Regenerator (telecommunication)

A regenerator in a telecommunications context is a type of repeater that is used in copper line or optical fibre line transmission systems. The regeneration function involved also appears in other types of systems, e.g. computer networking systems.

A digital signal travelling a significant distance will become weaker and distorted and require periodic help to continue its journey successfully.

A simple amplifier will only increase the amplitude of the signal and will not correct the distortion of the waveform shape.

A threshold detector can be used to correct the amplitude levels although the exact time that the transition occurs may not be in the right place. This timing inaccuracy is referred to as jitter.

A regenerator includes circuitry to recover the clock timing information, which is then used to determine when the output signal switches its state. This ensures that the recovered data from the threshold detector is adjusted to provide the correctly timed signal output.

Notes
    gollark: And that would... probably be worse than the central version.
    gollark: Well, it has to be decryptable by payment terminals, so that's useless.
    gollark: Anyway, pretty much the only secure way to do this magcard thing would be... having payment terminals bother a central server, and even that would have problems.
    gollark: (that's probably a metaphor for life somehow)
    gollark: I'm not sure tying your currency to Krist is a good idea. Krist has really weird wealth distribution because mining was fifty times more profitable before.

    References
    1. Edis E A & Varrall J E, Newes Telecommunications Pocket Book (Butteworth-Heinemann, 1992) ISBN 0-7506-0307-0
    2. Bissell C C & Chapman D A, Digital Signal Transmission (University Press Cambridge, 1992) ISBN 0 521 42557 3
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