Wireless network:

Wireless icon

1. A wireless network is any type of computer network that uses wireless data connections for connecting network nodes
2. Wireless networking is a method by which homes, telecommunications networks and enterprise (business) installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations
3. Wirelesstelecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure.

4.Examples of wireless networks include cell phone networks, Wireless local area networks (WLANs), wireless sensor networks, satellite communication networks, and terrestrialmicrowave networks.

Wireless network:

Wireless icon

A wireless network is any type of computer network that uses wireless data connections for connecting network nodes^[1]

Wireless networking is a method by which homes, telecommunications networks and enterprise (business) installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations.^[2] Wirelesstelecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure.^[3]

Examples of wireless networks include cell phone networks, Wireless local area networks (WLANs), wireless sensor networks, satellite communication networks, and terrestrialmicrowave networks.^[4]

Wireless network

From Wikipedia, the free encyclopedia

Wireless icon

A wireless network is any type of computer network that uses wireless data connections for connecting network nodes^[1]

Wireless networking is a method by which homes, telecommunications networks and enterprise (business) installations avoid the costly process of introducing cables into a building, or as a connection between various equipment locations.^[2] Wirelesstelecommunications networks are generally implemented and administered using radio communication. This implementation takes place at the physical level (layer) of the OSI model network structure.^[3]

Examples of wireless networks include cell phone networks, Wireless local area networks (WLANs), wireless sensor networks, satellite communication networks, and terrestrialmicrowave networks.^[4]

Contents

 :

 

• 1.History
  
  
  
• 2.Wireless links
  
  
  
• 3.Types of wireless networks
  
  
  
  • 3.1Wireless PAN
    
    
  • 3.2Wireless LAN
    
    
    
  • 3.3Wireless Ad Hoc Networks
    
    
    
  • 3.4Wireless MAN
    
    
    
  • 3.5Wireless WAN
    
    
    
  • 3.6Global area network
    
    
    
  • 3.7Space network
    
    
    
    
    
    
• 4.Different uses
  
  
  
• 5.Properties
  
  
  
  • 5.1General
    
    
    
  • 5.2Performance
    
    
    
  • 5.3Space
    
    
    
  • 5.4Home
    
    
    
  • 5.5Wireless Network Elements
    
    
    
  • 5.6Difficulties
    
    
    
    • 5.6.1Interferences
      
      
      
    • 5.6.2Absorption and reflection
      
      
      
    • 5.6.3Multipath fading
      
      
      
    • 5.6.4Hidden node problem
      
      
      
    • 5.6.5Shared resource problem
      
      
      
  • 5.7Capacity
    
    
    
    • 5.7.1Channel
      
      
      
    • 5.7.2Network
      
      
      
• 6.Safety
  
  
  
• 7.See also
  
  
• 8.References
  
  
• 9.Further reading

Contents

  

• 1History
• 2Wireless links
• 3Types of wireless networks
  • 3.1Wireless PAN
  • 3.2Wireless LAN
  • 3.3Wireless Ad Hoc Networks
  • 3.4Wireless MAN
  • 3.5Wireless WAN
  • 3.6Global area network
  • 3.7Space network
• 4Different uses
• 5Properties
  • 5.1General
  • 5.2Performance
  • 5.3Space
  • 5.4Home
  • 5.5Wireless Network Elements
  • 5.6Difficulties
    • 5.6.1Interferences
    • 5.6.2Absorption and reflection
    • 5.6.3Multipath fading
    • 5.6.4Hidden node problem
    • 5.6.5Shared resource problem
  • 5.7Capacity
    • 5.7.1Channel
    • 5.7.2Network
• 6Safety
• 7See also
• 8References
• 9Further reading
• 10External links

Contents

  [hide] 

• 1History
• 2Wireless links
• 3Types of wireless networks
  • 3.1Wireless PAN
  • 3.2Wireless LAN
  • 3.3Wireless Ad Hoc Networks
  • 3.4Wireless MAN
  • 3.5Wireless WAN
  • 3.6Global area network
  • 3.7Space network
• 4Different uses
• 5Properties
  • 5.1General
  • 5.2Performance
  • 5.3Space
  • 5.4Home
  • 5.5Wireless Network Elements
  • 5.6Difficulties
    • 5.6.1Interferences
    • 5.6.2Absorption and reflection
    • 5.6.3Multipath fading
    • 5.6.4Hidden node problem
    • 5.6.5Shared resource problem
  • 5.7Capacity
    • 5.7.1Channel
    • 5.7.2Network
• 6Safety
• 7See also
• 8References
• 9Further reading
• 10External links

History:

• The first professional wireless network was developed under the brand ALOHAnet in 1969 at the university of Hawaii.

•  It became operational in June, 1971. 

• The first commercial wireless network was the WaveLAN productfamliy, developed byNCR in 1986.

Wireless links:

Computers are very often connected to networks using wireless links, e.g. WLANs

• Terrestrial microwave – Terrestrial microwave communication uses Earth-based transmitters and receivers resembling satellite dishes. Terrestrial microwaves are in the low gigahertz range, which limits all communications to line-of-sight. Relay stations are spaced approximately 48 km (30 mi) apart.

• Communications satellites – Satellites communicate via microwave radio waves, which are not deflected by the Earth's atmosphere. The satellites are stationed in space, typically in geosynchronous orbit 35,400 km (22,000 mi) above the equator.
•  These Earth-orbiting systems are capable of receiving and relaying voice, data, and TV signals.

• Cellular and PCS systems use several radio communications technologies. The systems divide the region covered into multiple geographic areas. Each area has a low-power transmitter or radio relay antenna device to relay calls from one area to the next area.

• Radio and spread spectrum technologies – Wireless local area networks use a high-frequency radio technology similar to digital cellular and a low-frequency radio technology. Wireless LANs use spread spectrum technology to enable communication between multiple devices in a limited area. IEEE 802.11 defines a common flavor of open-standards wireless radio-wave technology known as Wifi.

• Free-space optical communication uses visible or invisible light for communications. In most cases, line-of-sight propagation is used, which limits the physical positioning of communicating devices.

Wireless links:

Computers are very often connected to networks using wireless links, e.g. WLANs

• 
  
• 
  
• Terrestrial microwave – Terrestrial microwave communication uses Earth-based transmitters and receivers resembling satellite dishes. Terrestrial microwaves are in the low gigahertz range, which limits all communications to line-of-sight. Relay stations are spaced approximately 48 km (30 mi) apart.

• Communications satellites – Satellites communicate via microwave radio waves, which are not deflected by the Earth's atmosphere. The satellites are stationed in space, typically in geosynchronous orbit 35,400 km (22,000 mi) above the equator. These Earth-orbiting systems are capable of receiving and relaying voice, data, and TV signals.
• Cellular and PCS systems use several radio communications technologies. The systems divide the region covered into multiple geographic areas. Each area has a low-power transmitter or radio relay antenna device to relay calls from one area to the next area.
• Radio and spread spectrum technologies – Wireless local area networks use a high-frequency radio technology similar to digital cellular and a low-frequency radio technology. Wireless LANs use spread spectrum technology to enable communication between multiple devices in a limited area. IEEE 802.11 defines a common flavor of open-standards wireless radio-wave technology known as Wifi.
• Free-space optical communication uses visible or invisible light for communications. In most cases, line-of-sight propagation is used, which limits the physical positioning of communicating devices.