Network World

research center:

Wireless / Mobile

Search / DocFinder:
Advanced search
Research Centers
Vendor Solutions
Site Resources
Special Issues

Signature SeriesEnterprise All-Stars
Enterprise All-Stars NEW

You in action
You in action

New Data Center The New Data Center: Wireless & Mobility
Wireless & Mobility NEW

The New Data Center: Server Virtualization
Server Virtualization

Error 404--Not Found

Error 404--Not Found

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.

802.16a

802.16a, also known as WiMAX, is a wireless networking standard that offers greater range and bandwidth than the Wi-Fi family of standards, which includes 802.11a, 802.11b and 802.11g. While Wi-Fi is intended to provide coverage over relatively small areas, such as in offices or hot spots, WiMAX can transfer around 70M bit/sec over a distance of 30 miles (48 kilometers) to thousands of users from a single base station.

Approved in January, 2003, 802.16a provides wireless, last-mile broadband access over the frequency bands below 11 GHz to connect homes, businesses and wireless LAN hot spots.

802.16a greatly improves non-line-of-sight performance, and it is the most appropriate technology available when obstacles such as trees and buildings are present. Stations can be mounted on homes or buildings rather than towers on mountains.

With throughput up to 75M bit/sec, the wireless standard gives companies another way to get business-quality broadband service. While it could take several months for a carrier to provision a T-1 line, service providers could provision wireless service in a matter of days.

802.16a provides flexibility not possible with wired services, such as high-speed backhaul for events such as trade shows, with hundreds or even thousands of 802.11 hot-spot users. On-demand connectivity also could benefit businesses such as construction companies that have sporadic or nomadic connectivity needs. The 802.16e extension to 802.16a introduces nomadic capabilities that let users connect while roaming outside their home service areas.

The technology also offers privacy and Triple-DES encryption features to support secure transmissions and authentication.

In a typical enterprise deployment, laptop and desktop computers are connected via wired Ethernet or 802.11 Wi-Fi access points located throughout the campus. An 802.16a directional antenna provides the connection from the business to a service provider's cell tower. Even if there is no line of sight between the antenna and the tower, signal still can be received after it reflects off buildings or other obstructions and reaches the tower indirectly. At the base station, 802.16a technology correctly interprets the information even though reflections distort the radio frequency signal. Backhaul to the Internet is then provided via wireless 802.16 point-to-point links or by traditional wired backhaul such as DS3 and OCX.

Technical aspects of 802.16a that are instrumental in powering robust performance include:

Support for licensed and license-exempt band operation below 11 GHz.

High spectral efficiency, which reduces carriers' costs and improves users' experience.

Forward error correction, for more reliable transmission.

Support for advanced antenna techniques to improve range and capacity.

Space/time coding to enhance performance in fading environments.

Adaptive modulation support, which allows for trade-off of bandwidth for range to reach customers up to 30 miles away.

802.16a technology also provides low latency for delay-sensitive services such as circuit-switched voice traffic or voice over IP, optimized transport for video, and prioritization of data traffic. This is especially important for businesses that want voice in addition to data services from their broadband service provider.

From 802.16a wireless links the last mile, Network World Tech Update, 11/03/03.

Additional resources

WiMAX Forum
Industry group; site has technical specs and news.

WiMAX promises breakthrough in broadband access
IDG News Service, 10/15/03.

Comments:

Wimax
by Barry

Excellent info.



Add a comment

NOTE: Comments are reviewed by an editor before being posted.

Your rating of this resource (with 5 the best)
1 2 3 4 5

Subject:

Your user name (what other users will see on the review):

Your real name (for our records only):

Your e-mail (ditto):

Your comments (Use a blank line to separate paragraphs):

TOP STORIES of 2014

Newsletters
Sign up for one of NWW's Wireless & Mobile newsletters.

Wireless in the Enterprise
Cool Tools alert
Messaging
Wireless News Alert
View all newsletters

Email Address:

Vendor Solutions

White Papers

More...


Research Centers: Applications | Application Development | Applications-Standards | Applications Vendor Solutions | Collaboration | CRM / ERP | Databases | Directories | Grid Computing | Java | Messaging | .Net | RFID | SOAP | Web Services | XML | Convergence & VoIP | Convergence Regulatory | Convergence Services | Convergence Standards | Convergence VoIP Vendor Solutions | Video | IP PBX | SIP | VoIP | VoIP Services | E-Business | DNS | RFID | Supply Chain | Web security LANs & Routers | Acceleration | Gigabit Ethernet | Lans-Standards | Routers | Wireless LANs | Network Management | Application Management | Desktop Management | Management Test Patch Management | Operating Systems | Linux | NetWare | Unix | Windows Outsourcing | Managed Services | Offshoring Security | Firewalls - VPN - Intrusion | Identity management | Patch Management | Microsoft Security | Privacy | Security Standards | Spam & Phishing | Viruses & worms | Web Security | Wireless Security | Servers & Desktop | Backup-Recovery | DataCenter | Desktops | Desktop Management | Grid | Servers | Server Blades | Servers Desktops | Utility Computing | Small & Medium Business | Broadband | Telework | Handhelds & PDAs | Home Networking | Security | Storage | Compliance | Infiniband | Network-Attached Storage | SANs | Storage Management | Storage Virtualization | Virtualization | Vendor News | Bankruptcy | Earnings | Lawsuits | Layoffs | Standards | Start Ups | Vendor Markets | Education | Financial | Healthcare | HIPAA | Manufacturing | Retail | Wide Area Network | Broadband | Carriers | Frame Relay | Metro Ethernet | MPLS | Service providers | Wireless services | Wireless & Mobile | Wireless LANs | PDAs & handhelds | Wireless Security | Wireless Services | Wireless Standards | Wireless Switches | All Company Profiles