What is Wireless Computer Networking?

Question: What is Wireless Computer Networking?

Answer: Wireless networks utilize radio waves and/or microwaves to maintain communication channels between computers. Wireless networking is a more modern alternative to wired networking that relies on copper and/or fiber optic cabling between network devices.

A wireless network offers advantages and disadvantages compared to a wired network. Advantages of wireless include mobility and elimination of unsightly cables. Disadvantages of wireless include the potential for radio interference due to weather, other wireless devices, or obstructions like walls.

Wireless is rapidly gaining in popularity for both home and business networking. Wireless technology continues to improve, and the cost of wireless products continues to decrease. Popular wireless local area networking (WLAN) products conform to the 802.11 "Wi-Fi" standards. The gear a person needs to build wireless networks includes network adapters (NICs), access points (APs), and routers.

Networking for Today

you use a computer a lot, then you’re like me and probably have your hand on your mouse all day long. Click, click, click, drag, drop, click, and click all day long. God forbid if your mouse (and/or touch pad) stops working. Then what? Now what do I do? Well, believe it or not, but everything you do with your mouse can be done with the keyboard.

Most computer users know they can use their keyboard instead of the mouse but they’re not exactly sure what short-cut keystrokes do what. So, let me give you a list of the most common keyboard short-cuts and explain what each does. You’ll be amazed at how little time it’ll take you to start getting use to using the keyboard short-cuts over clicking on a menu item with the mouse. There are three keys on the keyboard that are used specifically for keyboard short-cuts. These are the “Ctrl” (Control), “Alt” (Alternate) and “Shift” (For Capital Letters). All three should be available on either side of your keyboard.

The Basics – CUT COPY PASTE

Every computer user should know how to CUT, COPY and PASTE. This is the ability to move or duplicate anything...text, images, whatever, from one spot or program to another. Typically a user will select an item, right mouse click to display a short-cut menu, and then choose to Copy or Paste. The same can be done with the keyboard. With the item selected, press either “Ctrl” plus “X” to CUT (Move) or “Ctrl” plus “C” to COPY. Once you’ve CUT or COPY then place your cursor in the receiving location and press “Ctrl” plus “V” for PASTE. Just as a note, when pressing multiple key combinations, always press the “Ctrl,” “Alt” or “Shift” key first, hold it down then press the second key. That’s it! Simple! If you’re copying the same information in multiple spots you don’t have to repeat the CUT or COPY step, just repeat the PASTE step in each new location.

PtP wireless link restarting on overloads

Asked by Ramin-Samadi on 9/24/2009 4:10 PM

Hi,
I've a PtP (Teletronics 5826 on both sides) link in a distance of 20KM. Everything is fine when there is no usage on the links or the internet is down. But when the internet goes up or they're downloading some files, the access point will start restarting everyminute and the ping latency will go up.
I have 3Mb internet in this link.
Just to add one more thing, when i'm enabling QoS and limiting the bandwidth on 1.5Mb download speed the link goes stable but with a little high ping latency.
What do I do?
Sorry for my bad english!
Thanks in Advance!

वहत इस सेंसर networking

In December 2004, the OSU DARPA-NEST team headed by Anish Arora completed the first demonstration and experiments of ExScal. This demonstration covered an area 1.3km by 300m with about 1000 sensor nodes and around 200 backbone nodes making it the largest wireless sensor network assembled to date. ExScal's demonstration is also the largest ad hoc 802.11 network thus far created.

It is widely believed that someday there will be sensor network deployments of hundreds of thousands of nodes. The challenges in scaling to networks of this size are quite different than the ones encountered in fielding much smaller networks of dozens or hundreds of nodes. The former subsumes the latter and add a host of new problems. The motivation for the DARPA Extreme Scaling project, code-named "ExScal," was to investigate the challenges in scaling to a network of 10,000 sensor nodes. While 10,000 nodes is still a fraction of "hundreds of thousands," we have encountered many of the basic challenges of extreme scaling that we believe will be encountered with larger numbers of nodes. Consequently, the ExScal project has provided us with a rich set of experiences and has given us a visceral understanding of the "real" problems that are posed by networks of extreme scale.

Networking

Deborah Estrin is a Professor of Computer Science with a joint appointment in Electrical Engineering at UCLA, holds the Jon Postel Chair in Computer Networks, and is Founding Director of the NSF-funded Center for Embedded Networked Sensing (CENS). Estrin received her Ph.D. (1985) in Computer Science from the Massachusetts Institute of Technology, and her B.S. (1980) from U.C. Berkeley. Before joining UCLA she was a member of the University of Southern California, Computer Science Department.

In 1987, Professor Estrin received the National Science Foundation, Presidential Young Investigator Award for her research in network interconnection and security. During the subsequent 10 years much of her research focused on the design of network and routing protocols for very large, global, networks, such as: scalable multicast routing and transport protocols, self-configuring protocol mechanisms for scalability and robustness, and tools and methods for designing and studying large scale networks.

Since the late 90's Professor Estrin has focused on embedded networked sensing systems, with a particular focus on applications to environmental monitoring. Most recently this work includes mobile personal sensing systems, leveraging the location, acoustic, image, and attached-sensor data streams increasingly available globally from mobile phones. Ongoing projects include Personal Environmental Impact Report, Participatory Sensing campaigns for communities, and self--monitoring applications in support of health and wellness (http://urban.cens.ucla.edu, http://peir.cens.ucla.edu).

Estrin has been a co-PI on many NSF and DARPA funded projects and has been an active participant in numerous government sponsored studies. She chaired a 1997-98 ISAT study on sensor networks, and the 2001 NRC study on Networked Embedded Computing which produced the report Embedded Everywhere. She later chaired the Sensors and Sensor Networks subcommittee of the NEON Network Design Committee (http://neoninc.org). Estrin also served on the Advisory Committees for the NSF Computer and Information Science and Engineering (CISE) and Environmental Research and Education (ERE) Directorates, and is currently a member of the Computer Science and Telecommunications Board (CSTB) of The National Research Council (NRC).

Estrin has also served as an editor for the ACM/IEEE Transactions on Networks, and as a program committee member for many networking related conferences, including Sigcomm and Infocom. She was Steering Group Chair and General Co-Chair for the first ACM Conference on Embedded Networked Sensor Systems, Sensys 2003, and served as one of the first Associate Editors for the ACM Transactions on Sensor Networks.

Estrin is a fellow of the ACM, AAAS and the IEEE. She was selected as the first ACM-W Athena Lecturer in 2006, was awarded the Anita Borg Institute's Women of Vision Award for Innovation in 2007, inducted into the WITI hall of fame in 2008, and awarded Doctor Honoris Causa from EPFL in 2008. Professor Estrin was elected to the American Academy of Arts and Sciences in 2007 and into the National Academy of Engineering in 2009.

webmaster at cens.ucla.edu