`
`Choosing a WLAN Standard: 802.11a vs. 802.11b | Computerworld
`
`The New Digital Workplace: The New Reality Is Now. Learn More.
`
`FEATURE
` UNITED STATES
`Choosing a WLAN Standard: 802.11a vs. 802.11b
`By Drew Robb
`Computerworld |
`DEC 16, 2002 12:00 AM PST
`
`The most common types of wireless LANs today support the 802.11b standard. Although faster 802.11a
`
`equipment has been available for some time, vendors of enterprise-class WLAN equipment -- with
`
`more sophisticated security and management options -- have only recently entered the market. With
`
`802.11a maturing, choosing the right technology now depends on understanding the technology
`
`differences and matching them to your needs.
`
`Also called Wi-Fi, 802.11b operates at 2.4 GHz with a maximum transmission rate of 11M bit/sec. at the
`
`access point (AP). Meanwhile, 802.11a operates on the less-crowded 5-GHz band and runs at up to
`
`54M bit/sec. Although the 802.11a and 802.11b specs are incompatible, vendors offer so-called dual-
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`mode APs that support both. A future standard, 802.11g, may offer 802.11a speeds and backward
`
`compatibility to 802.11b.
`
`The 802.11a standard offers more nonoverlapping channels per AP that clients can use: eight, vs. three
`
`for 802.11b. Since it operates at a higher frequency, though, 802.11a has a shorter range and requires
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`more APs for a given coverage area. That makes 802.11a more expensive for applications such as
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`warehouse data entry that don't need the extra bandwidth. And while 802.11b is available in Europe,
`
`802.11a is not. For higher bandwidth, network designers will need to investigate the European
`
`HiperLAN2 standard.
`
`[ Related: Tech event calendar: Upcoming shows, conferences and IT expos ]
`
`Even if 802.11b is adequate, the network design should support a future move to 802.11a using dual-
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`mode APs. Some organizations are even running 802.11a for voice-over-IP applications and 802.11b
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`for data using this configuration. But that gives designers yet another standard to worry about: To
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`ensure good sound quality and performance, APs should support the 802.11e quality-of-service
`
`specification.
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`
`
`ADVERTISING
`
`https://www.computerworld.com/article/2580570/choosing-a-wlan-standard--802-11a-vs--802-11b.html
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`1/4
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`Bell Northern Research, LLC, Exhibit 2012, Page 1 of 4
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`
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`5/25/2020
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`Choosing a WLAN Standard: 802.11a vs. 802.11b | Computerworld
`
`The New Digital Workplace: The New Reality Is Now. Learn More.
`
` UNITED STATES
`
`Robb is a freelance writer in Tujunga, Calif. Contact him at drewrobb@attbi.com.
`
`Copyright © 2002 IDG Communications, Inc.
`
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`https://www.computerworld.com/article/2580570/choosing-a-wlan-standard--802-11a-vs--802-11b.html
`
`2/4
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`Bell Northern Research, LLC, Exhibit 2012, Page 2 of 4
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`
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`5/25/2020
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`Choosing a WLAN Standard: 802.11a vs. 802.11b | Computerworld
`
`The New Digital Workplace: The New Reality Is Now. Learn More.
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`https://www.computerworld.com/article/2580570/choosing-a-wlan-standard--802-11a-vs--802-11b.html
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`3/4
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`Bell Northern Research, LLC, Exhibit 2012, Page 3 of 4
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`
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`5/25/2020
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`Choosing a WLAN Standard: 802.11a vs. 802.11b | Computerworld
`
`Copyright © 2020 IDG Communications, Inc.
`The New Digital Workplace: The New Reality Is Now. Learn More.
`
` UNITED STATES
`
`https://www.computerworld.com/article/2580570/choosing-a-wlan-standard--802-11a-vs--802-11b.html
`
`4/4
`
`Bell Northern Research, LLC, Exhibit 2012, Page 4 of 4
`
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