Wireless Broadband is a fairly new technology that provides high-speed wireless internet and data network access over a wide area.
Few WISPs provide download speeds of over 100 Mbit/s; most broadband wireless access services are estimated to have a range of 50 km (30 miles) from a tower.Technologies used include LMDS and MMDS, as well as heavy use of the ISM bands and one particular access technology is being standardized by IEEE 802.16, also known as WiMAX. WiMAX is highly popular in Europe but has not met full acceptance in the United States because cost of deployment does not meet return on investment figures. In 2005 the Federal Communications Commission adopted a Report and Order that revised the FCC’s rules to open the 3650 MHz band for terrestrial wireless broadband operations.[2] On November 14, 2007 the Commission released Public Notice DA 07-4605 in which the Wireless Telecommunications Bureau announced the start date for licensing and registration process for the 3650-3700 MHz band.
Initially, Wireless Internet Service Providers (WISPs) were only found in rural areas not covered by cable or DSL.[4] These early WISPs would employ a high-capacity T-carrier, such as a T1 or DS3 connection, and then broadcast the signal from a high elevation, such as at the top of a water tower. To receive this type of Internet connection, consumers mount a small dish to the roof of their home or office and point it to the transmitter. Line of sight is usually necessary for WISPs operating in the 2.4 and 5GHz bands with 900MHz offering better NLOS performance.
Mobile wireless broadband
Wireless broadband technologies also include new services from companies such as Verizon, Sprint, and AT&T Mobility, which allow a more mobile version of this broadband access. Consumers can purchase a PC card, laptop card, or USB equipment to connect their PC or laptop to the Internet via cell phone towers. This type of connection would be stable in almost any area that could also receive a strong cell phone connection. These connections can cost more for portable convenience as well as having speed limitations in all but urban environments.
Sunday, December 14, 2008
Hardware Wireless Network
Wireless network adapters (also known as wireless NICs or wireless network cards) are required for each device on a wireless network. Some newer laptop computers incorporate wireless adapters as a built-in feature of the system. Separate add-on adapters must be purchased for most computers, however.
Popular wireless network adapters for PCs exist in the form of a PCMCIA "credit card." Macintosh computers use the distinctive AirPort card. USB wireless adapters that do not resemble cards also exist.
Strictly speaking, no wireless hardware other than adapters is required to build a small wireless LAN (WLAN). However, to increase the performance of a WLAN, accommodate more computers, and increase the network's range, wireless access points and/or wireless routers can be deployed.
Wireless routers function comparably to traditional routers for wired networks. One generally deploys wireless routers when building an all-wireless network from the ground up.
An alternative to routers, access points allow wireless networks to join an existing wired network. One typically deploys access points when growing a network that already has a wired switch or router installed. In home networking, a single access point (or router) possesses sufficient range to span most homes. Businesses in office buildings often must deploy multiple access points and/or routers.
Access points and routers often utilize a wireless antenna that significantly increase the communication range of the wireless radio signal. These antennas are optional and removable on most equipment. It's also possible to mount antennas on wireless clients to increase the range of wireless adapters. This is common practice for wardrivers, but add-on antennas are generally not required in typical home or business networks.
Popular wireless network adapters for PCs exist in the form of a PCMCIA "credit card." Macintosh computers use the distinctive AirPort card. USB wireless adapters that do not resemble cards also exist.
Strictly speaking, no wireless hardware other than adapters is required to build a small wireless LAN (WLAN). However, to increase the performance of a WLAN, accommodate more computers, and increase the network's range, wireless access points and/or wireless routers can be deployed.
Wireless routers function comparably to traditional routers for wired networks. One generally deploys wireless routers when building an all-wireless network from the ground up.
An alternative to routers, access points allow wireless networks to join an existing wired network. One typically deploys access points when growing a network that already has a wired switch or router installed. In home networking, a single access point (or router) possesses sufficient range to span most homes. Businesses in office buildings often must deploy multiple access points and/or routers.
