USB 3.0连接是否需要USB 3.0电缆？

If you are new to the world of USB 3.0, then you may have plenty of questions about the cables you can and/or should use with USB 3.0 enabled devices. With that in mind, today’s SuperUser Q&A post helps a curious reader learn the “ins and outs” of USB 3.0.

如果您不熟悉USB 3.0，那么对于可以和/或应该与启用USB 3.0的设备一起使用的电缆，您可能会有很多疑问。 考虑到这一点，今天的SuperUser Q＆A帖子可帮助好奇的读者学习USB 3.0的“来龙去脉”。

Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites.

今天的“问答”环节由SuperUser提供，它是Stack Exchange的一个分支，该社区是由社区驱动的Q＆A网站分组。

Photo courtesy of Xiao Zong Zong (小宗宗 – Flickr).

照片由小宗宗–小宗宗提供 。

问题 (The Question)

SuperUser reader Xavierjazz wants to know if USB 3.0 connections require USB 3.0 cables in order to reach their full speed potential:

超级用户阅读器Xavierjazz想知道USB 3.0连接是否需要USB 3.0电缆才能发挥其最大速度：

Do USB 3.0 connections require USB 3.0 cords to reach USB 3.0 speeds? Will any USB cord support any USB 3.0 device?

USB 3.0连接是否需要USB 3.0电缆才能达到USB 3.0速度？ 是否有任何USB线支持任何USB 3.0设备？

Do USB 3.0 connections require USB 3.0 cables in order to reach their full speed potential?

USB 3.0连接是否需要USB 3.0电缆才能发挥最大速度？

答案 (The Answer)

SuperUser contributors Steven and fixer1234 have the answer for us. First up, Steven:

超级用户贡献者Steven和fixer1234为我们找到了答案。 首先，史蒂文：

A USB 3.0 cable is required for USB 3.0 speeds, but any USB cord will make a connection.

USB 3.0速度需要USB 3.0电缆，但是任何USB电缆都会建立连接。

Source 1: USB [Wikipedia]

来源1： USB [Wikipedia]

SuperSpeed (USB 3.0) is supported only by USB 3.0 and newer interfaces, and requires a connector and cable with extra pins and wires, usually distinguishable by the blue inserts in connectors.

只有USB 3.0和更新的接口才支持SuperSpeed(USB 3.0)，并且需要带有额外插针和电线的连接器和电缆，通常可以通过连接器中的蓝色插入物来区分它们。

Source 2: USB 3.0 Super Speeds [USRobotics]

来源2： USB 3.0超高速 [USRobotics]

USB 3.0 cables can be used with 2.0 devices and ports if the connector types fit (no B Male or B Micro connectors), but the transfer rate will fall back to 2.0.

如果连接器类型合适(无B Male或B Micro连接器)，则USB 3.0电缆可与2.0设备和端口一起使用，但传输速率将降至2.0。

Source 3: Are USB 3.0 cables different? [UserBenchmark]

来源3： USB 3.0电缆是否不同？ [UserBenchmark]

To get USB 3.0 speeds, you need special USB 3.0 cables. Yes, USB 3.0 cables are different. Even though you can connect a USB 3.0 device via a USB 2.0 cable, in order to achieve full USB 3.0 speeds you need to rewire any existing cabling. USB 3.0 cables have more internal wires, are usually blue, and are noticeably thicker than the old USB 2.0 cables. We figured this out the hard way during the USB flash drive group test.

要获得USB 3.0速度，您需要特殊的USB 3.0电缆。 是的，USB 3.0电缆不同。 即使您可以通过USB 2.0电缆连接USB 3.0设备，但要获得完整的USB 3.0速度，您仍需要重新连接所有现有电缆。 USB 3.0电缆的内部电线更多，通常为蓝色，并且比旧的USB 2.0电缆明显更粗。 我们在USB闪存驱动器组测试中找到了解决方法 。

Followed by the answer from fixer1234:

随后是来自fixer1234的答案：

You cannot achieve USB 3.0 speeds without a USB 3.0 cable. However, speed is not the only issue.

如果没有USB 3.0电缆，则无法达到USB 3.0速度。 但是，速度不是唯一的问题。

A USB 2.0 cable will work (at USB 2.0 speeds), for some, but not all, USB 3.0 devices. There are at least three important differences in cable construction between the two standards.

对于某些但不是全部USB 3.0设备，USB 2.0电缆可以工作(以USB 2.0速度)。 两种标准之间在电缆构造方面至少存在三个重要区别。

Related to Speed:

与速度有关：

• USB 3.0 cables have nine internal conductors versus four in USB 2.0 cables.
  USB 3.0电缆有9条内部导体，而USB 2.0电缆有4条。

Four of the nine internal conductors match the USB 2.0 configuration (two are for power and two are for signal). Connecting a USB 3.0 device with a USB 2.0 cable uses those conductors and operates like a USB 2.0 device.

九个内部导体中的四个与USB 2.0配置匹配(两个用于电源，两个用于信号)。 将USB 3.0设备与USB 2.0电缆连接起来会使用这些导体，并且其操作方式类似于USB 2.0设备。

The other five are signal conductors which are used for the communication method that provides USB 3.0 super speed. A good general description can be found here: USB 3.0 [Wikipedia]

其他五根是信号导体，用于提供USB 3.0超高速的通信方法。 可以在此处找到良好的一般描述： USB 3.0 [Wikipedia]

• USB 3.0 cables have a limit of three meters versus the USB 2.0 limit of five meters.
  USB 3.0电缆的限制为三米，而USB 2.0电缆的限制为五米。

(Note that this is a practical limit.) The cable can be any length as long as it meets all of the electrical requirements in the specification. The three meter limit is based on maximum allowable losses using the largest recommended wire size so that the cable is flexible. Specs Document [Zip File – USB.org]

(请注意，这是实际限制。)电缆可以为任何长度，只要符合规范中的所有电气要求即可。 三米限制是基于使用最大推荐电线尺寸的最大允许损耗而确定的，以便使电缆灵活。 规格文档 [Zip文件– USB.org]

Related to Power:

与电源有关：

• A USB 2.0 cable may not be adequate for a high current USB 3.0 device.
  USB 2.0电缆可能不适用于高电流USB 3.0设备。

Some USB 3.0 devices draw more power than USB 2.0 devices. The power conductors in USB 3.0 cables need to be able to carry 900 mA versus 500 mA for USB 2.0 cables.

某些USB 3.0设备比USB 2.0设备消耗更多功率。 USB 3.0电缆中的电源导线必须能够承受900 mA的电流，而USB 2.0电缆则需要500 mA。

Additional information on USB 3.0 versus 2.0 can be found here: USB 2.0 vs. USB 3.0 [Diffen]

有关USB 3.0与2.0的更多信息，请参见： USB 2.0与USB 3.0 [Diffen]

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Have something to add to the explanation? Sound off in the comments. Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here.

有什么补充说明吗？ 在评论中听起来不错。 是否想从其他精通Stack Exchange的用户那里获得更多答案？ 在此处查看完整的讨论线程 。

翻译自: https://www.howtogeek.com/222400/do-usb-3.0-connections-require-usb-3.0-cables/