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    Key telephone station having multinetwork access
    1.
    发明授权
    Key telephone station having multinetwork access 失效
    具有多媒体访问权限的主要电话站

    公开(公告)号：US3621146A

    公开(公告)日：1971-11-16

    申请号：US3621146D

    申请日：1969-07-10

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： MORSE CHARLES E ,  SMITH JOHN P

    IPC: H04M9/00 ,  H04M3/38

    CPC classification number: H04M9/005

    Abstract: A key telephone system is arranged to provide access to both secure and nonsecure lines while, at the same time, maintaining the degree of isolation between the lines required of secure communication facilities. Each key station is selectively connected to the nonsecure lines through one switching network while connections to secure lines are made through a separate switching network. A station control circuit associated with each key station provides access for that station to either one of the switching networks. The operation of a line key at any station enables the switching network serving that line so as to cause the establishment of a transmission path from the enabling station through the control circuit to the enabled network.

    Shared usage of key telephone system line circuits
    3.
    发明授权
    Shared usage of key telephone system line circuits 失效
    共享电话系统线电路的使用

    公开(公告)号：US3591725A

    公开(公告)日：1971-07-06

    申请号：US3591725D

    申请日：1969-07-11

    Applicant: BELL TELEPHONE LABOR INC

    Inventor： MORSE CHARLES E ,  SMITH JOHN P ,  TRUBY RALPH

    IPC: H04M9/00 ,  H04Q3/00 ,  H04M3/42

    CPC classification number: H04Q3/0012 ,  H04M9/005

    Abstract: A key telephone system is arranged to provide access for any number of key telephone stations to any number of line circuits. When two or more stations are selectively connected to the same line circuit, the transmission capability of each such station is placed under control of a push-to-talk key at that station. The line circuit is associated with a selector for scanning each such connected station sequentially and for providing exclusive transmission capability to a first detected station having an operated push-to-talk key. On simultaneous connections to certain line circuits, the enabling of an override key at any of the connected stations provides unlimited transmission capability from that station without regard to the operational status of the push-to-talk key.

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