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    Telephone switching system
    3.
    发明授权
    Telephone switching system 失效
    电话切换系统

    公开(公告)号：US3882286A

    公开(公告)日：1975-05-06

    申请号：US35846573

    申请日：1973-05-08

    Applicant: AMTRON

    Inventor： PORTER VIRGLE E

    IPC: H04Q3/62 ,  H04Q1/52

    CPC classification number: H04Q3/625

    Abstract: There is disclosed an improved telephone switching system which in the preferred embodiment comprises a private branch exchange (PBX). The improved telephone switching system includes a crosspoint matrix of horizontal and vertical terminal dimensions N X M, respectively, with the matrix crosspoint at the intersection of respective horizontal and vertical terminal pairs being adapted for effecting an electrical interconnection of said respective terminal pairs in response to coincident signal markings thereon and further having N termination circuits and M normally idle link circuits coupled to individual ones of said horizontal and vertical terminals, respectively, of said matrix. A plurality of Z registers are associated with the link circuits. Several automatic features are provided by the telephone switching system through the use of common circuitry associated with the registers. Heretofore, these automatic features required individual circuits to be associated with each termination and in certain instances, these automatic features have heretofore not been provided.

    Abstract translation: 公开了一种改进的电话交换系统，其在优选实施例中包括专用小交换机（PBX）。 改进的电话交换系统分别包括水平和垂直终端尺寸N×M的交叉点矩阵，其中在相应的水平和垂直终端对的相交处的矩阵交叉点适于响应于所述各个终端对的电互连 并且其上还具有分别与所述矩阵的所述水平和垂直端子中的各个端子耦合的N个终端电路和M个常空闲链路电路。 多个Z寄存器与链路电路相关联。 电话交换系统通过使用与寄存器相关联的公共电路来提供若干自动特征。 迄今为止，这些自动特征要求各个电路与每个终端相关联，并且在某些情况下，这些自动特征迄今未被提供。

    Counting circuit
    5.
    发明授权
    Counting circuit 失效
    计数电路

    公开(公告)号：US3559077A

    公开(公告)日：1971-01-26

    申请号：US3559077D

    申请日：1967-08-21

    Applicant: AMTRON

    Inventor： PORTER VIRGLE E

    IPC: H03K3/013 ,  H03K21/02 ,  H03K21/00

    CPC classification number: H03K21/02 ,  H03K3/013

    Abstract: AN ELECTRONIC CONTROL CIRCUIT HIGHLY INSENSITIVE TO NOISE INCLUDING CONTACT BOUNCE, HAVING AN INPUT CIRCUIT INCLUDING A SATURABLE MAGNETIC CORE REACTOR WITH A SINGLE COIL THROUGH WHICH THE INPUT SIGNAL IS APPLIED. THE INPUT CIRCUIT IS NONRESPONSIVE TO INPUT SIGNALS OF A TIME DURATION LESS THAN A TIME DURACTION-PRESELECTED BY THE PLURALITY OF TAPS

    ON THE COIL. CONNECTED TO THE INPUT CIRCUIT ARE BISTABLE MULTIVIBRATOR CIRCUITS WITH AN INTERNAL CAPACITIVE FEEDBACK COUPLING RENDERING EACH MULTIVIBRATOR CIRCUIT NONRESPONSIVE TO TRIGGERING BY ELECTRICAL SIGNALS OF A FREQUENCY SUBSTANTIALLY HIGHER THAN ITS OPERATING FREQUENCY.

    Telephone switchboard with universal line/trunk circuits
    6.
    发明授权
    Telephone switchboard with universal line/trunk circuits 失效
    带通用线路/电话电路的电话开关

    公开(公告)号：US3557317A

    公开(公告)日：1971-01-19

    申请号：US3557317D

    申请日：1968-06-10

    Applicant: AMTRON

    Inventor： PORTER VIRGLE E

    IPC: H04M3/60 ,  H04Q3/00 ,  H04M3/42

    CPC classification number: H04M3/60 ,  H04Q3/0012

    Abstract: A telephone switchboard includes N line/trunk circuits and M links individually coupled to the N horizontal and M vertical terminals, respectively, of a crosspoint matrix. An incoming call is connected to an allotted one of the links and thence to a called party by control circuitry that effects closure of two crosspoints on a single vertical terminal of the matrix. An operator automatic answer circuit queues incoming calls in the order of their occurrence and permits the operator to individually access and service these calls with a minimum of effort. Signaling and indicator circuits utilize positive and negative control signal biases on the connecting matrix talk path to provide various operator informational or control functions. Selected line/trunk circuits are provided a higher grade of service, i.e., a lesser probability of encountering a busy signal by apparatus which reserves certain of the links for use only by priority status line/trunks. Numerous other features, such as special conference link circuitry, are disclosed.

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