Some usb ports and external hubs can in practice supply more power to usb devices than required by the.
Non data usb cable.
This is also why the data cable can be charged and the charging cable does not necessarily work as a data cable.
Hence is no good reason to keep the vcc line disconnected.
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The cables also feature a woven protective mesh underneath the rubberized plastic sheath to give them the durability and strength to stand up to daily use.
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The tinned copper wiring construction ensures a quick stable charge and fast data transfer.
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The usb standard provides for notifying the device that it can fast charge if it sees that the data pins on the device end of the cable are shorted together.
Because the usb implementers forum doesn t have any rule enforcing usb manufacturers to label or differentiate charge only cables from data transfer cables it is almost impossible to tell them apart.
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Each cable measures six feet long to give you a long reach from a wall outlet or usb port.
If the cable connectors have the usb logo on them those cables have to be compliant with usb standard which in turn means that all pins have to be connected.
Even if only data shall be transmitted at least data lines and gnd are required see usb 2 0 spec.
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Such devices can use an external power supply which is allowed by the standard or use a dual input usb cable one input of which is for power and data transfer the other solely for power which makes the device a non standard usb device.
However there are still some proven ways to find out if a usb cable is charge only or supports data transfer.
A broad variety of usb hardware exists including several different connectors of which usb c is the most recent.