Access points and routers often utilize a wireless antenna that significantly increase the communication range of the wireless radio signal. These antennas are optional and removable on most equipment. It's also possible to mount antennas on wireless clients to increase the range of wireless adapters. This is common practice for wardrivers, but add-on antennas are generally not required in typical home or business networks.
AirMagnet Wireless Network
AirMagnet, the leader in wireless LAN (WLAN) security and performance solutions, today announced that Microsoft selected its Mobile and Distributed products to manage its wireless LAN (WLAN) at the Tech-Ed 2004 conference held in San Diego, Calif. (May 23 - 28, 2004). The conference used AirMagnet's Distributed 4.0, Laptop and Handheld solutions to set up and monitor its wireless network.
AirMagnet Ensured Smooth Sailing for Wireless Networks at CTIA WIRELESS
AirMagnet, the leader in wireless LAN (WLAN) security and performance solutions, today announced that Comsearch, an Andrew Company and the market leader in complex radio spectrum management services and systems, selected AirMagnet's Laptop Analyzer to help troubleshoot and maintain hiccup-free wireless connectivity at the CTIA WIRELESS 2005 conference in New Orleans. In addition to the exhibit space, Comsearch was also responsible for monitoring the 7,000 square foot Wireless Home, a showcase of advanced communications and interactive technology within a home.
AirMagnet Ensured Smooth Sailing for Wireless Networks at CTIA WIRELESS
AirMagnet, the leader in wireless LAN (WLAN) security and performance solutions, today announced that Comsearch, an Andrew Company and the market leader in complex radio spectrum management services and systems, selected AirMagnet's Laptop Analyzer to help troubleshoot and maintain hiccup-free wireless connectivity at the CTIA WIRELESS 2005 conference in New Orleans. In addition to the exhibit space, Comsearch was also responsible for monitoring the 7,000 square foot Wireless Home, a showcase of advanced communications and interactive technology within a home.
Wireless Optical Mesh Solution Network
ClearMesh Networks Wednesday launched a wireless optical mesh solution designed to fill the gap between copper, RF and fiber in delivering 5mbps to 100mbps services to small and midsized businesses.
“There isn’t a cost-effective way for carriers today to extend fiber to SMBs,” said Fima Vaisman, ClearMesh’s senior vice president of marketing, explaining their monthly spend of $500 to $1,000 does not support a fiber trench where it is not already available. “What we provide is a solution that extends the fiber core without having to trench fiber.”
It also provides higher bandwidth than do copper and RF solutions, such as Wi-Fi and WiMAX, he said. “If a customer needs more bandwidth and they are looking for an SLA, we think there is a gap between those solutions provided at the entry level by WiMAX and Wi-Fi, and the high-end level by fiber. There is a gap in the middle. That is the gap we are trying to serve.”
Available immediately, the ClearMesh Metro Grid solution includes the ClearMesh 300 node, which can be mounted on a pole or rooftop, and the ClearMesh Management System, which provides tools for installation, diagnostics, service analysis and provisioning. The ClearMesh 300 node combines wireless and optical technologies with a Layer 2 mesh architecture to deliver business-grade Ethernet.
“The ClearMesh 300 Node is a switching platform,” explained Vaisman. “It has an Ethernet switch with 2-gigabit Ethernet capacity. Four of the Ethernet ports are copper and they are connected to optical transceivers.”
The optical transceivers, he said, are LED-based, which gives them a wider beam than systems using lasers, like free-space optics. “What that allows the product to do is be installed on a light pole as well as on top of a building,” said Vaisman. “A laser product cannot be installed on a light pole because the light pole has too much vibration, too much movement. The product wouldn’t stay locked on. With the product we have the light beams are locked on and stay locked on using automatic tracking whether on a light pole or building. With that you have a much broader ability to deploy a mesh in a metro area. If the device moves, the light cone still hits the other node.”
Each node has three optical transceivers, which operate on the license-free 850nm light band and reach 250 meters. Each transceiver is motorized, so it can move independently up and down, and 360 degrees around. “This allows each node to see three other nodes. Using that, we create a mesh,” said Vaisman, explaining the mesh requires one node to be fiber-feed, and several nodes can be fed from the same fiber to increase the capacity delivered into the mesh.
