Email Delivery

Receive new posts as email.

Email address

Syndicate this site

RSS | Atom


About This Site
Contact Us
Privacy Policy


November 2010
Sun Mon Tues Wed Thurs Fri Sat
  1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30        

Stories by Category

Basics :: Basics
Casting :: Casting Listen In Podcasts Videocasts
Culture :: Culture Hacking
Deals :: Deals
Future :: Future
Hardware :: Hardware Adapters Appliances Chips Consumer Electronics Gaming Home Entertainment Music Photography Video Gadgets Mesh Monitoring and Testing PDAs Phones Smartphones
Industry :: Industry Conferences Financial Free Health Legal Research Vendor analysis
International :: International
Media :: Media Locally cached Streaming
Metro-Scale Networks :: Metro-Scale Networks Community Networking Municipal
Network Types :: Network Types Broadband Wireless Cellular 2.5G and 3G 4G Power Line Satellite
News :: News Mainstream Media
Politics :: Politics Regulation Sock Puppets
Schedules :: Schedules
Security :: Security 802.1X
Site Specific :: Site Specific Administrative Detail April Fool's Blogging Book review Cluelessness Guest Commentary History Humor Self-Promotion Unique Wee-Fi Who's Hot Today?
Software :: Software Open Source
Spectrum :: Spectrum 60 GHz
Standards :: Standards 802.11a 802.11ac 802.11ad 802.11e 802.11g 802.11n 802.20 Bluetooth MIMO UWB WiGig WiMAX ZigBee
Transportation and Lodging :: Transportation and Lodging Air Travel Aquatic Commuting Hotels Rails
Unclassified :: Unclassified
Vertical Markets :: Vertical Markets Academia Enterprise WLAN Switches Home Hot Spot Aggregators Hot Spot Advertising Road Warrior Roaming Libraries Location Medical Public Safety Residential Rural SOHO Small-Medium Sized Business Universities Utilities wISP
Voice :: Voice


November 2010 | October 2010 | September 2010 | August 2010 | July 2010 | June 2010 | May 2010 | April 2010 | March 2010 | February 2010 | January 2010 | December 2009 | November 2009 | October 2009 | September 2009 | August 2009 | July 2009 | June 2009 | May 2009 | April 2009 | March 2009 | February 2009 | January 2009 | December 2008 | November 2008 | October 2008 | September 2008 | August 2008 | July 2008 | June 2008 | May 2008 | April 2008 | March 2008 | February 2008 | January 2008 | December 2007 | November 2007 | October 2007 | September 2007 | August 2007 | July 2007 | June 2007 | May 2007 | April 2007 | March 2007 | February 2007 | January 2007 | December 2006 | November 2006 | October 2006 | September 2006 | August 2006 | July 2006 | June 2006 | May 2006 | April 2006 | March 2006 | February 2006 | January 2006 | December 2005 | November 2005 | October 2005 | September 2005 | August 2005 | July 2005 | June 2005 | May 2005 | April 2005 | March 2005 | February 2005 | January 2005 | December 2004 | November 2004 | October 2004 | September 2004 | August 2004 | July 2004 | June 2004 | May 2004 | April 2004 | March 2004 | February 2004 | January 2004 | December 2003 | November 2003 | October 2003 | September 2003 | August 2003 | July 2003 | June 2003 | May 2003 | April 2003 | March 2003 | February 2003 | January 2003 | December 2002 | November 2002 | October 2002 | September 2002 | August 2002 | July 2002 | June 2002 | May 2002 | April 2002 | March 2002 | February 2002 | January 2002 | December 2001 | November 2001 | October 2001 | September 2001 | August 2001 | July 2001 | June 2001 | May 2001 | April 2001 |

Recent Entries

In-Flight Wi-Fi and In-Flight Bombs
Can WPA Protect against Firesheep on Same Network?
Southwest Sets In-Flight Wi-Fi at $5
Eye-Fi Adds a View for Web Access
Firesheep Makes Sidejacking Easy
Wi-Fi Direct Certification Starts
Decaf on the Starbucks Digital Network
Google Did Snag Passwords
WiMax and LTE Not Technically 4G by ITU Standards
AT&T Wi-Fi Connections Keep High Growth with Free Service

Site Philosophy

This site operates as an independent editorial operation. Advertising, sponsorships, and other non-editorial materials represent the opinions and messages of their respective origins, and not of the site operator. Part of the FM Tech advertising network.


Entire site and all contents except otherwise noted © Copyright 2001-2010 by Glenn Fleishman. Some images ©2006 Jupiterimages Corporation. All rights reserved. Please contact us for reprint rights. Linking is, of course, free and encouraged.

