Endgerät für Telekommunikation und Informationsverarbeitung

Terminal equipment for telecommunications and information processing

Equipement terminal pour télécommunication et pour traitement d'information

Abstract

Terminal equipment (10) for telecommunications and information processing with improved electromagnetic compatibility (EMC). The equipment has a human-machine interface (HMI), connected via HMI cables 31 and 32, a metallic telecommunications interface (TCI), connected via TCI cable 41, and optionally a power line interface (PLI), connected via PLI cord 42. First common-mode rejection filters (Lc11, C11, C13; Lc12, C12, C14) comprising common-mode choke coils (Lc) and shunt capacitors (C) are placed at the HMI interface of the equipment, while second common-mode rejection filters (Lc21, C21, C23; Lc22, C22, C24) comprising the same components are placed at the TCI and PLI interfacces. High-frequency junction points (P1-P4) of the fisrt and second common-mode rejection filters are interconnected with a bypass circuit (BG). Being isolated from the signal ground (SG) and frame ground (FG) of the equipment, the bypass circuit (BG) is an independent non-grounded circuit. Such internal structure makes it possible to reject noise signals induced by an external noise source and also to suppress spurious radiation from an internal noise source.

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Cited By (6)

    Publication numberPublication dateAssigneeTitle
    EP-1143762-A1October 10, 2001AlcatelDispositif et méthode de filtrage de signaux
    EP-1143763-A1October 10, 2001Alcatel Alsthom Compagnie Generale D'electriciteDispositif de terminaison de réseau et méthode de filtrage de signaux
    EP-1795024-A1June 13, 2007Research In Motion LimitedMobiles drahtloses kommunikationsgerät mit verringerten störungen von der tastatur in den funkempfänger
    EP-1795024-A4October 31, 2007Research In Motion LtdMobile wireless communications device with reduced interference from the keyboard into the radio receiver
    US-6931721-B2August 23, 2005Silitek CorporationMethod for improving EMC of keyboard soft board
    US-7363063-B2April 22, 2008Research In Motion LimitedMobile wireless communications device with reduced interference from the keyboard into the radio receiver