Difference between revisions of "Microduino-Module RJ45"

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Revision as of 13:37, 15 February 2014

Microduino-RJ45

Microduino-RJ45 must be stacked with Microduino-ENC28J60 together to form a complete Ethernet module, individual module cannot be used separately.

RJ45 is the most popular Ethernet jacket, used for data transportation and communication.

The "RJ45" physical connector is standardized as the IEC 60603-7 8P8C modular connector with different "categories" of performance, with all eight conductors present but 8P8C is commonly known as RJ45. The physical dimensions of the male and female connectors are specified in ANSI/TIA-1096-A and ISO-8877 standards and normally wired to the T568A and T568B pinouts specified in the TIA/EIA-568 standard to be compatible with both telephone and Ethernet.

Features

Specifications

Microduino-ENC28J60 Spec


Documents

Development

Applications

Buy

Pictures

Microduino RJ45 Front
Microduino RJ45 Back

History

  • 起源:
    • RJ这个名称代表已注册的插孔(Registered Jack),是来源于贝尔系统的USOC (Universal Service Ordering Codes,通用服务分类代码) 代码。USOC 是一系列已注册的插孔及其接线方式,是由贝尔系统开发的,用于将用户的设备连接到公共网络。FCC 规定控制着这一目的的应用。FCC (联邦通信委员会)代表美国政府发布了一个文档规定了RJ11。
    • RJ11是用于西部电子公司(Western ElectricCo)开发的接插件的通用名称。其外形定义为6针的连接器件。原名为WExW, 这里的x表示‘活性’,触点或者打线针。例如, WE6W 有全部6个触点,编号1到6, WE4W 界面只使用4针最外面的两个触点(1和6) 不用,WE2W 只使用中间两针。对于RJ11,信息来源是矛盾的,它可以是2或者4芯的6针接插件。更加混淆的是,RJ11并不仅是用于代表6针接插件,它还指4针的版本。
    • RJ45 和RJ11:不同的标准,不同的尺寸
    • 由于两者的尺寸不同(RJ11为4或6针,RJ45为8针连接器件),显然RJ45插头不能插入RJ11插孔。反过来却在物理上是可行的(RJ11插头比RJ45插孔小), 由此让人误以为两者应该或者能够协同工作。实际上不是这样。强烈建议不要将RJ11插头用于RJ45插孔。
    • 因为RJ11不是国际标准化的,其尺寸,插入力度,插入角度等等没有统一依照国际标准接插件设计要求,因此不能确保能够具有互操作性。它们甚至引起两者的破坏。由于RJ11插头比RJ45插孔小,插头两边的塑料部分将会损坏插入的插孔的金属针。