Switch mobil phone off via USB

[jawor]

I have attached my mobile phone to PC via USB.  Phone is charged from PC (usb), but If I want to reset my phone, I need to use PDU (power distribution unit) which is controled from PC by TCP/IP packets. Red wire in USB cable is 'transferring' voltage. I divided it in power breaker which is connected to PDU. If I switch voltage off in PDU, transystor is opened in Power breaker and voltage from PC dont get tu my phone by red wire , and phon is switched off/restarted. I want to do the same without Power breaker and PDU, I need to know how can I avoid 'transferring' voltage by red wire it means how i can switch my phon off from my PC without Power breaker. Is this possible to stop all voltage in USB port??
At my work my mates told my that only one way to switch phon off is to use pdu and pd.

->I dont want to use phone soft to restart, becouse this solution must be universal. I need to make 'hard restart'

Sorry for mistakes.

[jawor]

oks i know why. When phone is hanged up, computer can't see Phone thats why i cant use USB port to disable cell phone - port is invisbible. is this posible to restart phone?

[Jan Axelson]

Applications don't have the ability to control power on USB ports.

Jan

[Bret]

Windows applications may not have the ability to control power, but DOS applications may if they use my drivers (http://bretjohnson.us).  It depends on the hub hardware, though.  Some hubs have per-port power switching, some have ganged power switching (switching power on or off to one port also switches power on or off to all of the other ports at the same time), and some don't have any type of power switching at all.  If you want something that you know will always work, you'll need to institute an external, hardware-based solution like you are now.

[jawor]

thx for help, it means I need to do any hardware:)