Powered by
Movable Type

« Cell Industry High Fives Wi-Fi at Conference | Main | Siriusly Twisted »

March 15, 2002

The Death of Wi-Fi?

Satellite Radio Company Tries to Kill Wi-Fi reports on a potential FCC ruling limiting 2.4 GHz radiated signal: this is the most frightening development to hit Wi-Fi in its history. If the attempt by satellite radio firm Sirius succeeds, public space, wISP, and community Wi-Fi could suffer crushing blows.

Concourse Launches First Airport

The big news of the day (until the above story came in), as I break in today's New York Times (3rd item), is that Concourse Communications launches its Minneapolis/St. Paul International Airport (MSP) service on March 20. Concourse's approach is to not deal with the back-office at all. They're a pure infrastructure company which is contracting with airport authorities, negotiating the intricacies of that world, handling contractors for installation, and letting iPass resell access to their system.

The MSP airport will have about 70 percent coverage initially, increasing rapidly to near 100 percent service. The installation includes Bluetooth access point and printer stations. The first 30 days after the network is lit will be free. Afterwards, service is through iPass, an iPass partner or affiliate (which could include other aggregators), or at a walk-up rate of $7.95 per 24 hours, which is rapidly becoming the de facto day rate.

Concourse has the contract for the New York metro airports (Newark, Kenndy, and LaGuardia), and has already wired two terminals at Newark and Kennedy. The Port Authority of New York and New Jersey suffered huge losses in the World Trade Center attack, as it many of the administrative staff worked out of the towers, which were in fact built by and leased out by the Port Authority. Their personal and professional losses coupled with the downturn in air traffic and increased security all led to delays in Concourse's deployment.

Concourse expects to offer some limited service by mid-year in Newark and Kennedy and expand based on their experience in MSP.

Other News

DoCoMo to launch Wi-Fi trial: integrated billing might be an incentive for use.

Mapping the generous world: mapping overlays of free network points in various community networks via NYCWireless. Includes NYC, San Francisco, Seattle, and more. [Via Kottke through]

Philips and Viewsonic introduce separate Wi-Fi displays: the Philips unit (press release in German) is detachable from a base station; Viewsonics is entirely independent and can be used like a tablet PC.

The Register reports that Britain and the Netherlands will be able to use 802.11a devices by July: the first in a wave of approvals for unlicensed 5 GHz devices using 802.11a in Europe, albeit over a smaller set of channels than available in the U.S. (But still more clear, nonoverlapping domains than 802.11b.)

Extremely technical, but precise overview of the challenges facing 802.11g finalization and rollout: mixed 802.11b and g networks could reduce overall throughput to only slightly above solo 802.11b networks because, as the author puts it, the data from b radios reduces the amount of time available for g encoding, which reduces overall throughput.

Several days ago, the Austrian wISP Metronet started service in Vienna: they assert that they are the first public WLAN company in Europe (disputation, anyone?). The network has about 40 access points with another 100 coming online shortly. Service extends to Graz and Linz soon. (Es ist sehr interessant, dass auf der Site so viel Englisch gebraucht wird! Englisch muss noch für Technologie wie Boxing und Sport die "mot juste" haben.)

Phillipe Langlois wrote in to announce a new wireless security list: Discussion in this group relates to wireless security, wardriving, GSM networks, GPRS, 802.11b and .11a security, WEP, hiperlan2, spread spectrum, WAP, bluetooth, UMTS and 3G, UWB. This list is created in the spirit of BugTraq to provide a forum for full disclosure on wireless security. Phillipe also runs a firm that makes security products, WaveSecurity. Subscribe at or visit the archives and/or subscribe.

Let's talk about throughput

Lots of fellow reporters and Web site bloggers have been using throughput to mean maximum speed (in the sense of maximum theoretical throughput). But that falls far from the mark: users care about real throughput, or the net Net speed they can see in day-to-day use.

The IEEE defines throughput broadly as, the amount of work that can be performed by a computer system or component in a given period of time. The U.S. government's telecommunications glossary more exactly defines it in terms of bandwidth: The number of bits, characters, or blocks passing through a data communication system, or portion of that system....Throughput may vary greatly from its theoretical maximum.

The 802.11a spec may have a maximum raw bandwidth of 54 Mbps, but a practical throughput of as low as 23 Mbps, according to reports. So let's be exact: when you're talking about the potential of a system, it's fine to use the theoretical maximum number of bits; but when you're talking about the realities, you must subtract overhead (framing, addressing, etc.), error correction, and other bits that don't contain actual data in transmission.

(I'm not even going to start on latency: this two-part, four-year-old article says it all.)