The invention permits multiple secondary stations to be connected in a multipoint communication network to a single primary station utilizing point-to-point interfaces such as the standard RS-232 or V.35 which do not ordinarily support multipoint connections. A primary station is connected to one secondary...http://www.google.com/patents/US4723120?utm_source=gb-gplus-sharePatent US4723120 - Method and apparatus for constructing and operating multipoint communication networks utilizing point-to point hardware and interfaces
