The present invention, generally speaking, uses input buffering and output control to provide a high-speed, high-performance digital traffic switch. Dropped discrete information units (cells) are dropped at the input port, and so will not be transmitted across the switch fabric. This reduces the traffic...http://www.google.de/patents/US5768257?utm_source=gb-gplus-sharePatent US5768257 - Input buffering/output control for a digital traffic switch
