Private automatic branch exchange with central office features

Claim 2

A private automatic branch exchange for servicing a large number of subscriber stations comprising a plurality of subscriber line circuits, a plurality of local registers capable of storing and analyzing digit signals, a line link network providing a concentrator for originating connections and a fan-out for terminating connections, a service link network, a plurality of junctors, common control means for connecting a line circuit via said line link network, a junctor and said service link network to a selected local register, a plurality of ringing controls connected to said line link network for selective connection to a line circuit, a plurality of trunk circuits, a trunk link network responsive to said common control means for connecting said junctors to said ringing controls or to said trunk circuits, a plurality of operator position circuits, an operator console connected to each operator position circuit, and an operator service link network responsive to said common control means for selectively connecting said operator position circuits to said trunk circuits.

Claim 3

A private automatic branch exchange defined in claim 1, wherein said common control means includes a translator connected to said local registers and storage means connected to said translator and said trunk circuits for storing trunk identification data and class-of-service data relating to selected line circuits for the duration of a call involving said circuits.

Claim 4

A private automatic branch exchange as defined in claim 2, further including a plurality of loop circuits associated in groups with each operator position circuit for connecting said position circuit through said operator service link network to a selected trunk circuit.

Claim 5

A private automatic branch exchange as defined in claim 3, further including a plurality of dial pulse acceptors connected to said operator service link network for connection to one of said trunk circuits and a plurality of incoming registers each connected directly to a selected one of said dial pulse acceptors and to said translator for storing and analyzing digit signals received from outside the exchange.

Claim 6

A private automatic branch exchange as defined in claim 3, further including a plurality of transfer line circuits connected to the input of said line link network and a plurality of transfer circuits connected on the operator side of said operator service link network for effecting connection of a selected trunk circuit to one of said transfer line circuits so as to pass digit signals from said trunk circuit via said operator service link network through said transfer line circuit, said line link network, a junctor, and said service link network to a local register circuit and to thereby establish a transfer communication path.

Claim 7

A private automatic branch exchange as defined in claim 5, further including a transfer common circuit connected to all of said transfer circuits and having a direct connection to the input of said service link network for initiating a direct connection between a trunk circuit connected to a transfer circuit and a given local line circuit through said trunk link network and said line link network.

Claim 8

A private automatic branch exchange as defined in claim 5, further including transfer common means having a direct connection between said transfer circuits and the input of said service link network for establishing an additional communication path in parallel with said transfer communication path directly from said trunk circuit through said trunk link network and said line link network.

Claim 9

A private automatic branch exchange as defined in claim 1, further including a plurality of loop circuits associated in groups with each operator position circuit for connecting said position circuit through said operator service link network to a selected trunk circuit.

Claim 10

A private automatic branch exchange as defined in claim 1, further including a plurality of transfer line circuits connected to the input of said line link network and a plurality of transfer circuits connected on the operator side of said operator seRvice link network for effecting connection of a selected trunk circuit to one of said transfer line circuits so as to pass digit signals from said trunk circuit via said operator service link network through said transfer line circuit, said line link network, a junctor, and said service link network to a local register circuit and to thereby establish a transfer communication path.

Claim 11

A private automatic branch exchange as defined in claim 9, further including a transfer common circuit connected to all of said transfer circuits and having a direct connection to the input of said service link network for initiating a direct connection between a trunk circuit connected to a transfer circuit and a given local line circuit through said trunk link network and said line link network.

Claim 12

A private automatic branch exchange as defined in claim 9, further including transfer common means having a direct connection between said transfer circuits and the input of said service link network for establishing an additional communication path in parallel with said transfer communication path directly from said trunk circuit through said trunk link network and said line link network.

Claim 13

A private automatic branch exchange for servicing a large number of subscriber stations comprising a plurality of subscriber line circuits, a plurality of local registers capable of storing and analyzing digit signals, a line link network, a service link network, a plurality of junctors, a line marker and scanner circuit for scanning said line circuits for request for service, a junctor control responsive to said line marker and scanner circuit for effecting connection of a line circuit through said line link network to an available junctor, a service link network control responsive to said line marker and scanner circuit for effecting connection of a junctor through said service link network to an available local register, a trunk link network, a plurality of trunk circuits, a trunk link network control responsive to said junctor control for connecting a junctor through said trunk link network and said line link network to a subscriber line circuit or through said trunk link network to a trunk circuit, a plurality of operator position circuits, an operator console connected to each operator position circuit, and common control means for connecting said operator position circuits to said trunk circuits through said operator service link network.

