802.11g
802.11g
In June 2003, a third modulation standard was ratified: 802.11g. This flavour works in the 2.4 GHz band (like 802.11b) but operates at a maximum raw data rate of 54 Mbit/s, or about 24.7 Mbit/s net throughput like 802.11a. 802.11g hardware will work with 802.11b hardware. Details of making b and g work well together occupied much of the lingering technical process. In older networks, however, the presence of an 802.11b participant significantly reduces the speed of an 802.11g network. The modulation scheme used in 802.11g is orthogonal frequency-division multiplexing (OFDM) for the data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s, and reverts to (like the 802.11b standard) CCK for 5.5 and 11 Mbit/s and DBPSK/DQPSK+DSSS for 1 and 2 Mbit/s. Even though 802.11g operates in the same frequency band as 802.11b, it can achieve higher data rates because of its similarities to 802.11a.
While 802.11g held the promise of higher throughput, actual results were degraded by a number of factors: conflict with 802.11b-only devices (see above), exposure to the same interference sources as 802.11b, limited channelization (only 3 fully non-overlapping channels like 802.11b) and the fact that the higher data rates of 802.11g are often more susceptible to interference than 802.11b, causing the 802.11g device to reduce the data rate to effectively the same rates used by 802.11b. The move to dual-mode/tri-mode products also carries with it economies of scale (e.g. single chip manufacturing). For the consumer, dual-band/tri-mode products ensure the best possible throughput in any given environment.
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802.11g Related Products
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802.11g Related Product Families
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802.11g Related Industry News
Alliance to certify Wi-Fi security specs HANOVER, GERMANY -- The Wi-Fi Alliance expects to certify by May its WPA (Wi-Fi Protected Access) set of specifications in the first of several efforts to provide greater security to users of high-speed wireless networks, said Andrea Vocale, a technical expert with the alliance, speaking Monday at a news conference at the CeBIT trade show here.
WPA is a subset of the 802.11i security standard, which has yet to be approved by the IEEE ( Institute of El......
[more] Getting a grip on WLAN futures The wireless LAN world is a pretty bad offender when it comes to Alphabet Soup, what with 802.11b preceding 802.11a, and neither being the same type of thing as 802.11e*. So it was useful to hear Jan Haagh, a senior product manager in Proxim's WLAN division, talk through some of latest acronyms.
One to watch out for is WPA, or WiFi Protected Access. This will replace the original WEP wireless security standard, which turned out to be not very secure after all.......
[more] The Wireless-Security Balancing Act If you choose an EAP that doesn't gain de facto standard status, the access point will be to other EAP clients what a two-hole electrical outlet is to three-pronged plugs. Wireless LANs have been billed as the great security wasteland. But thanks to the 802.11b Wi-Fi community's frenetic activity in the last year, an abundance of good security choices now exist, with more on the way.
Wi-Fi security efforts have focused on encryption and authentication, wi......
[more] City sees the benefits of wireless networks Survey shows more businesses are convinced but security is still lax The third annual Wireless Security Survey of London has highlighted a significant increase in the use of wireless networks by businesses.
In the two years since the survey was first undertaken, the number of wireless networks used in the City has increased from 124 in 2001, to 328 in 2002 and 1078 in 2003.
The benefits of the technology appear to have convinced companies, and th......
[more] Opportunities for Wi-Fi hackers on the increase London home to rogue access points IT managers are catching up to the dangers of Wi-Fi, but opportunities for drive-by hackers in London may actually be increasing. New wireless LANs are popping up very fast, and many of them are insecure 'rogue' access points.
This year, only two-thirds of the City's Wi-Fi networks have WEP (wired equivalent privacy), the basic Wi-Fi security standard turned on. That's not a great record, but it is better than l......
[more] A quarter of products fail Wi-Fi tests More than a quarter of Wi-Fi products fail compatibility tests the first time, according to the Wi-Fi Alliance, the body that promotes Wi-Fi use. Most users find that Wi-Fi devices work the first time with any hotspot, however, because the problems are always fixed before the product earns the Wi-Fi badge -- the 1000th of which has now been issued by the Alliance.
"Based on testing of more than 1,000 products over several IEEE (Institute of Electrical......
[more] THE A to Z of wireless terms and technologies Everything you need to know about Wireless Jargon 802.11a
54Mbps wireless Ethernet operating in the 5GHz band.
802.11b
The industry standard 11Mbps wireless Ethernet operating at 2.4GHz.
802.11e
Defines quality-of-service for wireless local area networks, to support voice-over IP for example.
802.11g
Successor to 802.11b, providing up to 54Mbps over the same 2.4GHz spectrum used by 802.11b.
802.11h
A supplement to 802.11a to ensure t......
