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A comment on Apple Reveals New iPhone Connector Port. Parent comment

Re:Apple Reveals New iPhone Connector Port by Turing_Machine on Friday June 22, 2012 @10:55AM (#4146979)
USB is only 4 wires. The 30 pin connector has a lot more signals available than that:

http://pinouts.ru/PortableDevices/ipod_pinout.shtml

Yes, you can sync and charge the device using only the USB wires, but some accessories use the others.

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