The ClearMesh node lists for $6,000, and less in volume. Considering installation costs, the company uses $5,000 per node in its ROI calculations. In contrast to trenching fiber, ClearMesh can cover seven buldings in a MetroGrid network for $35,000 in a matter of days while the fiber deployment over the same area will cost $180,000 and take months to install, he said. With a single customer per building and a single T1 replacement at $500 per month, the payback is 10 months, Vaisman said, adding a more realistic scenario is three customers per building paying $750 per month for a 10mbps service for an ROI of two months.
Yankee Group Analyst Tara Howard agrees that the ClearMesh solution serves “as a logical extension of a fiber network,” but she questions the market potential, discounting its appeal to Tier 1 companies that are laying fiber. “The opportunity is going to be with local LECs and municipalities,” she said, adding the fact that it does not compete with Wi-Fi or WiMAX is a plus.
“We don’t do what Wi-Fi does; we don’t offer mobility,” said Vaisman. “We don’t do what WiMAX does; we don’t offer five-mile reach. In a dense metro area, we offer high bandwidth and the ability to sign SLAs without any interference,” he said. The systems offers latency at one-tenth of 1ms, so 10 nodes equals 1ms of delay.
“There isn’t a cost-effective way for carriers today to extend fiber to SMBs,” said Fima Vaisman, ClearMesh’s senior vice president of marketing, explaining their monthly spend of $500 to $1,000 does not support a fiber trench where it is not already available. “What we provide is a solution that extends the fiber core without having to trench fiber.”
It also provides higher bandwidth than do copper and RF solutions, such as Wi-Fi and WiMAX, he said. “If a customer needs more bandwidth and they are looking for an SLA, we think there is a gap between those solutions provided at the entry level by WiMAX and Wi-Fi, and the high-end level by fiber. There is a gap in the middle. That is the gap we are trying to serve.”
Available immediately, the ClearMesh Metro Grid solution includes the ClearMesh 300 node, which can be mounted on a pole or rooftop, and the ClearMesh Management System, which provides tools for installation, diagnostics, service analysis and provisioning. The ClearMesh 300 node combines wireless and optical technologies with a Layer 2 mesh architecture to deliver business-grade Ethernet.
“The ClearMesh 300 Node is a switching platform,” explained Vaisman. “It has an Ethernet switch with 2-gigabit Ethernet capacity. Four of the Ethernet ports are copper and they are connected to optical transceivers.”
The optical transceivers, he said, are LED-based, which gives them a wider beam than systems using lasers, like free-space optics. “What that allows the product to do is be installed on a light pole as well as on top of a building,” said Vaisman. “A laser product cannot be installed on a light pole because the light pole has too much vibration, too much movement. The product wouldn’t stay locked on. With the product we have the light beams are locked on and stay locked on using automatic tracking whether on a light pole or building. With that you have a much broader ability to deploy a mesh in a metro area. If the device moves, the light cone still hits the other node.”
Each node has three optical transceivers, which operate on the license-free 850nm light band and reach 250 meters. Each transceiver is motorized, so it can move independently up and down, and 360 degrees around. “This allows each node to see three other nodes. Using that, we create a mesh,” said Vaisman, explaining the mesh requires one node to be fiber-feed, and several nodes can be fed from the same fiber to increase the capacity delivered into the mesh.
The ClearMesh node lists for $6,000, and less in volume. Considering installation costs, the company uses $5,000 per node in its ROI calculations. In contrast to trenching fiber, ClearMesh can cover seven buldings in a MetroGrid network for $35,000 in a matter of days while the fiber deployment over the same area will cost $180,000 and take months to install, he said. With a single customer per building and a single T1 replacement at $500 per month, the payback is 10 months, Vaisman said, adding a more realistic scenario is three customers per building paying $750 per month for a 10mbps service for an ROI of two months.
Yankee Group Analyst Tara Howard agrees that the ClearMesh solution serves “as a logical extension of a fiber network,” but she questions the market potential, discounting its appeal to Tier 1 companies that are laying fiber. “The opportunity is going to be with local LECs and municipalities,” she said, adding the fact that it does not compete with Wi-Fi or WiMAX is a plus.
