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Evolution of the telephone
Evolution of the telephone
Advantages and disadvantages of wireless LAN
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Recommended: Evolution of the telephone
Beginning all the way back in the year 1880, people have wanted to able to communicate with devices wirelessly. One of the earliest events of this occurred when Alexander Graham Bell invented the photophone that allowed people to have an auditory conversation without wires by using light beams. They would have never guessed that over the next one hundred or so years, we would be able to share information wirelessly and charge our mobile devices without having to plug them into an electrical outlet.
Wireless networking is commonly referred to as technology that allows two or more computers to communicate using standard network protocols, but without network cabling such as an Ethernet cable at both ends. Since all of this cabling has become a hassle and nearly impossible to do in situations where you could not do this like in a warehouse, there is an alternative method —a wireless network.
Having the ability to communicate wirelessly has many advantages. One up side is that it is highly convenient for many people. It allows you to access a network from anywhere in your home or office without having to contain a hard lined connection thanks to convenience of the increasingly popular laptop. Another advantage for this would be mobility; you are now able to move about your environment freely as long as you are in range. Many businesses offer free public wi-fi which is a bonus for them because they are relatively easy to set up and are also cost efficient. Productivity is also a large benefit because some employees may not enjoy sitting in a cramped cubical all day. With the help of an access point, the worker can now travel to another location and still accomplish his or her work; therefore possibly being more productive. One of th...
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...rength decreases. The signal strength and reliability of the access point depends on a number of factors such as the brand, environment, and amount of network traffic at the time.
The most common type of wireless networking today is by sending information from a device such as a cell phone to a satellite orbiting Earth which then transports that information to the desired location.
Works Cited
Johnson, Bernadette. "How WiFi Works." HowStuffWorks. Web. 20 Nov. 2013. .
Miller, Patrick. "Wireless Networking 101." PCWorld 11 Nov. 2011: n. pag. Print
Roberts, Richard M. Networking Fundamentals. Tinley Park, IL: Goodheart-Willcox, 2005. N. pag. Print.
"Wireless Networking." , Wi-Fi, 802.11, Wireless Networking. Vicomsof, 2013. Web. 15 Nov. 2013. .
The rapid progress of embedded MEMS (micro-sensing technologies) and wireless communication has made wireless sensor networks possible. Such an environment may have many wireless nodes which are inexpensive; each node is capable of collecting, storing and processing environmental data, and communicating with neighboring nodes. These sensors are connected with wires in the past but tod...
Higher capacity at low cost compared to other. The capacity of a wireless network can be improved by using a repeater if adding extra node are not worth. But to ensure we have a good coverage, we must know the distance between nodes also any inferences between the nodes.
Along with those, I came across some interesting publications and websites which are included in the reference section that give brief introduction to wireless communications and significance of the 802.11 protocols while communication occurs among computer or other devices. These publications clearly depict the functionality of the 802.11n protocol and also describes different factors involved in achieving maximum throughput of 600Mbps.
Wireless is everywhere today, whether at home working from your WIFI network to work where you might be linked to a wireless network or even through your phone through a 3G or 4G network to connecting to an open wireless networks. As you can see for the most part people are connected to wireless from the moment they leave their home till they get to work and then back. Wireless communication definitely provides an advantage over wired networks due to its mobility allowing users to connect from virtually anywhere, however because of this convenience they are also more physically exposed compared to wired networks because of how the data is transmitted given attackers a high number of access points to constantly attack. This also brings around the concern because of a large number of wireless networks constantly being put up most everyone is not going to recognize the importance of securing your network and how easily their data can and probably is being stolen. Think about living in an apartment complex or in a neighborhood and doi...
