A paging network is disclosed which utilizes a plurality of distributed switches to transmit pages on a non-real time basis to achieve efficient and low cost transmission. Each of the switches processes packets of pages received from the network. Each of the switches also processes pages into packets...http://www.google.com/patents/US4881073?utm_source=gb-gplus-sharePatent US4881073 - Paging system with dynamically programmable reception frequencies
