A Local Area Network (LAN) is a digital communications network interconnecting serial local computer workstations. The invention provides a technique for interconnecting two or more remote LAN's. In a specific embodiment the LAN's are IBM Token Rings in which case the notion of a virtual or pseudo ring...http://www.google.de/patents/US4901312?utm_source=gb-gplus-sharePatent US4901312 - Remote interconnection of local area networks
