Apparatus is used in communicating in a data and voice communication system. The apparatus includes a line card and a crosspoint switch in communication with the line card. The apparatus also includes an accelerator card in communication with the line card and the crosspoint switch. The crosspoint switch...http://www.google.de/patents/US7558193?utm_source=gb-gplus-sharePatent US7558193 - Redundancy in voice and data communications systems
