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If telephone lines are used then serial access program are used to enable the communication of the computer with telephone line. Because the firm employees require voice transmission voIP system is necessary, this system helps set up and separate calls into audio codec’s. The speech is encoded to allow transmission over the IP network as an audio stream (Haykin, Let us write or edit the essay on your topic "Telecommunication systems" with a personal 20% discount.. Try it now 2001).
They help in data transfer, i.e. data reception and transmission between the terminus equipment. They enable in conversion of data from analogue to digital and vice versa, modems, microwave links, wireless link, repeaters hubs are all used in computer networking to enable data transfer. In the case of the medium sized firm modems and hubs can be used.
This refers to the path/ medium used for data transmission. Most common data communication channels are copper wires, fiber optic cables, coaxial cable and microwave links. The most common types of communication channels are the simplex communication and duplex communication.
This is the control software present in all computers and helps in controlling network functions and activities. In the case of the medium sized firm this will include application software to be used is run on the application server such as java application server, Microsoft platforms, Zend platforms etc. for the firm to implement WAN, application web server which accept HTTP program request from the user has to be used. web severs perform authentication, handling of file static and dynamic content, HTTP support through encrypted connections, data compression for transmission, virtual hosting bandwidth throttling among other functions. Exchange server such as the Microsoft exchange server aids in electronic mail exchange, support for web and mobile programs.
The help in interconnecting computers within a small area. E.g. in this case the company with 20 – 50 employees, if all the employees have computers, these computers can be interlinked
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