This parcel, formally called a bit-symbol, includes the logical inverse of the encoded bit followed by the actual value of the encoded bit, so that there is always a signal transition in the middle of the bit-symbol. For example, the bit “0” would be encoded in Manchester as the bit-symbol “01.” This seems silly, since it appears to double the amount of work required to send a bit of data, but just like differential signaling, it is useful in long-distance communications. Its biggest disadvantage is that it generates signal changes on the wire twice as fast as the data rate, which makes the
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