File Name: non return to zero and return to zero ppt to .zip
The numerical relay Lecture 4 - Power System Protection.
Return-to-zero RZ or RTZ describes a line code used in telecommunications signals in which the signal drops returns to zero between each pulse. This takes place even if a number of consecutive 0s or 1s occur in the signal. The signal is self-clocking. This means that a separate clock does not need to be sent alongside the signal, but suffers from using twice the bandwidth to achieve the same data-rate as compared to non-return-to-zero format.
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A line code is the code used for data transmission of a digital signal over a transmission line. This process of coding is chosen so as to avoid overlap and distortion of signal such as inter-symbol interference. As the coding is done to make more bits transmit on a single signal, the bandwidth used is much reduced. In this type of unipolar signaling, a High in data is represented by a positive pulse called as Mark , which has a duration T 0 equal to the symbol bit duration. A Low in data input has no pulse.
Data can be represented either in analog or digital form. The computers used the digital form to store the information. Therefore, the data needs to be converted in digital form so that it can be used by a computer. Digital-to-digital encoding is the representation of digital information by a digital signal. When binary 1s and 0s generated by the computer are translated into a sequence of voltage pulses that can be propagated over a wire, this process is known as digital-to-digital encoding. If a bit is 0 or 1, then their voltages will be positive and negative respectively. Therefore, we can say that the level of the signal is dependent on the state of the bit.
Binary Line Coding. There are two major categories: return-to-zero (RZ) and nonreturn-to- zero (NRZ). With RZ coding, the waveform returns to a zero-volt level.
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Nonreturn to Zero-Level (NRZ-L). Two different voltages for 0 and 1 bits; Voltage constant during bit interval. no transition I.e. no return to zero voltage.
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