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There are 43 articles & tutorials regarding "802.11".
- 7.) 802.11 Data Frames Revealed
- By Jim Geier Wireless LANs perform many functions, but the main idea is to move information from one point to another over an air medium. There are lots of networking protocols and physics that come into play to make this happen, but 802.11 data frames are responsible for getting the job done. Data Frame Basics An 802.11 data frame consists of a frame control field, address fields, frame body, and frame check sequence field. The frame control field has the same structure as other 802.11...
Found at Wi-Fi Planet
- 8.) EIRP Limitations for 802.11 WLANs
- By Jim Geier The spectrum regulatory body of each country restricts signal power levels of various frequencies to accommodate needs of users and avoid RF interference . Most countries deem 802.11 wireless LANs as license free. In order to qualify for license free operation, however, the radio devices must limit power levels to relatively low values. In many cases, installers would prefer to use comparatively high transmit power to increase the range of access points. The problem,...
Found at 802.11 PLANET
- 9.) Ending the 802.11 Network Card Power Drain
- By Jim Geier Wireless LANs certainly provide the freedom of mobility as we use our laptops and PDAs without the constraints of network cabling. Of course to facilitate this benefit, we unplug our devices from AC power and operate them from batteries. As most of know, however, 802.11 network cards consume significant amounts of energy that drains batteries fast. To prolong battery life, the 802.11 standard defines an optional "power save mode," which is available on most 80211 NICs...
Found at 802.11 PLANET
- 10.) 802.11 WEP: Concepts and Vulnerability
- By Jim Geier The security of a wireless LAN is very important, especially for applications hosting valuable information. For example, networks transmitting credit card numbers for verification or storing sensitive information are definitely candidates for emphasizing security. In these cases and others, proactively safeguard your network against security attacks. WEP (wired equivalent privacy) is 802.11's optional encryption standard implemented in the MAC Layer that most radio network...
Found at 802.11 PLANET
- 11.) Troubleshooting Your 802.11 WLAN
- By Jim Geier Last month we discussed how RF interference hinders the installation of wireless LANs, and we covered the use of site survey tools that help with deployments. Once you have the network installed, everything should continue to operate without any problems, right? Don't count on it! Unforeseen problems can drive you crazy Chances are that you'll eventually encounter troubles with an 802.11 deployment because of unplanned environmental changes (e.g., moved walls), utilization...
Found at 802.11 PLANET
- 12.) Minimizing 802.11 Interference Issues
- By Jim Geier RF interference is still plaguing wireless LAN deployments. Many companies have gotten by without any problems, but some have installations that don't operate as well as planned. The perils of interfering signals from external RF sources are often the culprit. As a result, it's important that you're fully aware of RF interference impact and avoidance techniques. What is the impact of RF interference? As a basis for understanding the impact of RF interference in wireless...
Found at 802.11 PLANET
More articles & tutorials (Index of all articles & tutorials)
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