zoukankan      html  css  js  c++  java
  • 曼彻斯特码(From Wikipedia )

    曼彻斯特码(From Wikipedia )

    Manchester code

    Manchester code (also known as Phase Encoding, or PE) is a line code in which the encoding of each data bit has at least one transition and occupies the same time. 

    It is self-clocking, which means that it may be inductively or capacitively coupled, and that a clock signal can be recovered from the encoded data. 

    Manchester code is widely used (e.g. in Ethernet; see also RFID or Near Field Communication). 

    Features

    Manchester code ensures frequent line voltage transitions, directly proportional to the clock rate; this helps clock recovery.

    The DC component of the encoded signal is not dependent on the data and therefore carries no information, allowing the signal to be conveyed conveniently by media (e.g. Ethernet) which usually do not convey a DC component.

    Description

    wps_clip_image-6070

    wps_clip_image-16676

    Summary:

    Each bit is transmitted in a fixed time (the "period").

    A 0 is expressed by a low-to-high transition, a 1 by high-to-low transition (according to G.E. Thomas' convention -- in the IEEE 802.3 convention, the reverse is true).

    The transitions which signify 0 or 1 occur at the midpoint of a period.

    Transitions at the start of a period are overhead and don't signify data.

  • 相关阅读:
    phpdocumentor生成代码注释文档(linux)
    phpstorm扩展
    es教程
    康威定律
    k8s
    tidb调研
    netty 在线教程
    McQueenRPC源码阅读
    DIY一些基于netty的开源框架
    性能测试
  • 原文地址:https://www.cnblogs.com/sleepy/p/2163991.html
Copyright © 2011-2022 走看看