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How to Identify the Different Ends of a USB Cable

USB cables have two ends, and each end can be different. On one end of the cable is the A connector. The other end, most likely, has the B connector.

The A connector is rectangular. It's what plugs into the computer. This connector is often called the upstream end.

The B connector has a D shape to it. This type of hole and cable connector is fitted on USB devices. It's called the downstream end.

For example, to connect a USB printer, you plug the A end of the cable into your laptop and the B end into the printer. Ta-da!

Here are some things to remember when buying a USB cable:

  • When you get a USB cable, you want a USB A-to-B cable.

  • If you want a USB extension cable, you want a USB A-to-A cable, or one that’s labeled as an extension.

  • You can get other cable ends as well, although they’re specific to the devices they plug into. For example, some MP3 players use a special USB cable with an A connector on one end and a specific dongle on the other end that plugs only into the MP3 player.

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