Title: Small modular communications switching system with distributed programmable control

Abstract: A telephone central office switching system with economical application to small community dial office sizes is disclosed. Communication paths are spatially switched over a modular network fabric comprised of electromechanically actuated metallic crosspoints. A distributed control concept is employed wherein the logic power and flexibility of electronic stored program control is spread over many points in the system. Serial asynchronous messages between any two control elements are routed via a central information exchange unit whose number of communication ports is easily changed on a pluggable basis. Modularity is emphasized throughout the switching system for facile growth and additions of feature-oriented service packages.

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Inventors: Cheney, Thomas K. (Prospect, OH, US)
Kuczura, Anatol (Worthington, OH, US)

Application Number: 540077
Filing Date: 1975-01-10
Publication_date: 1976-08-10
Assignee: North Electric Company (Galion, OH)
Primary Class(es): 379/244 379/245, 379/269, 379/380
Other Classes:
US Patent Ref:

3483524	Dec, 1969	De Buck et al.	340/172.
3553384	Jan, 1971	Lucas et al.	179/18.
3749844	Jul, 1973	Dufton	179/18.

Other Refs:
Primary Examiner: Brown, Thomas W.
Assistant Examiner:
Attorney: Johnson, Dienner, Emrich & Wagner