| 单词 | Manchester coding |
| 释义 | Manchester coding A technique for encoding both the clock and data pulses into a self-synchronizing bit stream. Manchester coding does not send data as a series of raw 1 bits and 0 bits. Rather, each data bit includes a midpoint voltage level transition from positive (+) to negative (–) or from negative (–) to positive (+), with the direction of the transition indicating whether the bit is a 1 bit or a 0 bit. The fact that each bit representation includes both a positive and a negative pulse ensures pulse density and, therefore, ensures proper synchronization.This characteristic also maintains DC balance on the line. Sometimes referred to as phase encoding (PE) and biphase encoding, Manchester coding is a special case of binary phase-shift keying (BPSK). Manchester coding is specified in early versions of IEEE 802.3, also known as Ethernet, and 802.4, also known as token bus. In contemporary high speed networking, more efficient coding schemes, such as 4B/5B and 8B/10B, largely have replaced Manchester coding, which requires two pulses (+/– or –/+) for each data bit. See also 4B/5B, 802.3, 802.4, 8B/10B, BPSK, Ethernet, line coding, ones density, phase, pulse, synchronous, and Token Bus. |
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