Archive for the ‘wireless’ Tag
I ran across a nice Techworld article that talks about the need for wireless to be as fast, reliable,and scalable as wired Ethernet. Namely, because of the number of new wireless devices on the network that don’t *have* Ethernet ports. However, this article goes beyond BYOD and talks about management and policy for a single Unified Access layer (Wired, Wireless, and VPN), which I believe is a growing trend.
You can read the story here:
Here’s an inspiring video for you to start off your work week. 🙂
If you read my latest posts, you already know that I attended the Certified Wireless Analysis Professional beta course hosted by the CWNP program in Atlanta, GA last week.
I really enjoyed all the side bar discussions between attendees. There were at least 3-4 vendors represented, as well as VARs/Integrators and enterprise wireless network administrators. I spoke about my favorite side-bar discussion, which was about locating wireless devices through spectrum analysis on my Computerworld blog.
Attending the course also really reinforced what a big believer I am in the CWNP program. It’s great to see a vendor neutral training and certification body in our field. I really think that along with the IEEE and Wi-Fi Alliance, they have done a great job promoting and educating the community about wireless technology, which helps drive growth / adoption, which is good for everyone involved.
Therefore, I wanted to take the time to interview one of the CWNP co-founders, Kevin Sandlin, to have him explain about the program and how it fits an emerging trend in the marketplace:
I told you there was more to come on this one…
The project for the United States Tennis Association (USTA) was done in conjunction with a partner of ours, Signal Share. I can tell you, Signal Share is doing some exciting things in the wireless space.
The U.S. Open also had other arrays that were installed in a more permanent fashion. This is a picture of one such array taken from the perspective of where array in the first array was located.
It’s been awhile since I have done a “Super Tuesday” poll, so I thought I would throw one in today. You should answer this question for your primary computer, whether that be a desktop, a laptop, a tablet PC, or whatever.
I can’t give any “I voted” stickers away, but take satisfaction in the fact that you are shaping the (wireless) direction of America…. 🙂
I have one addition to the list:
- BlueAnt Supertooth Light – I can’t believe I excluded this one from the list because I actually *received* one of these as a Christmas gift this year. It’s a Bluetooth speakerphone/microphone that hangs on a car sun visor. And as Sheldon from the TV show, Big Bang Theory says, “Everything is better with Bluetooth”. I actually had a similar device from a different manufacturer and didn’t like it –mostly because it wasn’t loud enough. The call quality on both ends is excellent with the BlueAnt device.
I also wanted to expand on two of the original suggestions:
- PlayStation3 – The Wi-Fi on this does a lot more than I originally anticipated. Not only does it allow for free online game play, but it facilitates game updates. Once such example of this is in sports games where updated team rosters can be downloaded from online servers. You can also stream movies directly to the PS3 from NetFlix.
- Pet Rock – My Computerworld editor actually pointed out this reincarnation of the pet rock: http://www.thinkgeek.com/geektoys/cubegoodies/c208/ Oddly enough, this version of the pet rock *isn’t* wireless. Uhg…
One challenge for replacing desktop Ethernet with wireless is speed. Perhaps the widest publicized enhancement to 802.11n is that of MIMO (“my-moe”) antennas, which stands for “Multiple Input, Multiple Output”. How does MIMO work?
To answer that question, let’s look at how a classic 802.11 wireless transmitter operates:
In this case, the signal is sent out of one antenna. The signal is received by both antennas at the other end, but only one signal is processed and sent up to the MAC layer. Antenna diversity helps in the fact that the best signal is the one that is processed, but remember that it is still a single antenna that processes the receives and processes the RF energy.
Let’s compare that to a MIMO antenna structure:
In this case, we have three transmit antennas and three receive antennas (often referred to as 3×3 MIMO). The black, green, and red lines above each represent their own signal. With MIMO all three signals are received and processed up the stack. This significantly improves the receiver’s “ability to hear” and it represented in the graph above by the orange line.
You may hear different implementations of MIMO such as 2×3 and 3×3. The first number is the number of transmit antennas and the second number is the number of receive antennas. If you hear 3x3x2, the last number refers to the number of spatial streams, which I will discuss in another post.