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This means many USB-A–to–USB-C cables will only work in the A to C direction (connecting to a USB-C devices, e.g. for charging) as they do not include the termination resistors needed to work in the C to A direction (from a USB-C host). Adapters or cables from USB-C to a USB-A receptacle usually do work as they include the required ...
USB-C cables can carry more power so laptops can be charged faster, and they enable faster data transfer speeds, allowing a big trove of files to be copied from a computer to an external hard drive.
Charging docks supply power and do not include a host device or data pins, allowing any capable USB device to charge or operate from a standard USB cable. Charging cables provide power connections, but not data. In a charge-only cable, the data wires are shorted at the device end, otherwise, the device may reject the charger as unsuitable.
New-to-existing cables and adapters have been defined. Some USB Type-C cables and connectors can support "USB performance at SuperSpeed USB 10 Gbps (USB 3.1) and USB Power Delivery up to 100W" [19] [20] [21] although USB Type-C cables are only required to support USB 2.0 (non-SuperSpeed) data rates and 3 A (60 W at 20 V) of current. [22]
Charging docks supply power, and do not include a host device or data pins, allowing any capable USB device to charge or operate from a standard USB cable. Charging cables provide power connections but not data. In a charge-only cable, the data wires are shorted at the device end; otherwise, the device may reject the charger as unsuitable.
All smaller electronic devices will be required to use the same charging cable, including Apple’s iPhone, which does not currently use USB-C.
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