[more] Security group warns of flaw in wireless protocol The Australian Computer Emergency Response Team issued an advisory Thursday warning companies that their wireless networks could be disrupted by an attacker with a handheld device. A vulnerability in the most common wireless networking protocol, the 802.11 standard established by the Institute of Electrical and Electronic Engineers (IEEE), allows a device to essentially jam other devices on a network using a low-power signal.
"Previously, at......
[more] Is 802.11a like Betamax? Is 802.11a the Betamax vs. VHS of wireless networking? Betamax was technically better. Why haven't companies adopted 802.11a? We don’t believe that 802.11a will prove analogous to Betamax. The 802.11a radio spec provides a number of advantages over 802.11b for businesses, which more time and usage will make obvious.
At first glance, 802.11g seems to provide a similar performance improvement to 802.11a, with 54M bit/sec as the often-quoted maximum data rate, and the a......
[more] IT managers ready defenses against flaw in wireless LANs Users could face DoS attacks, but the risks are seen as low Information technology managers last week said a denial-of-service vulnerability that affects some Wi-Fi wireless LANs could force companies to develop new skills and rethink the way their networks are set up. But, they added, it should be relatively easy to defend WLANs against attacks seeking to exploit the flaw.
For example, an attacker would need to be within the typical 20......
[more] High-speed wireless begins its standardisation journey The Institute of Electrical and Electronics Engineers (IEEE) will begin sifting through a record number of proposals for a high-speed amendment to the 802.11 standard next week, but wireless chip makers are already jumping the gun with pre-standard products.
802.11n is intended to more than triple the real throughput of wireless LAN (WLAN) by focussing on enhancements to the MAC (media access control) interface, rather than the physical l......
[more] Security concerns still plague wireless take-up Wireless has many benefits, provided companies minimise the risks and rein in ad hoc networks 'Be afraid, be very afraid' is the attitude of many companies when faced with the prospect of using a wireless network.
Because wireless is about broadcasting data that often goes beyond company perimeters, businesses worry that it won't be secure enough. And who can blame them, with a regular stream of surveys highlighting gaping security holes?
Secur......
[more] Intel formally introduces tri-mode Wi-Fi chip Processor supports 802.11a, b and g As expected, Intel introduced its tri-mode wireless chip Thursday with several software enhancements to the product to help improve security and reliability, it said during a Webcast.
The Intel Pro/Wireless 2915ABG Network Connection allows laptops based on Intel's Centrino platform to connect to the three most commonly used wireless networks found in enterprises and homes. The first notebooks with the chip will b......
[more] First Wi-Fi products get security certificate The Wi-Fi Alliance got its next certification programme off to a flying start, issuing WPA2 badges to a bunch of products that comply with the 802.11i security specification. The Alliance is readying other programmes for quality of service and the 802.11n fast Wi-Fi standard due next year.
The WPA2 certified products include generic designs from Atheros Communications and Broadcom, so customers can expect to buy products with the badges on by the en......
[more] Wi-Fi group says 'no' to pre-standard 802.11n kit The Wi-Fi Alliance (WFA) today formally avowed its aversion to so-called 'pre-standard' wireless products by pledging not to certify kit featuring 802.11n technologies until the standard has been ratified by the IEEE.
That's not expected to take place until November 2006, but if past versions of Wi-Fi are anything to go by, a number of WLAN chip makers and equipment makers will undoubtedly try to beat the rest to market by offering products tha......
[more] Wireless-J standard opens Japan to the Wi-Fi world And boost 802.11a at the same time. The Institute of Electrical and Electronics Engineers (IEEE) has approved a new wireless standard that will expand international Wi-Fi roaming to Japan.
The 802.11j standard will also apply to wireless equipment used by US anti-terrorism forces, and will affect the way spectrum is used in other countries.
It brings the 802.11 WLAN family - branded Wi-Fi - into line with Japanese regulations from August of 2......
[more] Access all areas Doubts about security have long discouraged many firms from deploying mobile computing. But wireless technology has moved on When many companies find it hard enough to control the IT use of office-based employees, how do you convince them that giving staff remote access is a good idea?
This is the dilemma that faces all notebook, wireless networking and remote-management software manufacturers and resellers. There are a lot of variables to consider. The process of providing a m......
[more] World is going WiFi - fast Maybe it should be called the World Wireless Web. There are now more than 50,000 WiFi hotspots around the globe, with London leading the pack with more than 1,100 hotspots, according to JiWire.com.
Hotspots are physical locations where wireless connections to the Internet are offered. JiWire.com is a San Francisco company that monitors WiFi locations and offers a searchable database of hotspots on the Web.
The company recently issued a report tracking the world's t......
