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1626 条记录 (耗时 0.019 秒)

    Dual-tracking phase-locked loop
    241.
    发明公开
    Dual-tracking phase-locked loop 失效
    Phasenregelschleife mit zweifachem跟踪。

    公开(公告)号：EP0328378A2

    公开(公告)日：1989-08-16

    申请号：EP89301235.1

    申请日：1989-02-09

    申请人： NORTHERN TELECOM LIMITED

    发明人： Devries, Paul Arthur

    IPC分类号： H03L7/08 ,  H03L7/14 ,  H04J3/06

    CPC分类号： H03L7/148 ,  H03L7/093 ,  H04L7/033

    摘要： A dual-tracking phase-locked loop circuit is provided for moving with minimum disruption from conventional PLL operation to processor-controlled tracking of another closely related clock. In addition to conventional PLL components the circuit comprises a processor-controlled up/down counter which may operate alternatively as a link in the loop or as providing the base-line frequency determining value at the time of transition from PLL to processor-controlled tracking operation, thereby ensuring none disruptive transition.

    摘要翻译： 提供了双跟踪锁相环电路，用于以最小的中断从常规PLL操作移动到处理器控制的跟踪另一个紧密相关的时钟。 除了传统的PLL组件之外，该电路还包括一个处理器控制的向上/向下计数器，它可以作为环路中的链路交替工作，或者在从PLL转换到处理器控制的跟踪操作时提供基线频率确定值 ，从而确保没有破坏性的过渡。

    Protection arrangements for communications lines
    242.
    发明公开
    Protection arrangements for communications lines 失效
    通信线路的保护装置

    公开(公告)号：EP0260839A3

    公开(公告)日：1989-08-09

    申请号：EP87307683.0

    申请日：1987-08-28

    申请人： NORTHERN TELECOM LIMITED

    发明人： Hung, Francis Yun-Tai

    IPC分类号： H02H9/04 ,  H04M3/18 ,  H04Q1/18

    CPC分类号： H02H9/041 ,  H04M3/18

    摘要： A protection arrangement for a two-wire line, such as a telephone sunscriber line, includes a transformer having two primary windings and a secondary winding. The primary windings are connected in series with the wires of the line with phases such that common mode (longitudinal) currents on the line induce a current in the secondary winding, whereas loop currents do not. The induced current in the secondary winding is amplified and used to trigger a protection device, such as a triac or SCR and diode bridge arrangement, to short circuit the line for the duration of any excessive current thereon.

    摘要翻译： 用于双线线路的保护装置，例如电话防晒线，包括具有两个初级绕组和次级绕组的变压器。 初级绕组与线路的导线串联连接，使得线路上的共模（纵向）电流在次级绕组中感应出电流，而环路电流不能。 次级绕组中的感应电流被放大并用于触发保护装置，例如三端双向可控硅开关或SCR和二极管电桥布置，以使线路在其上的任何过电流的持续时间短路。

    Security handset
    246.
    发明公开
    Security handset 失效
    Sicherheitshandapparat。

    公开(公告)号：EP0319721A2

    公开(公告)日：1989-06-14

    申请号：EP88118585.4

    申请日：1988-11-08

    申请人： NORTHERN TELECOM LIMITED

    发明人： McClain, Donald

    IPC分类号： H04M1/19 ,  H04M1/68

    CPC分类号： H04M1/68 ,  H04M1/19

    摘要： A security device for use with a telephone handset having a microphone transducer (12) and an ear transducer (11) is disclosed. It is adapted to prevent eavesdropping while the handset is in an on-hook position. The security device is comprised of switching means (PSS₁-PSS₁₂) disposed in the handset adapted to disable the transducers. The switching means is switched to a first state when the handset is placed within a first predetermined orientation corresponding to a secure mode and is switched to a second state when the hand­set is placed within a second predetermined orientation corresponding to an operative mode.

    摘要翻译： 公开了一种用于具有麦克风换能器（12）和耳转换器（11）的电话听筒的安全装置。 它适用于在手机处于挂机位置时防止窃听。 安全装置包括设置在手持机中的适于禁用换能器的切换装置（PSS1-PSS12）。 当手机被放置在对应于安全模式的第一预定方向之内时，切换装置切换到第一状态，并且当手机放置在对应于操作模式的第二预定方向之内时，切换装置切换到第二状态。

    Transmission equipment
    248.
    发明公开
    Transmission equipment 失效
    数据传输设备

    公开(公告)号：EP0231630A3

    公开(公告)日：1989-06-14

    申请号：EP86309852.1

    申请日：1986-12-17

    申请人： NORTHERN TELECOM LIMITED

    发明人： Waters, Derek Brian ,  Sexton, Michael James

    IPC分类号： H04Q11/04 ,  H04Q3/545

    CPC分类号： H04Q11/0407 ,  H04Q2213/13031 ,  H04Q2213/13292

    摘要： A data transmission equipment, known as a primary digital multiplex (PDMX) consists of a bus structure formed by parallel lines on a printed circuit board, with the circuit units (1,2,3,4,5) on printed circuit cards set at right angles to the bus structure. The circuit units include a control unit (1,2) also called a core facilities unit, which acts as an interface to one or more 2Mb/sec. trunks, and so-called tributary units (3,4,5) which give access to subscriber and other outlets. Various networks using one or more such PDMX equipment are described. The signalling and control arrangements for the equipment use a signalling processing unit (2) and a tone processor (6). The signalling processing unit monitors the bus for signals and line conditions and issues signals appropriately. The tone processor functions in a generally similar manner.

    Optical fiber
    249.
    发明公开
    Optical fiber 失效
    光纤

    公开(公告)号：EP0176263A3

    公开(公告)日：1989-06-07

    申请号：EP85306162.0

    申请日：1985-08-30

    申请人： NORTHERN TELECOM LIMITED

    发明人： Abe, Koichi

    IPC分类号： C03B37/012

    CPC分类号： C03B37/01446 ,  C03B37/01211 ,  C03B37/01473 ,  C03B2201/12 ,  C03C13/045 ,  Y10S65/16

    摘要： A tubular porous silica preform 12 is made by depositing particulate silica on a mandrel 10 from which the preform is subsequently removed. A second solid cylindrical porous silica preform 28 is made by depositing particulate silica on an end surface of a support body. The porous preforms 12, 28 are then dried and the tubular preform 12 is heated in a fluorine containing atmosphere to introduce a fluorine dopant into the silica. The rod preform 28 is then placed inside the tubular preform 12 and the two preforms are further dried in a chlorine atmosphere to remove residual moisture. The dual preforms are then heated in a zone sintering furnace to consolidate and collapse the porous material of the rod and tubular preforms into a transparent fused silica rod. The composite preform obtained is heated and dielectric optical waveguide drawn from it, the waveguide having a pure silica or doped silica core derived from the rod preform 28 and a fluorine doped silica cladding derived from the tubular preform 12.