Claim 14

A private automatic branch exchange for servicing a large number of subscriber stations comprising a plurality of subscriber line circuits, a plurality of local registers capable of storing and analyzing digit signals, a line link network, a service link network, a plurality of junctors, a line marker and scanner circuit for scanning said line circuits for request for service, a junctor control responsive to said line marker and scanner circuit for effecting connection of a line circuit through said line link network to an available junctor, a service link network control responsive to said line marker and scanner circuit for effecting connection of a junctor through said service link network to an available local register, a trunk link network, a plurality of trunk circuits, a trunk link network control responsive to said junctor control for connecting a junctor through said trunk link network and said line link network to a subscriber line circuit or through said trunk link network to a trunk circuit, a plurality of operator position circuits, an operator console connected to each operator position circuit, and common control means for connecting said operator position circuits to said trunk circuits through said operator service link network.

Claim 15

A private automatic branch exchange as defined in claim 12 wherein said trunk circuits include a plurality of incoming/outgoing trunks for connecting subscriber line circuits to the outside world, a plurality of attendant trunks of connecting a subscriber line circuit to an operator position circuit and a plurality of access trunks for connecting an operator position circuit to a subscriber line circuit.

Claim 16

A private automatic branch exchange as defined in claim 13, further including an outgoing trunk marker for marking selected incoming/outgoing and attendant trunks, and a translator connected to said local registers for translating said analyzed digit signals and actuating said line marker and scanner circuit and said outgoing trunk marker for marking operations.

Claim 17

A private automatic branch exchange as defined in claim 14, further including a plurality of loop circuits associated in groups with each operator position circuit and individually connecting said position circuit to said operator service link network.

Claim 18

A private automatic branch exchange as defined in claim 14, including storage means connected to said translator and said trunk circuits for storing trunk identification data and class-of-service data relating to selected line circuits for the duration of a call involving said circuits.

Claim 19

A private automatic branch exchange as defined in claim 16, further including a plurality of dial pulse acceptors connected to said operator service link network for connection to one of said trunk circuits and a plurality of incominG registers each connected directly to a selected one of said dial pulse acceptors and to said translator for storing and analyzing digit signals received from outside the exchange.

Claim 20

A private automatic branch exchange as defined in claim 16, further including a plurality of transfer line circuits connected to said line link network and a plurality of transfer circuits connected on the operator side of said operator service link network for connecting an incoming/outgoing trunk through said operator service link network to a transfer line circuit so as to permit a subscriber line circuit connected to said incoming/outgoing trunk to apply digit signals via said transfer line circuit, said line link network, a junctor and said service link network to a local register in order to initiate the establishment of a transfer communication path through said transfer line circuit, said line link network, a junctor and said trunk link network to a second subscriber line circuit.

Claim 21

A private automatic branch exchange as defined in claim 18, further including transfer common means having a direct connection between said transfer circuits and the input of said service link network for establishing an additional communication path in parallel with said transfer communication path directly from said incoming/outgoing trunk circuit through said trunk link network and said line link network.

Claim 22

A private automatic branch exchange as defined in claim 19, wherein said transfer common means includes means responsive to establishment of said additional communication path for releasing said transfer communication path.

Claim 23

A private automatic branch exchange as defined in claim 18, wherein said incoming/outgoing trunks each include flash detection means for detecting an impulse of particular time duration and means responsive to class-of-service data from said storage means for signaling said common control means for connection to a transfer circuit where transfer is permitted by said data and for connection to an operator position circuit where transfer is not permitted by said data.

Claim 24

A private automatic branch exchange as defined in claim 21, further including a plurality of loop circuits associated in groups with each operator position circuit and connecting said position circuit to said operator service link network.

Claim 25

In combination with a central office including a line link network, a service link network, a trunk link network, a plurality of registers, a plurality of junctors, a plurality of subscriber line circuits and a plurality of trunk circuits, and common control means for interconnecting said plurality of subscriber line circuits through a junctor and said service link network to a selected register, to one another through said line link network and a junctor and to a trunk circuit through said line link network, a junctor and said trunk link network, an operator control arrangement comprising an operator service link network, a plurality of operator position circuits, an operator console connected to each operator position circuit and additional common control means for selectively connecting said operator position circuits through said operator service link network to a selected trunk circuit.

Claim 26

In combination with a central office including a line link network, a service link network, a trunk link network, a plurality of registers, a plurality of junctors, a plurality of subscriber line circuits and a plurality of trunk circuits, and common control means for interconnecting said plurality of subscriber line circuits through a junctor and said service link network to a selected register, to one another through said line link network and a junctor and to a trunk circuit through said line link network, a junctor and said trunk link network, an operator control arrangement comprising an operator service link network, a plurality of operator position circuits, an operator console connected to each operator position circuit and additional common control means for selectively connecting said operator position circuits through said operator service link network to a selected trunk circuit.

Claim 27

A private automatic branch exchange as defined in claim 23, further including a plurality of loop circuits associated in groups with each operator position circuit and connecting said position circuit to said operator service link network.

Claim 28

A private automatic branch exchange as defined in claim 24 wherein said trunk circuits include a plurality of incoming/outgoing trunks for connecting subscriber line circuits to the outside world, a plurality of attendant trunks for connecting a subscriber line circuit to an operator position circuit and a plurality of access trunks for connecting an operator position circuit to a subscriber line circuit.