For slow speed transmission, this method of pulse code format is the most effective and reliable. In full binary bipolar return to zero formats, the typical speed is around 600 bits. Here to transmit 1 and 0 bits, frequency shift keying is employed. The opposite polarity pulses transmits 1 and 0 bits. Power transmission between pulses is negligible. In the non-return to zero unipolar type of transmission, pulses are spread out in time so that they occupy the full time slot and permit an increasing rate of transmission. Here pulses never return to zero between successive pulses of 0 and 1. This technique is extensively employed in serial computer applications and for high speed data transmission.
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