Upcoming Events

Where the Cloud Touches Down: Simplifying Data Center Infrastructure Management

Thursday, July 25, 2013
10:00 AM PT/1:00 PM ET

In most data centers, DCIM rests on a shaky foundation of manual record keeping and scattered documentation. OpManager replaces data center documentation with a single repository for data, QRCodes for asset tracking, accurate 3D mapping of asset locations, and a configuration management database (CMDB). In this webcast, sponsored by ManageEngine, you will see how a real-world datacenter mapping stored in racktables gets imported into OpManager, which then provides a 3D visualization of where assets actually are. You'll also see how the QR Code generator helps you make the link between real assets and the monitoring world, and how the layered CMDB provides a single point of view for all your configuration data.

Register Now!

A Network Computing Webinar:
SDN First Steps

Thursday, August 8, 2013
11:00 AM PT / 2:00 PM ET

This webinar will help attendees understand the overall concept of SDN and its benefits, describe the different conceptual approaches to SDN, and examine the various technologies, both proprietary and open source, that are emerging. It will also help users decide whether SDN makes sense in their environment, and outline the first steps IT can take for testing SDN technologies.

Register Now!

More Events »

Subscribe to Newsletter

  • Keep up with all of the latest news and analysis on the fast-moving IT industry with Network Computing newsletters.
Sign Up

Crash Course: Wireless Site Surveys

AirMagnet and Ekahau, for instance, offer laptop-based tools for a walk-through site survey. AirMagnet's Survey PRO and Ekahau's Site Survey let you "visualize" your WLAN against your floor plan: You place an AP that's part of the site-survey kit in a desired location and then walk through the site with the tool. The tool records the path traversed, giving the software numerous points of reference so it can understand the propagation of the site-survey AP. The data is then used to develop an accurate visualization.

You can use these tools for outdoor WLANs as well. They integrate with a GPS receiver and use GPS coordinates as points of reference you can plot on the site map. These tools provide real signal-strength readings taken at specific locations rather than estimations based on statistical models.

They also collect data points such as nearby access points, received signal strength, AP performance, interference sources and spectrum analysis. And they use your existing Wi-Fi laptop card software and modify it for rapid channel scanning, so you're using the same WLAN NICs that provide your users access to the WLAN.

Once the walk-through is complete with the site survey AP at one location, the survey results are saved, and the AP is moved to a new location. Then, the walk-through process is repeated. These tools let you use a single site survey AP multiple times (it's configured to emulate multiple APs). Once you've gathered all measurements, you can use the tool in simulation mode and move APs around on the floor plan virtually. These simulations are helpful, but sometimes less accurate than those provided by RF modeling tools.

Note that estimation and prediction tools don't provide insight on how interference impacts WLAN performance, though they typically provide spectrum analysis, so you can sweep the site for interference. Spectrum analysis is a must for conducting a site survey for WLANs that require high availability or for congested, unlicensed Wi-Fi bands.


Page: « Previous Page | 1234 5 | 67  | Next Page »


Related Reading


More Insights


Network Computing encourages readers to engage in spirited, healthy debate, including taking us to task. However, Network Computing moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing/SPAM. Network Computing further reserves the right to disable the profile of any commenter participating in said activities.

 
Disqus Tips To upload an avatar photo, first complete your Disqus profile. | Please read our commenting policy.
 
Vendor Comparisons
Network Computing’s Vendor Comparisons provide extensive details on products and services, including downloadable feature matrices. Our categories include:

Research and Reports

Network Computing: April 2013



TechWeb Careers