Universal night service circuit

• US 3,867,581 A
• Filed: 12/29/1972
• Issued: 02/18/1975
• Est. Priority Date: 12/29/1972
• Status: Expired due to Term

• Current Assignee: Congress Financial Corporation (Wells Fargo & Company)
• Original Assignee: Uwe A. Pommerening
• Inventors: Pommerening, Uwe A.
• Primary Examiner(s): Claffy, Kathleen H.
• Assistant Examiner(s): Bartz, C. T.
• Application Number:
  US05/319,449
• Time in Patent Office: 781 Days
• Field of Search: 179/18BD,18BE,27CB
• US Class Current: 379/265.01
• CPC Class Codes: H04M 3/546 in private branch exchanges

Abstract

A universal night service circuit which includes a rerouting function so that, subsequent to establishment of a connection to a subscriber station from an outside line through the night service circuit, the system automatically functions to establish a parallel path directly through the link networks to the subscriber station bypassing the night service circuit, thereby making the night service circuit immediately available for another night service call.

Claims

1. In a private automatic branch exchange including central office equipment provided with a plurality of line circuits, said central office equipment being interconnected with private branch equipment provided with a plurality of trunk circuits, an operator complex and transfer means for effecting transfer of an incoming communication connection of a trunk circuit from a first line circuit to a second line circuit in said central office equipment, a universal night service circuit comprising signal means actuating a signaling indicator, a dummy load, control mEans responsive to an incoming communication connection at one of said trunk circuits for connecting said dummy load to said trunk circuit including signal control means for actuating said signal means upon connection to said trunk circuit, a calling bridge relay arrangement, means in said central office equipment responsive to detection of a special dialed digit signal generated from a selected line circuit for connecting said calling bridge relay arrangement to said selected line circuit through said central office equipment, storage means for storing the identification of said selected line circuit and means responsive to connection of said calling bridge relay arrangement to said selected line circuit for actuating said transfer means to connect said trunk circuit to the line circuit whose identification is stored in said storage means through said central office equipment.

2. A universal night service circuit as defined in claim 1 wherein said private branch equipment includes trunk scanner means for scanning each of said trunk circuits and generating a request signal upon detection of an incoming communication connection to one of said trunk circuits and system timing means for generating timing signals for coordinating the operations of said equipment.

3. A universal night service circuit as defined in claim 2 wherein said control means includes first gating means responsive to receipt of a night service request signal from said trunk scanner means and a timing signal from said system timing means for generating a mark signal to initiate connection of said universal night service circuit to said one trunk circuit and detector means responsive to detection of connection of a closed loop connection to said trunk circuit for connecting said dummy load to said closed loop and actuating said signal control means.

4. A universal night service circuit as defined in claim 3 wherein said operator complex of said private branch equipment includes an operator service link network for selectively connecting said trunk circuits to selected operator position circuits, said universal night service circuit being connected by a pair of communication lines to said one trunk circuit through said operator service link network in response to generation of said mark signal by said first gating means.

5. A universal night service circuit as defined in claim 1 wherein said central office equipment includes a trunk link network for selectively interconnecting trunk circuits and line circuits and common control means for detecting requests for service from said line circuits and establishing a communication connection from said line circuits through said trunk link network in response thereto, said storage means receiving the identification of said selected line circuit from said common control means.

6. A universal night service circuit as defined in claim 5 wherein said means for connecting said calling bridge relay arrangement to said selected line circuit is actuated by a control signal from said common control means for extending a communication connection from said trunk link network to said relay arrangement when said common control detects said special dialed digit signal.

7. A universal night service circuit as defined in claim 6 wherein said control means includes means for extending a communication connection to said one trunk circuit upon detection of a listed directory number call in conjunction with a night service request, said communication connection extending to said trunk circuit being isolated from said communication connection to said calling bridge relay arrangement.

8. A universal night service circuit as defined in claim 7 including means responsive to said control signal from said common control for de-actuating said signal means.

9. In a private automatic branch exchange including a plurality of line circuits, a plurality of trunk circuits and a switching network for connecting a trunk circuit to one of said line circuits on an incoming call, a universal night service circuit responsive to listed directory calls comprising signal means actuating a signaling indicator, control means responsive to a listed directory call at one of said trunk circuits for actuating said signal means, a calling bridge relay arrangement, connection means responsive to detection of a special dialed digit signal generated from a selected line circuit for connecting said calling bridge relay arrangement to said selected line circuit through said switching network and de-actuating said signal means, storage means for storing the identification of said selected line circuit, transfer means responsive to said connection means for connecting said one trunk circuit directly to the line circuit identified by said storage means through said switching network, and means responsive to completion of said direct connection by said transfer means for releasing said calling bridge relay arrangement from connection to said selected line circuit.

10. A private automatic branch exchange as defined in claim 9 wherein said control means includes first gating means responsive to receipt of a service request signal from said one trunk circuit for extending a closed loop connection thereto and detector means responsive to detection of completion of said closed loop connection to said one trunk circuit for actuating said signal means.

11. A private automatic branch exchange as defined in claim 10, further including an operator service link network for selectively connecting said trunk circuits to selected operator position circuits, said universal night service circuit being connected to said one trunk circuit through said operator service link network in response to said first gating means.

