Local transfer arrangement for electronic private automatic branch exchange

• US 3,963,873 A
• Filed: 03/25/1975
• Issued: 06/15/1976
• Est. Priority Date: 03/25/1975
• Status: Expired due to Term

• Current Assignee: Congress Financial Corporation (Wells Fargo & Company)
• Original Assignee: Stromberg-Carlson Corp.
• Inventors: Richards, Glenn L., Pommerening, Uwe A.
• Primary Examiner(s): Robinson, Thomas A.
• Application Number:
  US05/561,745
• Time in Patent Office: 448 Days
• Field of Search: 179/18 AD, 179/18 EA, 179/18 GF, 179/18 ES, 179/18 AB, 179/18 FF, 179/18 AH, 179/18 AG, 179/18 BD, 179/18 BE, 179/18 C, 179/27 CA, 179/99
• US Class Current: 379/212.01
• CPC Class Codes: H04Q 3/521 using semiconductors in the switching stages

Abstract

A local transfer arrangement for an electronic private automatic branch exchange having a space divided rectangular solidstate switching matrix is disclosed. The local transfer arrangement is provided with means for sensing a local transfer indication from either a calling station or a called station connected by a local junctor. The transfer indication causes the system to forward the transferring station to a second local junctor and hold the first local junctor. A transferee station is then signaled via the second local junctor of the impending local transfer by the transferring station. Thereafter, an automatic forwarding of the transferee station to the first local junctor is initiated by an on-hook condition of the transferring station to complete the operation. Additional features of the arrangement provide for a return to the original call and release of the connected junctors responsive to an on-hook or hookflash condition of the transferring station. A local three-way conference feature is also provided to establish a connection between the transferred station, transferee station, and transferring stations of the exchange.

Claims

1. In a private automatic branch exchange having a solid state switching matrix for connecting calling local stations to called local stations therethrough and including a common control for effecting said connections by a plurality of local junctors having a memory associated with said local junctors, a local transfer arrangement comprising:

holding circuit means, responsive to a local transfer indication from a transferring station connected to a transferred station by a first local junctor, for placing the transferred station in a holding status;

forwarding circuit means, responsive to said local transfer indication, for forwarding said transferring station to a second local junctor while said transferred station is in said holding status;

signaling circuit means, directed by said transferring station while connected to said second local junctor, for signaling a transferee station of an impending local transfer; and

connecting circuit means, responsive to receipt of an impending local transfer signal by said transferee station, for effecting a connection between said transferred station and said transferee station.

2. A local transfer arrangement as defined in claim 1 wherein said signaling circuit means includes means for connecting said transferring station to said transferee station by the second local junctor.

3. A local transfer arrangement as defined in claim 2 wherein said connecting circuit means includes means for effecting a three-way conference between said transferring station, said transferred station, and said transferee station.

4. A local transfer arrangement as defined in claim 3 wherein said signaling circuit means includes means, responsive to a first signal from said transferring station, for re-establishing the original local call.

5. A local transfer arrangement as defined in claim 4 wherein said signaling circuit means includes means, responsive to a second signal from said transferring station, for releasing said first and said second local junctors.

6. A private automatic branch exchange having a solid state switching matrix with line appearances on one co-ordinate side of the matrix and junctor appearances on the other co-ordinate side of the matrix wherein the connection of line appearances for local calls occurs by the closing of an associated crosspoint for each line appearance and for a local junctor, said exchange including a common control, time accessed by each junctor for effecting said connection by a progression of functional status indications wherein each junctor has a corresponding memory including storage for said status indications and the identities of the line appearances for the calling and called parties connected therethrough;

said exchange being characterized by a local transfer circuit comprising;

holding circuit means, responsive to a local transfer indication from a transferring station connected to a transferred station by one of said local junctors, for effecting the progression of the local junctor status from a local call in progress status to a local transfer holding status;

forwarding circuit means, responsive to said local transfer indication, for forwarding said transferring station to a second local junctor while said first junctor is in said local transfer holding status;

signaling circuit means, directed by said transferring station while connected to said second local junctor, for signaling a transferee station of an impending local transfer; and

connecting circuit means, responsive to an answering signal received from said transferee station, for effecting a connection between said transferred station and said transferee station.