Wireless networks operate over the full spectrum of network topographies. These topographies include: Personal, Local, Controller, Metropolitan, and Wide area networks. A Personal Area Network (PAN) is ??the interconnection of information technology devices within the range of an individual person, typically within a range of 10 meters.?[2] A Local Area Network (LAN) is ?? a group of computers and associated devices that share a common communications line or wireless link and typically share the resources of a single processor or server within a small geographic area (for example, within an office building).?[2] A Campus Area Network (CAN) is a fiber-optic network that physically interconnects entire buildings into one giant network. While each building may have several discrete LANs within it, each building represents a single node on the CAN. [3] A Metropolitan Area Network (MAN) is ?a network that interconnects users with computer resources in a geographic area or region larger than that covered by even a large [LAN] but smaller than the area covered by a wide area network (WAN [- explained next]).?[2] A Wide Area Network (WAN) is ?a geographically dispersed telecommunications network.?[2]
Radio waves are the keys which make Wi-Fi networking possible. These radio signals are transmitted from antennas and routers and are picked up by Wi-Fi receivers such as computers and cell phones that are equipped with Wi-Fi cards. Whenever a computer receives any of the signals within the range of a Wi-Fi network which is usually 300 – 500 feet for antennas and 100 – 150 feet for routers, the Wi-Fi card will read the signals and thus create an internet connection between the user and the network without the use of a cord. Usually the connection speed is increases as the computer gets closer to the main source of the signal and decreases when the computer gets further away.
A typical home wireless network consists of an access point (AP), several personal computers, and increasingly, personal devices such as tablets or cellphones. Today, a home wireless network is primarily used to provide access to a wired Internet connection via communication that occurs to and from an AP. Future home wireless networks are expected to feature different types of traffic (such as multimedia streaming) which may require efficient communication between any two devices in the home (Papagiannaki, Yarvis, & Conner, 2006).
A wireless sensor network is a set of wireless sensor nodes that organizes a network by itself without the need to have a decentralized communication infrastructure. Numerous functions are performed by the sensor nodes, such as collection of the information, after which the processing of the information is done and finally the storage of the information takes place along with the wireless communication. It consists of large number of sensor nodes and a limited number of sink nodes. Data which is collected by the sensor nodes is then transmitted in the sensor field. The information sent by the sensor nodes are made accessible to the users and also processed to the sink nodes [1].
Bluetooth is a device that uses radio communication to wirelessly connect electronic devices such as cell phones, portable computers, and portable handheld devices to connect to one another as well as to the Internet. According to Wikipedia.org “the communication distance ranges from about 1 meter to a maximum of 100 meters.” This suggests that the network is created using low powered radio waves. Devices using Bluetooth are able to transfer data at a rate of 1 Mbps. Bluetooth technology was established to replace cable networking and to establish communication over short ranges.
A wireless router is what uses an antenna to send signals to wireless devices and a wire to send signals to the Internet.
Disadvantages of wireless networking include: extra costs and equipment to set up, setting up a wireless network can sometimes be difficult for people who are not experienced with computers, file-sharing transfer speeds are normally slower with wireless networks than cabled and wireless connections can be obstructed by everyday household items.
In its fledgling stages, Wi-Fi technology was almost solely used to wirelessly connect laptop computers to the Internet via local area networks (LANs) and also can share files by using newest technology for smart phone that is Kies technology. Wi-Fi technology is now found in a host of non-computer electronic devices as well, such as home theater receivers, video game consoles, Blu-ray players, digital cameras, printer, smartphone and even GPS devices.
On June 21, 1890, Bell and his assistant Charles Sumner invented a wireless telephone, named a photo phone. This photo phone allowed the transmission of both sound and huma...
Wireless communication has improved dramatically in the last few years. Their networks are indispensable providing the means for mobility, city-wide Internet connectivity, distributed sensing and outdoor computing [10]. It allows the transfer of messages between people that are on the other side of the world. Without wireless communications people would not have a lot of the devices many 21st century citizens could not live without, namely the smartphone. It is also required for devices using Bluetooth, remote controls, Wi-Fi; really any electrical devices that communicate via a wireless or wired channel [1]. The popularity of communication systems is seen from nearly anywhere in cellular networks, wireless local area networks
as the Internet, if not for wireless networks. Another use of wireless is in areas where cables simply can not be ran or can not be ran without many complications. Historical buildings, for example, make cabling difficult or impossible due to the old architecture where cabling was not anticipated. Busy areas are another reason for wireless. Reception areas, for instance, may have many people in the area all the time so cabling may not be practical. Another need is for people who are on the move. Good examples of this would be doctors or nurses who are going in and out of rooms and taking a lot of information quickly. Palm pilots using infrared technology, which we will discuss later, makes it possible for a doctor to have information about a patient or to find out possible medications all within a few seconds thanks to these devices. Isolated areas provide another need for wireless networks. In this case, there may not be the availability to link to the network through cables. An office in Alaska would be a good example of this problem. These are just a few examples of the many possible needs of wireless networks.