12. A universal night service circuit as defined in claim 9 wherein said control means includes means for extending a communication connection to said one trunk circuit upon detection of a listed directory number call in conjunction with a night service request, said communication connection extending to said trunk circuit being isolated from said communication connection to said calling bridge relay arrangement.

13. A private automatic branch exchange as defined in claim 9 wherein said transfer means includes a direct connection to said switching network for initiating connection of said one trunk circuit to said selected line circuit on a communication connection which bypasses said night service circuit.

14. A private automatic branch exchange as defined in claim 13 wherein said switching network includes common control means for detecting requests for service from said line circuits and for establishing a communication connection from said line circuits to said trunk circuits in response thereto, said night service circuit including number storage means for storing the number of said selected line circuit derived from said common control means, said transfer means serving to actuate said common control means to connect said one trunk circuit to the line circuit whose number is stored in said number storage means.

15. In a private automatic branch exchange including central office equipment provided with a line link network, a service link network and a trunk link network for interconnecting a plurality of subscriber line circuits, said central office equipment being interconnected with private branch equipment provided with an operator service link network, a plurality of trunk circuits, a plurality of operator position circuits, and common control means for connecting said operator position circuits through said operator service link network to a selected trunk circuit, and transfer means for effecting transfer of an incoming communication connection from a first line circuit to a second line circuit through said trunk link network, a universal night service circuit comprising signal means actuating a signaling indicator, control means responsive to a listed directory number call at one of said trunk circuits for actuating said signal means, means reSponsive to detection of a special dialed digit signal generated from a selected line circuit for connecting a holding termination through said line link network to said selected line circuit, and means responsive to connection of said holding termination to said selected line circuit for actuating said transfer means to connect said trunk circuit to said selected line circuit directly through said trunk link network.

16. A universal night service circuit as defined in claim 15 wherein said private branch equipment includes trunk scanner means for scanning each of said trunk circuits and generating a request signal upon detection of an incoming communication connection to one of said trunk circuits and system timing means for generating timing signals for coordinating the operations of said equipment.

17. A universal night service circuit as defined in claim 16 wherein said control means includes first gating means responsive to receipt of a night service request signal from said trunk scanner means and a timing signal from said system timing means for generating a mark signal to initiate connection of said universal night service circuit to said one trunk circuit and detector means responsive to detection of connection of a closed loop connection to said trunk circuit for connecting said dummy load to said closed loop and actuating said signal control means.

18. A universal night service circuit as defined in claim 15 wherein said control means includes means for extending a closed loop connection to said one trunk circuit upon detection of a listed directory number call in conjunction with a night service request, said closed loop connection being isolated from said holding termination.

19. A universal night service circuit as defined in claim 15 wherein said transfer means includes a direct connection to said switching network for initiating connection of said one trunk circuit to said selected line circuit on a communication connection which bypasses said night service circuit.

20. A universal night service circuit as defined in claim 18 including means responsive to said transfer means completing connection of said trunk circuit to said selected line circuit for releasing said holding termination and said closed loop connection.

21. In a private automatic branch exchange including 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 for connecting a line circuit via said line link network and said service link network to a selected local register, a plurality of ringing controls, a plurality of trunk circuits, a trunk link network connecting said junctor circuits via said ringing controls to said line link network or to said trunk circuits, a plurality of operator position circuits, an operator service link network connecting said operator position circuits to said trunk circuits, 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, said transfer common means having a direct connection with the input of said service link network for establishing a communication path directly from a trunk circuit through said trunk link network and said line link network, a universal night service circuit comprising signal means actuating a signal indicator, control means responsive to receipt of a listed directory number call at one of said trunk circuits for actuating said signal means, and means responsive to receipt of a special dialed digit signal from a selected line circuit in one of said registers for de-actuating said signal means and actuating said transfer common means to connect said selected line circuit to said one trunk circuit.

22. A private automatic branch exchange as defined in claim 21 Wherein said transfer common means is directly connected to one input of said service link network for initiating connection of said one trunk circuit to said selected line circuit on a communication connection which bypasses said night service circuit.

23. A private automatic branch exchange as defined in claim 22 wherein said private branch equipment includes trunk scanner means for scanning each of said trunk circuits and generating a request signal upon detection of an incoming communication connection to one of said trunk circuits and system timing means for generating timing signals for coordinating the operations of said equipment.

24. A private automatic branch exchange as defined in claim 23 wherein said control means includes first gating means responsive to receipt of a night service request signal from said trunk scanner means and a timing signal from said system timing means for generating a mark signal to initiate connection of said universal night service circuit to said one trunk circuit and detector means responsive to detection of connection of a closed loop connection to said trunk circuit for connecting a dummy load to said closed loop and actuating said signal control means.

25. A private automatic branch exchange as defined in claim 24 wherein said universal night service circuit includes a first holding termination connected to said one trunk circuit by said control means in response to detection of a night service request from said trunk circuit and a second holding termination connected through said trunk link network to said selected line circuit upon detection of said special dialed digit signal.

26. A private automatic branch exchange as defined in claim 25 wherein said universal night service circuit includes means responsive to connection of said selected line circuit to said one trunk circuit for releasing said first and second holding terminations.