An electronic 2-wire private branch exchange

This paper describes the system organization utilized in electronic private branch exchanges (PBXs) presently in production. It briefly reviews a switchboard already installed and discusses basic design philosophy. Typical system specifications are given and the relationship of the voice transmission path to the common control is examined, along with a step-by-step description of the common control; the paper concludes with an outline description of the electronic private branch exchange (EPBX) installed at Ripon, Wis.