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    Two-way signaling circuit employing a common oscillator having a feedback transformer toy providing dc isolation between signal sources
    5.
    发明授权
    Two-way signaling circuit employing a common oscillator having a feedback transformer toy providing dc isolation between signal sources 失效
    采用通用振荡器的双向信号电路，具有提供信号源之间的直流隔离的反馈变压器玩具

    公开(公告)号：US3618128A

    公开(公告)日：1971-11-02

    申请号：US3618128D

    申请日：1969-05-19

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： HOUCKE GEORGE P

    IPC: H04L12/02 ,  H04Q1/44 ,  H03B5/00

    CPC classification number: H04Q1/44 ,  H04L12/02 ,  H04L25/0268

    Abstract: Two-way signaling between a line loop and local terminals is accomplished by directly applying the line loop signals to an oscillator to alternatively turn on and turn off the oscillator and by applying the local terminal signals across the secondary winding of a transformer whose primary winding is in the oscillator feedback circuit to modify the reflected impedance across the primary winding and thus alternatively turn on and turn off the oscillator. The loop signals are recovered by a circuit coupled to the secondary winding and the local signals are applied to the loop by a circuit coupled to the primary winding to provide duplex signaling and, by virtue of the transformer, direct current isolation.

    Line scanner circuit for data concentrator
    7.
    发明授权
    Line scanner circuit for data concentrator 失效
    数据采集​​器线扫描电路

    公开(公告)号：US3627953A

    公开(公告)日：1971-12-14

    申请号：US3627953D

    申请日：1969-05-19

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： HOUCKE GEORGE P

    IPC: H04Q3/54

    CPC classification number: H04Q3/54

    Abstract: Bidding data station lines and idle trunks are interconnected by way of a switch matrix. Line and trunk scanners are provided to hunt for bidding lines and available trunk, respectively. When a trunk scanner locates an available trunk, it locks on the trunk and stops hunting. The line scanner is arranged to hunt for a bidding line without regard to the availability of a trunk. When no trunk is available, the line scanner locks on the first bidding line it locates to provide pseudoqueuing by serving the bidding line first when a trunk becomes free.

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