Title: Subscriber monitoring unit for electronic telephone exchanges

Abstract: The monitoring peripheral equipment is intended to inform the exchange's central unit about the state and nature of the subscriber's receiver and it comprises: a circuit sensing the positions of the relays of the line equipment, a memory unit, an internal logic with a scanner thereof, a liaison circuit logic and a line equipment monitoring device, whereby the lifting of a subscriber's receiver is detected, the information is sent to the internal logic as regards the location, state and processing to be performed, said central unit calls back said liaison circuit logic and the internal logic sets the subscriber's telephone in the connected position.

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Inventors: Baudoin, Michel (Saint-Prix, FR)

Application Number: 709091
Filing Date: 1976-07-27
Publication_date: 1977-07-12
Assignee: Societe Francaise des Telephones Ericsson (Colombes, FR)
Primary Class(es): 379/27.01 379/280
Other Classes:
US Patent Ref:

3136863	Jun, 1964	Melvin	179/18.
3524933	Aug, 1970	Risky	179/18.
3560655	Feb, 1971	Lucas	179/18.
3562436	Feb, 1971	Lutgenau	179/18.
3673340	Jun, 1972	Casella et al.	179/18.
3697701	Oct, 1972	Greason et al.	179/18.
3740485	Jun, 1973	Nickerson	179/18.
3770899	Nov, 1973	Kobus et al.	179/18.
3920934	Nov, 1975	Moorehead	179/175.

Other Refs: 1,254,705

Mar, 1965	DT

Primary Examiner: Olms, Doulgas W.
Assistant Examiner:
Attorney: Flocks; Karl W.