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I want to suspend a connected USB device at my pc manually. I tried the following instructions in Debian (Kernel 3.2.0).

uname output:

Linux debian7-dev-gnome 3.2.0-4-686-pae #1 SMP Debian 3.2.57-3+deb7u2 i686 GNU/Linux

I want to suspend the following device:

Bus 001 Device 003: ID 0403:6011 Future Technology Devices International, Ltd FT4232H Quad HS USB-UART/FIFO IC

echo -n "1-0:1.0" > /sys/bus/usb/drivers/hub/unbind //for suspend
echo -n "1-0:1.0" > /sys/bus/usb/drivers/hub/bind //for resume

After the unbind function the device disappears from lsusb, but I'm not sure if it is in suspend or just removed from the system without loosing power supply.

How can I suspend the USB device #3 at bus #1?

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You can try echo -n "suspend" > /sys/bus/usb/drivers/hub/1-0:1.0/power/level to suspend the said usb device

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