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    Control of operation of a system
    81.
    发明授权
    Control of operation of a system 失效
    系统运行控制

    公开(公告)号：US3745418A

    公开(公告)日：1973-07-10

    申请号：US3745418D

    申请日：1971-07-28

    Applicant: COMMW OF AUSTRALIA

    Inventor： MCLEOD N

    IPC: H04M3/12 ,  H04M3/24 ,  H04M3/32 ,  H04Q3/00 ,  H04Q3/545 ,  H02H5/04

    CPC classification number: H04M3/24 ,  H04M3/12 ,  H04M3/323 ,  H04Q3/00 ,  H04Q3/545

    Abstract: A system comprising a plurality of signal paths each of which has an operative condition in which it can carry a signal and an inoperative condition in which it cannot, and a control which is normally capable of placing each or any of said paths in the inoperative condition, there being a fuse in each path and the control being above to ensure that a current sufficient to blow the fuse will flow on any path which is in its operative condition when it ought to be in the inoperative condition.

    Artificial line busy circuit
    82.
    发明授权
    Artificial line busy circuit 失效
    人造线路繁忙电路

    公开(公告)号：US3673339A

    公开(公告)日：1972-06-27

    申请号：US3673339D

    申请日：1970-07-22

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： KORN FRANKLIN ADAM

    IPC: H04M1/663 ,  H04M3/12 ,  H04M3/436 ,  H04M1/00

    CPC classification number: H04M1/663 ,  H04M3/12 ,  H04M3/436 ,  H04M2201/14

    Abstract: Auxiliary line circuitry is disclosed for making a customer telephone line appear busy for timed periods and only in response to incoming calls. The circuitry is activated by incoming call ringing for connecting a bridge network to the customer line for applying a busy tone thereto, immediately tripping ringing and retaining a timed off-hook signal on the line following a calling party disconnect. Thereafter, the bridge network causes a permanent signal to be automatically originated for making the customer phone appear busy for a period controlled by timers in the auxiliary line circuitry.

    Abstract translation: 公开了辅助线路电路，用于使客户电话线在定时周期内出现繁忙并且仅响应于来电。 电话通过呼入呼叫激活，用于将桥接网络连接到客户线路以应用忙音，立即跳出振铃并在主叫方断开连接之后保持线路上的定时摘机信号。 此后，桥接网络导致自动发起永久信号，使得客户电话在辅助线路电路中由定时器控制的时段出现忙。

    Information presentation circuit
    83.
    发明授权
    Information presentation circuit 失效
    信息介绍电路

    公开(公告)号：US3559172A

    公开(公告)日：1971-01-26

    申请号：US3559172D

    申请日：1967-10-02

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： COLLINS JOHN J

    IPC: H04L12/08 ,  H04M3/12 ,  H04Q3/47

    CPC classification number: H04M3/12 ,  H04L12/08

    Abstract: A CIRCUIT FOR PROVIDING TIMING INFORMATION IS ARRANGED WITH A PAIR OF RELAY TRANSLATION NETWORKS, EACH OF WHICH IS SEQUENTIALLY ENABLED TO PROVIDE A CURRENT TIME INDICATION CORRESPONDING TO A COUNTED NUMBER OF SIGNALS. DELAY IN UPDATING THE CURRENT TIMING INFORMATION IS NEGATED BY OPERATING THE RELAYS OF ONE TRANSLATION NETWORK IN RE-

    SPONSE TO RECEIPT OF EACH SIGNAL IN PREPARATION FOR THE PRESENTATION OF THE NEXT TIME INDICATION WHILE CONCURRENTLY PROVIDING THE CURRENT TIME INDICATION THROUGH THE PREVIOUSLY OPERATED RELAY CONTACTS OF THE OTHER TRANSLATION NETWORK.

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