Telephone private branch exchange system
AssigneeCompagnie Industrielle des Telecommunications Cit-Alcatel
InventorsPierre Morgand, Yves Riou
Life of this patent
Estimating the term…
Abstract
Telephone automatic switching unit for semi-public use, serving private subscribers and permitting communication by at least a portion of the subscribers via the public communication network by either direct connection of the network, or by means of operators, the subscribers being associated with either one or several different enterprises. The automatic switching unit includes a connecting network, a central control member or a processing unit, registers, senders, and incoming and outgoing circuits for providing communication between subscribers as well as connection with the public network.
Claims7
In a private branch exchange providing a multi-stage connecting network between private subscribers and for providing connection of at least a portion of the private subscribers with a public communication system including a central office by direct connection with the central office or connection thereto by means of operators, the private subscribers being associated with one or several enterprises located in the same general area, the automatic switching unit including processing means for determining the connection path to be provided through said connecting network means and register-sender means, the improvement comprising incoming and outgoing trunk means for connecting a subscriber with said central office, the incoming and outgoing trunk means being connected with a switching stage of the connecting network via two different paths, one of the paths providing a path for utilization by a first subscriber requesting communication with said central office, the other path providing a path for utilization by a second subscriber on a call back by the first subscriber, the incoming and outgoing trunk means further being connected with said register-sender means via a first line selector means connecting the incoming and outgoing trunk means to a first register means for registering the call back number of the second subscriber to assure the connection of the station of the first subscriber to the station of the second subscriber.
In a private branch exchange providing a multi-stage connecting network between private subscribers and between at least a portion of the private subscribers and a central exchange, the connecting network including at least first and second connecting network stages, the private subscribers being connected with a first connecting network stage, processing means for controlling the connecting network path to be provided for a desired communication, register-sender means for signalling of dial tones and for registering and signalling a called number, said register-sender means including first and second register means and first sender means, the improvement comprising incoming and outgoing trunk means for providing a connection path between the private subscribers and the subscribers of the public communication system, the incoming and outgoing trunk means being connected with a second connecting network stage of the connecting network via two different linkage paths, one of the linkage paths providing a path for utilization by a first private subscriber requesting or receiving connection with central office, the other linkage path providing a path for utilization by a second subscriber for call back by the first subscriber, the incoming and outgoing trunk means further being connected with said register-sender means, a first line selector means connecting the incoming and outgoing trunk means to the first register means for registering the call back number of the second subscriber and to the first sender means, the outgoing trunk means being connected with the first sender means, the first sender means including decimal sender means for signalling and emitting the number of the party called by a private subscriber on an outgoing line to the public communication system, the first register means being connected via the first line selector means with the incoming terminal circuit means for receiving from the central office the number of the private subscriber being called and providing an output indicative thereof to said proceeding means, the processing means determining and ordering a connecting path through the connecting network in response thereto.
Dependencies are inferred from the claim text.