Promethean boards with longer USB connections
We are shortly switching to laptops for our classroom PC's so any exiting serial connections will be a no go. Almost all our exisiting boards have the serial connections although all the one's I've looked at also have the USB option as well. I'm looking at runs of 7-8 metres on most of our boards. I've read up on the forums and as expected 5m is the longest a USB cable will go on it's own, so it looks like an active 5m usb ext (+ short standard USB lead) or an usb to ethernet adaptor will be needed. Will this alone be enough to power the board and provide a reliable connection? I've read some people have connected via a usb cable and have also left the power supply adapter plugged into the old serial connection, but surely the USB connection can provide the power? I've done a quick test with a laptop just using a short USB connection, but of course I don't know if this is reliable, especially as I'll be running over longer distances.