By William Stallings
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Additional info for Data and Computer Communications
This protocol is implemented not only in the end systems but also in routers. A router is a processor that connects two networks and whose primary function is to relay data from one network to the other on its route from the source to the destination end system. Regardless of the nature of the applications that are exchanging data, there is usually a requirement that data be exchanged reliably. That is, we would like to be assured that all of the data arrive at the destination application and that the data arrive in the same order in which they were sent.
In the case of acoustic data (voice), the data can be represented directly by an electromagnetic signal occupying the same spectrum.
Simplex" is used to correspond to half-duplex, as defined above, and "duplex" is used to correspond to full-duplex, as also defined above. Frequency, Spectrum, and Bandwidth In this book, we are concerned with electromagnetic signals, used as a means to transmit data. 2, a signal is generated by the transmitter and transmitted over a medium. The signal is a function of time, but it can also be expressed as a function of frequency; that is, the signal consists of components of different frequencies.