以太网技术特征
常用称谓
connectors
码率
连接
标准
Page 3
10/100/1000BASE-T 连接器引脚排列
TD/RD: Transmit Data/Receive Data BI_D x : Bi-directional Pair x
Computer RJ45 / 8P8C connector
10BASE-T
测试项目描述
参考规范
手持式按摩器规范要求的测试内容
100BASE-TX
rise/fall time symmetry 测试项目描述参考规范
双生筷规范要求的测试内容
1000BASE-T
测试项目描述
First signal in auto-negotiation to test link connectivity. Sent every 16ms until a response is received.
Sent at the end of data packet to indicate end of transmission. Pulse width is 300 or 350ns depending on whether the last bit was ‘0’or ‘1’.
布袋弹Differential Manchester encoded signal with pre-emphasis.
All ‘1’s Manchester encoded signal, essentially a 5 MHz signal. Used in harmonic test to ensure all harmonics are 27 dB down from the fundamental.
100BASE-TX 测试码型Random Data
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1000BASE-T 测试码型
•1000BASE-T 数据经过4b/5b 编码保持链路DC 平衡和足够的边沿进行CDR 数据的时钟源Test Mode 1
Test Mode 4
Test Mode 2/3
如何获得Ethernet 测试码型
10/100/1000BASE-T 设备输出测试码型方法是半导体芯片供应