Connect802 is a nationwide wireless data equipment reseller providing system design consulting, equipment configuration, and installation services.


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This is the last edition of the Wireless Connectivity Update newsletter. We're now on Twitter @Connect802

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Product Focus
Exploring the Connect802 value proposition...
Essential Wi-Fi
For those who are new to Wi-Fi networking...
Technology and Engineering
For the engineer and Wi-Fi network administrator...
To Infinity... and Beyond!
News from the wireless marketplace...

Product Focus

BridgeWave Gigabit Wireless Bridges

In past issues of the column, we have focused on bridges operating in the 2.4 and 5 GHz band, using 802.11 technologies. These bridges wring the most out of802.11, but even with 802.11n, there is a limit to the capacity they can provide. BridgeWave’s gigabit wireless bridges operate in the 60 GHz and 80 GHz frequency bands using custom modulation methods to provide gigabit speeds for a true alternative to fiber.

Please contact Connect802 Sales at 925.552.0802 to learn more about BridgeWave’s products. We look forward to hearing from you!

802.11’s Network Access Method: CSMA/CA

When two 802.11 devices transmit data at the same time, on the same channel, within range of each other, their data is likely to be corrupted. In this issue, you’ll learn about Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA), an algorithm in 802.11 that compensates for this occurrence.

Collectively, the behaviors described above are known as the Distributed Coordination Function (DCF). It can be a little confusing to hear the terms CSMA/CA and DCF both used. They are, functionally speaking, equivalent within the context of 802.11.


 Technology and Engineering

In “Essential Wi-Fi,” we discussed 802.11’s Distributed Coordination Function (DCF) and how it provides fair access to the medium while reducing the probability of collisions. But DCF is not the end of the story. In this article, we’ll discuss the other side of the coin, Point Coordination Function (PCF).

The advantage of PCF is that certain stations get guaranteed, priority access to the medium. A voice-over-IP phone, for example, could be configured to use point-coordination, meaning that it would be guaranteed to get to send its data every 2 nd or 3 rd beacon interval. Unfortunately, a disadvantage of PCF is that it’s an optional part of the 802.11 standard, and, to our knowledge, no manufacturer has ever implemented it in a production access point or client. For all of its potential benefits, it’s only of theoretical interest.

Wi-Fi, You and the Law

Some people argue that by leaving your Wi-Fi network open, you can deny responsibility for any illegal activity that occurred on the network. This defense has been used in P2P file sharing cases. Defenses like this have worked in a few cases , but it still seems better to simply prevent the illegal activity in the first place.

 

So long, and thank's for the fish!