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For devices to communicate they need an arrangement to communicate in a given language. This arrangement is governed by a set of rules or laws called a protocol. The protocol must define many different aspects of the communication language however given rules dictate that a protocol must as least classify The rate of transmission (baud or bps) Synchronous or asynchronous Half-duplex or full-duplex mode There are a variety of standard protocols from which programmers can …

…transfer data across an analogue telephone cable it needs a way of transforming its digital signal into analogue form. To do this a computer uses a modem to transfer its digital signal into a signal that can be sent down the normal telephone cable. The word Modem Comes from the words modulate - demodulate, as the modem goes through the process of modulating then demodulating the data from analogue to digital and then visa versa.