The pull multiplexer receives upstream requests and cull out MPEG or other compressed video packets, IP...http://www.google.com.au/patents/US7089577?utm_source=gb-gplus-sharePatent US7089577 - Process for supplying video-on-demand and other requested programs and services from a headendAdvanced Patent SearchPublication numberUS7089577 B1Publication typeGrantApplication numberUS 09/602,779Publicati