Technical Engineering Definitions
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Manchester code: A code in which (a) data and clock signals are combined to form a single self synchronizing data stream, (b) each encoded bit contains a transition at the midpoint of a bit period, (c) the direction of transition determines whether the bit is a '0' or a '1', and (d) the first half is the true bit true bit value.
Manchester Encoding
Manchester Encoding Manchester Encoding translates a '1' into a low to high transition [01], and a '0' is translated into a high to low transition [10]. Also called Biphase Code. Used with the Ethernet interface.
Manchester Encoding
The waveform diagram above shows Manchester Data Encoding per IEEE-802.3, as in Ethernet.
Manchester Encoding
The waveform diagram above shows Manchester Data Encoding per two different encoding standards. Note that some encoding formats use a high to low transition to indicate a logic 1, while other may use a low to high transition. The transmitted bit pattern remains the same in both cases, but is inverted.
In addition to Ethernet MIL-STD-1553, and MIL-STD-1397 also use Manchester II Encoding, Bi-Phase L.
Differential Manchester Encoding
Differential Manchester Encoding: Encoding in which data and clock signals are combined to form a single self-synchronizing data stream, one of the two bits, i.e., '0' or '1', is represented by no transition at the beginning of a pulse period and a transition in either direction at the midpoint of a pulse period, and (c) the other is represented by a transition at the beginning of a pulse period and a transition at the midpoint of the pulse period. Note: In differential Manchester encoding, if a '1' is represented by one transition, a '0' is represented by two transitions, and vice versa.
