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Differential Manchester encoding (also known as CDP; Conditional DePhase encoding) is a method of encoding data in which Data and Clock Signal s are combined to form a single self- Synchronizing Data Stream . It is a Differential Encoding , using the presence or absence of transitions to indicate logical value. This gives it several advantages over vanilla Manchester Encoding :
Data is encoded by the presence or absence of a transition at the beginning of a bit period. Every bit period has at least one transition, in the middle of the period, regardless of the bit being transmitted. Generally a space (logical 0) is represented by the presence of a transition at the beginning of the period, with a mark (logical 1) represented by the lack of a transition. A reversed scheme is possible, and no advantage is given by using either scheme. A related method is Manchester Encoding in which the meaningful transitions are the mid-bit ones, and these encode data by their direction (positive-negative is one value, negative-positive is the other). Differential Manchester is specified in the IEEE 802.5 standard for token ring LANs, and is used for many other applications, including magnetic and optical storage. Note: In differential Manchester encoding, if a "1" is represented by one transition, a "0" is represented by two transitions, and vice versa. Source: from Federal Standard 1037C |
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