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8P8C

8P8C的插头以及引脚编号(以100Base-T4为例):
引脚 名称 功能
1. TX_D1+ (发送数据+)
2. TX_D1- (发送数据-)
3. RX_D2+ (接收数据+)
4. BI_D3+ (双向数据+)
5. BI_D3- (双向数据-)
6. RX_D2- (接收数据-)
7. BI_D4+ (双向数据+)
8. BI_D4- (双向数据-)
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8P8C,或称为RJ45[1],是以太网使用双绞线连接时常用的一种连接器插头。

8P8C(8 position 8 contact)的意思是8个位置(Position,指8个凹槽)、8个触点(Contact,指8个金属接点)。

连线颜色

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T568A中,与之相连的8根线分别定义为:白绿、绿;白橙、蓝;白蓝、橙;白棕、棕。在T568B中,与之相连的8根线分别定义为:白橙、橙;白绿、蓝;白蓝、绿;白棕、棕。其中橙白色和橙色组成一对差分传输线,绿白色和绿色组成一对差分传输线,蓝白色和蓝色组成一对差分传输线,棕白色和棕色组成一对差分传输线。T568A可以跟早期的USOC向下兼容。

连线信号

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百兆以太网Fast Ethernet、10/100M Ethernet)中,仅使用1、2、3、6这四根线,以差分信号传输方式减少电磁干扰,其中1、2为TX(发送)(拧在一起),3、6为RX(接收)拧在一起。因此平行线就是两端同为EIA-568-A或者EIA-568-B,而跳线就是一端使用EIA-568-A,另一端使用EIA-568-B的连接方法。

千兆以太网Gigabit Ethernet、1000M Ethernet)或者以太网供电PoE, Power over Ethernet)中,全部的四对差分对都被使用。

一个未压入电缆的8P8C插头
一个插头与电缆安装后的8P8C插头

参见

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参考文献

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  1. ^ History of the RJ45. [2020-08-13]. (原始内容存档于2018-07-05). 
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8P8C
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