[more] Motorola Merges Its Plan for Faster Wi-Fi Two camps are ready for a showdown over faster wireless LANs following Motorola's agreement last week to merge its proposal for the IEEE 802.11n standard with that of the World Wide Spectrum Efficiency (WWiSE) consortium.
There are two remaining proposals for the 802.11n standard, which calls for wireless LANs that offer more than 100 megabits per second of data throughput. A task group of the Institute of Electrical and Electronics Engineers is set to......
[more] London gets a mile of free Wi-Fi Good news for wireless users in Islington - they can now get free wireless Internet access. But will commercial hot spot operators be pleased? Mobile workers in London will be able to get free wireless access across a mile-long swathe of the capital, via a Wi-Fi network financed by Islington Council.
Dubbed the 'Technology Mile', it is thought to be the largest free public-access wireless network built in the UK so far. Islington Council took the decision to fu......
[more] CyberGuard launches wireless security appliance for SMEs CyberGuard Corporation has announced a new all-in-one wireless workgroup security and data access appliance, the CyberGuard SG565, designed to secure the wireless and wired local area networks of small and medium-sized enterprises.
Unifying defences to combat blended threats via a single device combining firewall, intrusion prevention and gateway anti-virus is quickly becoming a requirement for small and medium-sized businesses. CyberGua......
[more] Wi-Fi standard impasse makes 802.11n merger likely The leaders of the rival proposals for faster Wi-Fi are expected to meet face to face next week, to discuss a truce following the failure of IEEE's 802.11n task group to reach an agreement.
"The IEEE .11n ballot was a good result," said Dave Borison, director of product marketing at Airgo Networks Inc. "It's a wake-up call for both camps. We want to move forward and get a standard in place. Within the next quarter, or two at the most, we will......
[more] 802.11n supercharges Wi-Fi The forthcoming 802.11n standard will increase the capabilities of Wi-Fi kit The Institute of Electrical and Electronics Engineers (IEEE), based in the US and not to be confused with our own Institution of Electrical Engineers (IEE), creates standards for various aspects of electronics. The best-known standards in the IT field are those written by committee 802, which include the standards for Ethernet, other LAN access methods and LAN security. However, 802 is now mos......
[more] AirMagnet Announces Laptop-Based Wi-Fi Spectrum Analyzer AirMagnet, the leader in WLAN security and performance solutions, today announced a new laptop-based RF spectrum analysis solution for Wi-Fi networks. The AirMagnet Spectrum Analyzer -- based on Cognio's patented Intelligent Spectrum Management System -- is the industry's first to identify the specific sources of interference that can undermine the performance of wireless networks.
The AirMagnet Spectrum Analyzer complements AirMagnet L......
[more] Wireless Noise Hampers DefCon A team of wireless security and performance specialists from AirMagnet today
reported their findings after spending the weekend monitoring wireless network
traffic at DefCon, the self-described "convention for underground hackers." A
representative from the AirMagnet group noted with some surprise that RF
interference from non-Wi-Fi devices seemed to pose the greatest threat to the
conference's wireless networks.
"The wireless attacks we saw--jamming,
de-au......
[more] Your SSID Isn’t Hidden Forever A common security practice among wireless network administrators is to disable Service Set Identifier (SSID) broadcasting on wireless access points or routers. The reason is that disabling SSID broadcasting is supposed to hide and protect their wireless network. Even if an individual knows there is a wireless network at a certain location, this person must know the SSID to establish a connection with the network.
Therefore, hiding the SSID by disabling SSID broa......
[more] Wi-fi: Coming soon on board U.S. airplanes Air travelers starved for in-flight Internet access may soon find solace, thanks to a Colorado company that wants to offer Wi-fi service aloft. AirCell said Monday that it plans to use a newly acquired radio spectrum license to offer "affordable" broadband service aboard commercial airplanes. Formed in 1991, the company already sells satellite-based voice and data services to the general aviation sector, primarily the corporate jet set. In th......
[more] IEEE 802.11n Wireless LAN to Grab 20% of Market in 2007 Market research firm In-Stat believes that even though several companies initiated shipments of equipment compatible with draft 802.11n wireless local area networks (WLAN) standard, the market will shift to the new standard at a much slower pace compared to the transition to 802.11g."Buyers of these Draft n products are early adopters willing to pay two to three times the price of standard 802.11g products. In-Stat expects the transit......
[more] 10 things you should know before you buy an 802.11n wireless device If you've spent any time in your local tech shop, you are sure to have seen a rash of Pre-N and Draft-N wireless products. Before you get caught up in a rush of new product frenzy and plunk your money down, take a few minutes and look at exactly what you are buying.MIMOOne of the big advantages of 802.11n is MIMO. MIMO is short for Multiple Input / Multiple Output. MIMO breaks the data transmission down to multiple parts that a......
