公开(公告)号：US3576949A

公开(公告)日：1971-05-04

申请号：US3576949D

申请日：1968-01-18

Applicant: INT STANDARD ELECTRIC CORP

Inventor： DEWIT FRANS CORNEEL LEO ,  ADELAAR HANS HELMUT

IPC: H04Q3/00 ,  H04Q3/48

CPC classification number: H04Q3/0012

Abstract: A multistage relay crosspoint network is disclosed in which a connection is held operated through the windings of the relays, each in series with its make contact. In a four-stage connection the hold contacts of the 1st and 2nd as well as those of the 3rd and 4th stages are serially connected and such hold connections replace similar parallel ones involving marking contacts. The invention substantially reduces the number of marking relays needed to establish connections by having the windings of the 1st and 2nd as well as those of the 3rd and 4th stages on the same side and by selecting, through access relay contacts, the desired crosspoints in the 1st and 3rd stages while marking rectifiers are used in the 2nd and 4th to enable bundles of marking wires to be selected in these stages in order to operate the desired crosspoints in these stages also.

公开(公告)号：US3903375A

公开(公告)日：1975-09-02

申请号：US43751774

申请日：1974-01-28

Applicant: INT STANDARD ELECTRIC CORP

Inventor： DEWIT FRANS CORNEEL LEO

IPC: H04M19/02 ,  H04M3/02

CPC classification number: H04M19/026

Abstract: A DC/AC discriminating circuit is disclosed for a ring-trip device. A service connected reactor and light emitting diode which forms part of an electro-optical device is branched in parallel across a resistor forming part of the line loop. When the called subscriber goes off-hook, a light emitting diode reacts due to DC current flowing in the above series connection and conditions the state of a ring trip relay via a photo transistor coupled to this relay.

Abstract translation: 公开了一种用于环形跳闸装置的DC / AC鉴别电路。 形成电光装置的一部分的服务连接的电抗器和发光二极管在形成线环路的一部分的电阻上并联分支。 当被叫用户摘机时，发光二极管由于在上述串联连接中流过的直流电流而发生反应，并通过耦合到该继电器的光电晶体来调节环形跳闸继电器的状态。