Characteristics of Computer Network Media
With the emergence of the Ethernet LAN (Local Area Network) introduced in the early 1970s by Xerox, the telecommunications world has welcomed this newfound gift with open arms. Since communications is such a vital aspect of all businesses these days, proper acquaintance with this marvelous technology can greatly enhance your company's productivity and efficiency. In this paper, we will reflect into the many different characteristics of media that the LANs are based upon and compare/contrast these different medias.
There are basically four types of media used for Local Area Networks. The most commonly used are twisted copper pairs, Coaxial cables, Fiber Optic, and the Wireless technology.
Twisted copper wire, also known, as the common telephone wire is very similar to the wires used in telephone systems. However, the twisted pair wire required for reliable data transmission is of a heavier gauge than the telephone wire. It uses 24 to 26 AWG (American Wire Gauge, www.datapro.com). The purpose of twisting the copper wires together is to minimize the interference between the two adjacent wires. Otherwise, there would be too much line noise to transfer voice or data efficiently. There are two different types of twisted pairs that are used to transmit data. The STP (Shielded Twisted Pair) and the UTP (Unshielded Twisted Pair). Just like it sounds, the STP is a special kind of copper telephone wiring used in some business installations. An outer covering or a shield is added to the twisted pair acting as a ground. This process shields the twisted pair from EMI (Electro-magnetic Interference), which will disturb the data transmission greatly. The UTP is just a twisted pai...
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...meters. This media is also a turn off to many because of its high cost and the complexity of implementation. The antennae installed must be precise in its direction; the slightest deviation will result in failure of signal transmission. Generally, large corporations employ these media to interconnect LANs between buildings to bypass the local telephone company.
Technology Spread Spectrum Narrowband Microwave Infrared
Maximum Coverage 105 to 800 feet, or up to 50,000 square feet 40 to 130 feet, or up to 5,000 square feet 30 to 80 feet
Line of Sight Required No No Yes
Transmit Power Less than 1W (U.S.) or 100mW (Europe) 25mW Does not apply
License Required No Yes No
Inter-building Use Possible with unidirectional antenna No Possible
Rated Speed (percent of 10 Mbps wire) 20 to 50 (most versions available) 33 50 to 100
n.a. - n.a. - n.a. - n.a. - n.a. - A+E Networks. 2009. The 'Standard' of the 'Standard'. Web. The Web.
Like a lot inventions in the past two centuries, modern fibre optic cable was created for military uses. The manager for Copper Cable and Wire at the US Army Signal Corps was getting more displeased with the amount of signal loss that was due to copper cable.
RECONFIGURABLE RADIOS NASA reconfigurable radio communication to solve the problem of small data transfers over small distances. In 2014, the Malaysia Air Flight 370 containing 239 passengers on board, went missing somewhere in depths of the Indian Ocean, and out of radar range. The search for the plane lasted almost three years, but after discovering they had been searching in the wrong places, and the search had cost over 160 million Australian dollars, it got called off on January 17th. (& Devlin, 2017)
Sending data through the internet efficiently has always posed many problems. The two major technologies used, Ethernet and Asynchronous Transfer Mode (ATM), have done an admirable job of porting data, voice and video from one point to another. However, they both fall short in differing areas; neither has been able to present the "complete" package to become the single, dominant player in the internet market. They both have dominant areas they cover. Ethernet has dominated the LAN side, while ATM covers the WAN (backbone). This paper will compare the two technologies and determine which has a hand-up in the data trafficking world.
In most cases cable or DSL companies such as Comcast or DirectPC are just a single type of Internet connection company. But sometimes companies acquire these one-connection companies to make their companies bigger and better such as AOL buying Time Warner. As these companies get bigger and start to offer more types of connections they also start to have more security conflicts. AOL’s software for its dial up connection has a firewall built in to it, the firewall protects it users from hackers and unwanted programs from running. And the software works almost perfectly for keeping unwanted people or programs out, but the only catch is you have use their software. Road Runner, which is now part of AOL, is a cable company, which only provides high-speed Internet access, not full proof security. This problem leaves you open for hackers that are randomly barraging Internet connected PC’s with “pings” or “port scans”, probing to find unprotected PCs. Once found, a hacker can compromise your PC with a dangerous Internet threat such as a Trojan horse, spyware or even a malicious worm (Zone Labs).
It just doesn't get much simpler than the physical bus topology when it comes to connecting nodes on a Local Area Network (LAN). The most common implementation of a linear bus topology is IEEE 802.3 Ethernet. All devices in a bus topology are connected to a single cable called the bus, backbone, or ether. The transmission medium has a physical beginning and an end. All connections must be terminated with a resistor to keep data transmissions from being mistaken as network traffic. The terminating resistor must match the impedance of the cable.
Meade, Peter. “Cellular’s Father knows best. (cellular telephone inventor Martin Copper) (Interview).” American’s Network. 01 Mar. 1997: 44(2). eLibrary. Web. 11 Feb. 2014.
What is media? Based on Oxford dictionary, media refers to the mass communication. This is mean that media is something that is used for communication. There are two types of media which is printed media and electronic media. Before this, people always look up to the printed media if they want to get the information. However, today people are mostly will choose the electronic media as their tools for getting information. This is due to the fact that we are living in the technology era.
A communications network can provide many types of service. The most basic type of service is known as simplex. This service provides one-way communication. Examples of this type of service are TV distribution, and the transmission of burglar alarm messages.
The sound waves from the caller's voice cause the plastic disk to vibrate, changing the distance between the disks, thus changing the intensity of the electric field. These variations are translated into an electric current which travels across the telephone lines. The receiver of a telephone is composed of a flat ring of magnetic material. Underneath this magnetic ring is a coil of wire where the electric current flows. Here, the current and magnetic field from the magnet cause a diaphragm between the two to vibrate, and replicate the sounds that are transformed into electricity.
The company has just set up a few months, so experience in management in the company's networking system is very weak. The company should get some advice from networking to facilitate the daily work and business of the company.
Local Area Networks also called LANs have been a major player in industrialization of computers. In the past 20 or so years the worlds industry has be invaded with new computer technology. It has made such an impact on the way we do business that it has become essential with an ever-growing need for improvement. LANs give an employer the ability to share information between computers with a simple relatively inexpensive system of network cards and software. It also lets the user or users share hardware such as Printers and scanners. The speed of access between the computers is lighting fast because the data has a short distance to cover. In most cases a LAN only occupies one or a group of buildings located next to each other. For larger area need there are several other types of networks such as the Internet.
Mirabito, Michael M.A; and Morgenstern, Barbara L., The New Communications Technologies: Applications, Policy, and Impact, 5th. Edition. Focal Press, 2004.
Network first appeared in the 1950s. In the 1950 s, communication researchers recognize the need to allow a regular communication between different computer users and different communication networks. This prompted the dispersed network, queuing theory and research of the packet exchange. In 1960 the ARPA net which is the U.S. Advanced Research Projects Agency (ARPA) according to the sake of the cold war established caused a big technological progress and make it become the de...
People in the present society have turned from the use of the old means of communication to the more advanced and technological ways of communicating. Technology has made it easier for people to communicate in a faster, efficient, and cost saving means through the introduction of the communication channels. The world has turned out to be the centre for technology with different technologies emerging daily as the people continue to develop from time to time to cope with the growing technology. The benefits of adopting the communication technology are explained in this article which shows why people do not function without technology.