[more] Fast Wi-Fi standard ready for vote A completed draft of the 802.11n fast Wi-Fi standard could be ready to vote on this week - signalling greater acceptance and a flood of products later this year. The IEEE fast Wi-Fi standard, which will operate at up to 200 Mbit/s, is expected to take a significant step closer to reality this week, when the Task Group N in the IEEE's 802.11 LAN Working Group completes a draft which can be voted on, according to Glenn Fleishman of Wi-Fi Net News. "The IEEE......
[more] Apple to charge for faster Wi-Fi Some MacBook Pro and MacBook customers have the faster 802.11n Wi-Fi chip already sitting in their systems, but it will cost $2 to light it up. Apple on Thursday confirmed reports that it plans to charge customers a fee to download software that will enable the 802.11n capability in the Wi-Fi chips found in some MacBook and MacBook Pro systems. But it won't cost $5, as many reports indicated. It will cost $1.99, and will be available on Apple's Web site, said Ly......
[more] Business Internet Users Go Wireless According to a new Pew Internet & American Life Project study, one-third of Internet users have used a wireless connection around the house, at their workplace, or some place else. Analysts expect that group to grow in Corporate America in the coming years as Wi-Fi security gets stronger and coverage range improves. Users who access Internet-based e-mail and search the Web from their BlackBerries or other mobile PDAs were among those who responded to the......
[more] Wireless security: Balancing act Organisations need to weigh the convenience of wireless networking against the risks to the integrity of their IT systems. Steve Gold reports.A quick glance around any high-street IT store will reveal that wireless networking - commonly referred to as WiFi - has taken off in a big way. It's now possible to buy a data-accelerated 802.11g WiFi-enabled broadband router for around £50.Suddenly it's possible for an employee of even smaller firms to go out and b......
[more] Wireless security 2007 Unraveling the confusion about wireless standards is no mean feat. Justin Peltier takes a look at the latest crop of products in the field of wireless security management.Wireless networks are not about to go away any time soon. The convenience of losing the copper tether and gaining the ability to roam from one end of a campus to another without re-authenticating is just too practical. In the earlier days of wireless networks, the security controls were riddled with flaw......
[more] "Certified" fast Wi-Fi could still hurt today's nets The Wi-Fi Alliance is issuing brands for fast "Draft N" equipment, but it is not testing the most controversial part of the specifications - whether the new Wi-Fi kit will cripple existing 802.11g networks. The Draft N brand, launched last month, tests basic functions, but specifically does not test features that can block today's Wi-Fi systems. D-Link, Netgear and Linksys have all received branding, but users cannot be sure whether......
[more] River Thames gets free Wi-Fi The river Thames is to get a free Wi-Fi network after two companies, namely free-hotspot.com and MeshHopper partnered up to launch what they claim is Europe's largest free metropolitian Wi-Fi network. The 802.11g mesh network, offically known as "online-4-free.com", is situated along a 22 kilometre stretch of the Thames from Millbank to Greenwich, although this will be expanded to 36 kilometres in August. The network is administed and run by MeshHop......
[more] Is 802.11n ready for the enterprise? The latest draft of the 802.11n wireless LAN standard looks to be enterprise-ready, but many businesses are wary about buying pre-standard equipment It's faster and has far greater range than current wireless LAN technology. And it's stable. So is the most recent draft of the 802.11n wireless LAN standard ready for enterprise adoption? Such products are widely available for consumers even though final ratification isn't expected for more than a year. However......
[more] Wi-Fi: The next generation Despite interminable delays to the forthcoming 802.11n wireless networking standard, there's a consensus it will finally materialise in March 2009. Meantime, it's being touted as a fix-all for Wi-Fi's various shortcomings. The standard promises to improve range and boost traffic throughput, from the existing 54Mbps (megabits per second) offered by 802.11g-based technology, to between 100Mbps and 300Mbps, depending on a range of factors.The performance improvement takes......
[more] T-shirt sniffs out Wi-Fi networks Website retailer ThinkGeek is selling a cotton T-shirt that lights up when it detects a nearby Wi-Fi network. Known as the Wi-Fi Detector Shirt, it features an animated decal that that has glowing bars which lights up when there is an IEEE 802.11b or 802.11g network in range. However, it cannot yet detect networks using 802.11n Draft 2.0. More bars light up as the signal gets stronger. The 100 percent cotton T-shirt is only available in black and cost $29.99. T......
[more] Extended WiFi range creates security risks A growing number of gadgets are now appearing on the market to offer WiFi users extended range when picking up "free" WiFi signals. "These devices, which can be obtained for under 20.00 pounds or so, can easily extend the effective range of a WiFi access point or router up to two or three hundred yards. This means that companies that think their WiFi access point is limited to their company building, need to think again," said David Hobson, GSS' managin......
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