SE9602265D0 - Telephone Switching Circuit - Google Patents

Telephone Switching Circuit

Info

Publication number
SE9602265D0
SE9602265D0 SE9602265A SE9602265A SE9602265D0 SE 9602265 D0 SE9602265 D0 SE 9602265D0 SE 9602265 A SE9602265 A SE 9602265A SE 9602265 A SE9602265 A SE 9602265A SE 9602265 D0 SE9602265 D0 SE 9602265D0
Authority
SE
Sweden
Prior art keywords
switching circuit
telephone
telephone switching
line
semiconductors
Prior art date
Application number
SE9602265A
Other languages
Swedish (sv)
Other versions
SE9602265L (en
SE505338C2 (en
Inventor
Ivar J Haanes
Original Assignee
Ivar J Haanes
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ivar J Haanes filed Critical Ivar J Haanes
Publication of SE9602265D0 publication Critical patent/SE9602265D0/en
Publication of SE9602265L publication Critical patent/SE9602265L/en
Publication of SE505338C2 publication Critical patent/SE505338C2/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/68—Circuit arrangements for preventing eavesdropping
    • H04M1/70—Lock-out or secrecy arrangements in party-line systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

The telephone switching circuit is for use with two or more terminals connected in parallel to a common subscriber line (AL1,AL2) in a telephone system. The terminals (1,2) have restricted access to the telephone system in that only one at a time can have telephone connection within the system. - The telephone switching circuit (11) has two anti-parallel connected semiconductor elements (3,5) of thyristor character for each terminal, inserted in one line branch (11A) between the terminal and the line. The output electrodes (3A,5A) of the semiconductors lie in series in the line branch (11A). Gate electrodes (3C,5C) of the semiconductors are connected to each other through a resistor (4). Pref., an additional resistor (6,7) is connected between the input electrodes (3B,5B) and the gate electrode of each semiconductor element.
SE9602265A 1993-12-27 1996-06-07 Telephone switching circuit controlling connection between telephone sets - having two anti parallel thyristor type semiconductors for each set with gate electrodes connected via resistor SE505338C2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/NO1993/000198 WO1995018502A1 (en) 1993-12-27 1993-12-27 Telephone switching circuit

Publications (3)

Publication Number Publication Date
SE9602265D0 true SE9602265D0 (en) 1996-06-07
SE9602265L SE9602265L (en) 1996-06-07
SE505338C2 SE505338C2 (en) 1997-08-11

Family

ID=19907719

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9602265A SE505338C2 (en) 1993-12-27 1996-06-07 Telephone switching circuit controlling connection between telephone sets - having two anti parallel thyristor type semiconductors for each set with gate electrodes connected via resistor

Country Status (3)

Country Link
AU (1) AU2400395A (en)
SE (1) SE505338C2 (en)
WO (1) WO1995018502A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000376A (en) * 1975-03-31 1976-12-28 Viking Electronics, Inc. Telephone privacy device
NL7809628A (en) * 1978-09-21 1980-03-25 Nederlanden Staat SWITCH FOR MULTIPLE CONNECTED PHONES.
FI79638C (en) * 1988-06-02 1990-01-10 Ericsson Telefon Ab L M COUPLING
US5231658A (en) * 1992-02-25 1993-07-27 Vakis Eftechiou Telephone privacy device

Also Published As

Publication number Publication date
WO1995018502A1 (en) 1995-07-06
SE9602265L (en) 1996-06-07
SE505338C2 (en) 1997-08-11
AU2400395A (en) 1995-07-17

Similar Documents

Publication Publication Date Title
SE9704149D0 (en) A semiconductor device of SiC and a transistor of SiC having an insulated gate
DE3377848D1 (en) BRIDGE RECTIFIER CIRCUIT
KR970705861A (en) ELECTROSTATIC PROTECTION CIRCUIT
KR880012008A (en) Power switching circuit
KR940704085A (en) Circuit for protecting a MOSFET power transistor
DE3781327D1 (en) CIRCUIT ARRANGEMENT FOR PROTECTING THE ELECTRONIC INTERFACE CIRCUIT OF SUBSCRIBER CONNECTION CIRCUITS.
ATE40773T1 (en) CIRCUIT ARRANGEMENT FOR DRAINING OVERVOLTAGES.
ES2043892T3 (en) DEVICE THAT ALLOWS THE RESTORATION OF THE LINE CURRENT IN CASE OF MELTING OF ONE OR SEVERAL ELEMENTS OF A SERIAL MOUNTING.
DE69034065D1 (en) CIRCUITS
KR900005446A (en) Semiconductor devices
SE9602265D0 (en) Telephone Switching Circuit
KR980006260A (en) Protection element of semiconductor device
KR910020896A (en) Semiconductor integrated circuit
TR26715A (en) TERMINAL BANK FOR TELECOMMUNICATION AND DATA TECHNOLOGY
KR950020965A (en) Semiconductor devices
GB1490724A (en) Complementary storage elements in integrated circuits
KR840003165A (en) Control circuit for gate diode switch
KR910001775A (en) Semiconductor memory
KR840001423A (en) Switching network
KR960706226A (en) ELECTRICAL SWITCHING ASSEMBLY
ATE249266T1 (en) DEFIBRILLATOR
ES8500693A1 (en) Supply circuit for a variable load, particularly for a line circuit in telephone systems
SU1658321A1 (en) Device for reducing dc ripple and for output current limiting during switching in rectifiers
EP0154501A3 (en) Logic circuit
JPS6489920A (en) Superconducting current limiting switchgear

Legal Events

Date Code Title Description
NUG Patent has lapsed

Ref document number: 9602265-2

Format of ref document f/p: F