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[USB] 请教:USB2.0 白绿一定要对绞吗?
P:2009-08-13 10:52:21
7
USB2.0 版本的FULL SPEED 和 HIGH SPEED 是一定要求对绞的;
请参阅标准规范资料。
MC2 cable - MC2电缆,现代同轴电缆(美国Trilogy通信公 司生产的具有竹节式半空气绝缘结构的低损耗高强度电视电缆,使用寿命超过50年,具有独特的防水性能。MC2为商品名称,来源于爱因斯坦的相对论。爱氏提出,物体的能量和质量之间有着严格的比例关系,即E=MC2,这就是有名的质能方程。MC2还有另一种解说,即同轴电缆英文是coaxial cable,这两个词的第一个字母均为C,故谓C的平方。而M即为Modern的头一个字母。) (0) 投诉
P:2009-08-13 16:16:30
12
6.3 Cable
USB cable consists of four conductors, two power conductors, and two signal conductors.
High-/full-speed cable consists of a signaling twisted pair, VBUS, GND, and an overall shield. High-/fullspeed
cable must be marked to indicate suitability for USB usage (see Section 6.6.2). High-/full-speed
cable may be used with either low-speed, full-speed, or high-speed devices. When high-/full-speed cable is
used with low-speed devices, the cable must meet all low-speed requirements.
Low-speed recommends, but does not require the use of a cable with twisted signaling conductors.
标准规范的内容!!
quantity of radiation - 辐射量 (0) 投诉
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