By C. Balanis [SOLUTIONS] [non-OCR]

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Sample text

This effect gives delay line decoders only half of the jitter rejection which should be possible. Phase locked loops are the commonest type of clock recovery mechanism today; the two types in use are analogue and digital. An analogue phase locked loop has an internal oscillator which is voltage controlled, that is a voltage controls the frequency at which it runs. A mid voltage level causes it to run at about the frequency of the clock to be recovered so that it may run faster or slower as necessary.

The effect is most noticeable when a stream of narrow pulses is followed by a wide pulse or when a stream of wide pulses is followed by a narrow one. Taking the latter case as an example, the wide pulses being less affected by attenuation achieve a large amplitude. A narrow pulse however has insufficient time to reach the same amplitude. 6 shows a simulation of a balanced transmission line exibiting intersymbol interference. Two overlaid Manchester encoded signals at the end of the transmission line are shown to illustrate the phase and amplitude distortion.

1 is an attempt to do this by plotting the points at which different LAN types achieve volume usage on mass market equipment. It is fairly subjective but gives an idea of the trend. The point representing the introductory phase of a LAN often lies above this line with a bit rate which is relatively high. The per attachment cost is generally high and the end stations tend to be costly or specialised such as graphics workstations or mainframe computers. 1 Data rates through the years rate, or may be specifically designed for low cost with a low data rate as one of the tradeoffs to achieve this.

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