“We don’t do what Wi-Fi does; we don’t offer mobility,” said Vaisman. “We don’t do what WiMAX does; we don’t offer five-mile reach. In a dense metro area, we offer high bandwidth and the ability to sign SLAs without any interference,” he said. The systems offers latency at one-tenth of 1ms, so 10 nodes equals 1ms of delay.
LAN Local Area Network
Definition: A local area network (LAN) supplies networking capability to a group of computers in close proximity to each other such as in an office building, a school, or a home. A LAN is useful for sharing resources like files, printers, games or other applications. A LAN in turn often connects to other LANs, and to the Internet or other WAN.
Most local area networks are built with relatively inexpensive hardware such as Ethernet cables, network adapters, and hubs. Wireless LAN and other more advanced LAN hardware options also exist.
Specialized operating system software may be used to configure a local area network. For example, most flavors of Microsoft Windows provide a software package called Internet Connection Sharing (ICS) that supports controlled access to LAN resources.
The term LAN party refers to a multiplayer gaming event where participants bring their own computers and build a temporary LAN.
Also Known As: local area network
Examples: The most common type of local area network is an Ethernet LAN. The smallest home LAN can have exactly two computers; a large LAN can accommodate many thousands of computers. Many LANs are divided into logical groups called subnets. An Internet Protocol (IP) "Class A" LAN can in theory accommodate more than 16 million devices organized into subnets.
Most local area networks are built with relatively inexpensive hardware such as Ethernet cables, network adapters, and hubs. Wireless LAN and other more advanced LAN hardware options also exist.
Specialized operating system software may be used to configure a local area network. For example, most flavors of Microsoft Windows provide a software package called Internet Connection Sharing (ICS) that supports controlled access to LAN resources.
The term LAN party refers to a multiplayer gaming event where participants bring their own computers and build a temporary LAN.
Also Known As: local area network
Examples: The most common type of local area network is an Ethernet LAN. The smallest home LAN can have exactly two computers; a large LAN can accommodate many thousands of computers. Many LANs are divided into logical groups called subnets. An Internet Protocol (IP) "Class A" LAN can in theory accommodate more than 16 million devices organized into subnets.
Wireless LAN
A wireless LAN or WLAN or wireless local area network is the linking of two or more computers or devices using spread-spectrum or OFDM modulation technology based to enable communication between devices in a limited area. This gives users the mobility to move around within a broad coverage area and still be connected to the network.
For the home user, wireless has become popular due to ease of installation, and location freedom with the gaining popularity of laptops. Public businesses such as coffee shops or malls have begun to offer wireless access to their customers; some are even provided as a free service. Large wireless network projects are being put up in many major cities. Google is even providing a free service to Mountain View, California[1] and has entered a bid to do the same for San Francisco.[2] New York City has also begun a pilot program to cover all five boroughs of the city with wireless Internet access
For the home user, wireless has become popular due to ease of installation, and location freedom with the gaining popularity of laptops. Public businesses such as coffee shops or malls have begun to offer wireless access to their customers; some are even provided as a free service. Large wireless network projects are being put up in many major cities. Google is even providing a free service to Mountain View, California[1] and has entered a bid to do the same for San Francisco.[2] New York City has also begun a pilot program to cover all five boroughs of the city with wireless Internet access
WiMAX
WiMAX, meaning Worldwide Interoperability for Microwave Access, is a telecommunications technology that provides for the wireless transmission of data using a variety of transmission modes, from point-to-point links to portable internet access[citation needed]. The technology provides up to 75 Mb/sec symmetric broadband speed without the need for cables. The technology is based on the IEEE 802.16 standard (also called Broadband Wireless Access). The name "WiMAX" was created by the WiMAX Forum, which was formed in June 2001 to promote conformity and interoperability of the standard. The forum describes WiMAX as "a standards-based technology enabling the delivery of last mile wireless broadband access as an alternative to cable and DSL".[1]
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