In my days at iBurst we using a number of Cisco P-cubes to prevent congestion on the wireless towers. The iBurst connection was able to squeeze approximately a measly 1 Mb/s out of a modem and any excessive use of P2P, especially bittorrent, on the towers would kill the user experience. The solution was manged by someone we called the ninja, so called because one moment he would be at his desk and the next gone. We always thought he has secret routes through the air conditioning ducts of the building. Like many Cisco products the P-cubes have been flushed into the abyss of Cisco acquisition discards with the current market leader in the sector being Sandvine.
Read the article on LinkedIn over here.