FORGRENINGSENHET FOR ATT HOPKOPPLA TVA GRENLEDNINGAR

摘要

A synchronous multipoint data network is formed by symmetrical junction units. Each junction unit provides signal paths that interconnect two-way branch lines which extend to station line loops or are connected to branch lines of other junction units. Data signals from any branch are broadcast by the junction unit to all other branches. If data signals are simultaneously received from two branches, an exclusive two-way connection is formed therebetween and the interconnections to the nonactive branches are severed. The junction unit also generates "idle" control words and sends them to nonactive branches when an exclusive interconnection is formed.