Explain the two common biphase schemes, Manchester and Differential Manchester
What will be an ideal response?
Manchester is used in Ethernet and other LANs, whereas Differential Manchester is used in token ring LANs. With Manchester, the direction of the transition in mid-interval, negative to positive or positive to negative, indicates the binary bit value. For a 1 bit, the transition is always from negative to positive; for a 0 bit, it is from positive to negative. This mid-bit transition serves not only to represent data, but also provides clocking. With Differential Manchester, the presence or absence of a transition at the beginning of a bit interval indicates the bit value. The transition in mid-interval is used only for self-clocking, not to provide data, which is an advantage.
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