 MHz wide channels. This is no secret and has been widely publicized for months. What hasn't been publicized is how 40 MHz channels work. The draft explains the concepts of "primary" and "secondary" channels - each 20 MHz wide using OFDM modulation. A Secondary Channel is defined as a 20 MHz channel associated with a primary channel used by HT stations for the purpose of creating a 40 MHz channel. |
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Written by Devin Akin
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Thursday, 16 August 2007 |
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I was a little perturbed at 802.11n when I first started testing it, and now, after discovering the truth, I'm just saddened. |
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Written by Devin Akin
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Wednesday, 15 August 2007 |
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RIFS (Reduced Interframe Spacing) is a means of reducing overhead and thereby increasing network efficiency. RIFS may be used in place of SIFS to separate multiple HT format transmissions from a single transmitter when no SIFS-separated response transmission (like an ACK) is expected. The RIFS is the time from the end of the last symbol of the previous frame to the beginning of the first symbol of the preamble of the subsequent frame as seen at the air interface. The value of RIFS for the MIMO PHY is 2us. |
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Written by Devin Akin
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Tuesday, 14 August 2007 |
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You hear all the time about how 802.11n is going to change everything - especially the design infrastructure. I thought I'd ramble about that a bit. |
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Written by Devin Akin
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Monday, 13 August 2007 |
Dual CTS bit in the HT IE:
When this feature is used, beacons in a BSS have the "Dual CTS Protection subfield" set to 1. Stations will then start every TXOP with an RTS frame addressed to the AP. The AP responds to this RTS with two CTS frames. If the RTS is an STBC frame, then the first CTS is an STBC frame back to the station and the second CTS is a non-STBC frame back to the station. This assures that all STBC and non-STBC stations receive the CTS and set their NAVs accordingly. NAVs are set to cover the entire transmission process (as always), including both CTS transmissions (which is new). |
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WEP crack again, 
