Networking Essentials

Topics: Computer network, Local area network, Wide area network Pages: 5 (1404 words) Published: May 17, 2013
A brief description the features of telecommunications networks, including key networking technologies. Cover the Open Systems Interconnection (OSI) model, including each logical layer A telecommunications network includes the following features: 1. Terminals for accessing the network

2. Computers that process information and are interconnected by the network 3. Telecommunications links that form a channel through which information is transmitted from a sending device to a receiving device. 4. Telecommunications equipment that facilitates the transmission of information. 5. Telecommunications software that controls message transmission over the network.(1) Key networking technologies includes the traditional telephone system, mobile cellular communication, wireless local-area networks, videoconferencing systems, a corporate Website, intranets, extranets, and an array of local and wide-area networks, including the Internet (2)

The ISO/OSI model was designed to formulate a standard for allowing different types and brands of computers to communicate with one another. It’s a conceptual model for the communication process that has seven discrete layers each with a specific responsibility or function:

Physical-defines the electrical, mechanical, procedural, and functional specifications for activating and maintaining the physical link (such as the cable) between end systems;

Data Link-provides reliable transit of data across the physical link and is responsible for the physical addressing, data error notification, ordered delivery of frames and flow control;

Network-provides connectivity and path selection between two end systems This layer uses routing protocols to select optimal paths to a series of interconnected subnetworks and is responsible for assigning addresses to messages;

Transport-responsible for guaranteed delivery of data It uses data units called datagrams, it is also responsible for fault detection, error recovery, and flow control, this layer manages virtual circuits by setting them up, maintaining them and shutting them down;

Session –responsible for establishing, maintaining and terminating the communication session between applications;

Presentations-responsible for formatting data so that it’s ready for presentation to an application this layer is also responsible for character format translation, such as from ASCII to Unicode, and for syntax selection; Application-this layer is responsible for giving application access to the network; (3)

Discuss whether telephone networks and computer networks will remain distinct in the future. Two months ago, AT&T petitioned the Federal Communications Commission to plan for the retirement of traditional phone networks and transition to what AT&T sees as inevitability: the all-IP telco. AT&T had been discussing the transition internally, spurred on by the FCC's own suggestion that the Public Switched Telephone Network might be ripe for death somewhere around 2018. This telephone network we've grown up with is now an obsolete platform, or at least a rapidly obsolescing platform. It will not be sustainable for the indefinite future. Nobody's making this network technology anymore. It's become more and more difficult to find spare parts for it. And it's becoming more and more difficult to find trained technicians and engineers to work on it. As you can see, the largest company of the telecom industry is opening the dialogue of ending the traditional telephone network. Many may not agree with thus but I think we should be ready if it happens. More and more people are opting out of landlines and opting in wireless/voice of IP. (4) Description of the various network media and how they are changing

Telecommunications links may be implemented with various communication media, with a corresponding variety of characteristics. The main feature of a medium is its potential transmission speed, also known as channel capacity, which for...
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