Computers - Essay Example

Download file to see previous pages This essay is an evaluation of computer networks dedicated to laptop desktop connection.
Data communication is the transfer of information from the sender to the receiver through a communication medium. The most common media for this process include cables, air/waves and satellite etc. Telephone communication starts with the sender initiating a connection by dialing the recipient’s number from his data transmission equipment (DTE) (Harte and Ofrane 2006). Once he does this, the call passes through either a public switched network (PSTN) or a private branch exchange (PBX) depending on the nature of the call.
A PBX is a telephone switching exchange that is dedicated to controlling telephone communication within a company or an organization. It connects calls within the company by providing extensions to calls that originate from various offices instead of hiring lines for every department. It also connects calls to outside networks. A PSTN connects local and international calls, in a large network structure that is not restricted to a specific subscriber or organization (Harte and Ofrane 2006). Once the call is switched to his address, the receiver is alerted and to complete the connection, he has to switch on his DTE to start transmission.
Telephone switching companies also offer internet connection services through their satellites which act as gateways to wide area networks. This connection involves transmission of digital signals through analog transmitting lines. For this to occur, modems are connected on both ends of the transmission for the purpose of modulating (converting digital signals into analog) the signals from the sending machine and demodulating (converting analog signals back into digital form) signals on the receiving machine (Hennesy 2006). This is because computers only understand digitized information which is in binary form i.e. 1s& 0s
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