ES8502826A1 - Perfeccionamientos en los sistemas telefonicos - Google Patents

Perfeccionamientos en los sistemas telefonicos

Info

Publication number
ES8502826A1
ES8502826A1 ES530736A ES530736A ES8502826A1 ES 8502826 A1 ES8502826 A1 ES 8502826A1 ES 530736 A ES530736 A ES 530736A ES 530736 A ES530736 A ES 530736A ES 8502826 A1 ES8502826 A1 ES 8502826A1
Authority
ES
Spain
Prior art keywords
sensor
telephone line
electronic padlock
subscriber
subscriber telephone
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
ES530736A
Other languages
English (en)
Other versions
ES530736A0 (es
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Italtel SpA
Original Assignee
Italtel SpA
Italtel Societa Italiana Telecomunicazioni SpA
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 Italtel SpA, Italtel Societa Italiana Telecomunicazioni SpA filed Critical Italtel SpA
Publication of ES8502826A1 publication Critical patent/ES8502826A1/es
Publication of ES530736A0 publication Critical patent/ES530736A0/es
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/667—Preventing unauthorised calls from a telephone set
    • H04M1/67—Preventing unauthorised calls from a telephone set by electronic means
    • H04M1/673—Preventing unauthorised calls from a telephone set by electronic means the user being required to key in a code

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Telephone Function (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PERFECCIONAMIENTOS EN LOS SISTEMAS TELEFONICOS.COMPRENDEN UN SENSOR (SS), CONECTADO A LA LINEA TELEFONICA, PARA EMITIR LA PRIMERA SEN/AL (S), CUYO NIVEL ES INDICE DEL ESTADO EN QUE SE ENCUENTRA LA LINEA TELEFONICA MISMA; UNA UNIDAD LOGICA (UL) PARA MEMORIZAR UNA DETERMINADA COMBINACION DE CIFRAS; UN CIRCUITO UMBRAL (Z1, R1) CONECTADO CON EL TERMINAL TELEFONICO, EN PARALELO; UN RAMAN/ ELECTRICO INHIBIDOR (T1), QUE SE CONECTA EN PARALELO CON EL TERMINAL TELEFONICO (TL) POR MANDO DE LA UNIDAD LOGICA (UL) Y POR EL CIRCUITO UMBRAL CITADO (Z1, R1) Y UNA UNIDAD DE ALIMENTACION (UA) PARA SACAR LA ENERGIA DE LA LINEA TELEFONICA.
ES530736A 1983-03-21 1984-03-16 Perfeccionamientos en los sistemas telefonicos Granted ES530736A0 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT8320173A IT1207459B (it) 1983-03-21 1983-03-21 Lucchetto elettronico per lineaa telefonica d'utente.

Publications (2)

Publication Number Publication Date
ES8502826A1 true ES8502826A1 (es) 1985-02-01
ES530736A0 ES530736A0 (es) 1985-02-01

Family

ID=11164410

Family Applications (1)

Application Number Title Priority Date Filing Date
ES530736A Granted ES530736A0 (es) 1983-03-21 1984-03-16 Perfeccionamientos en los sistemas telefonicos

Country Status (4)

Country Link
EP (1) EP0126496A3 (es)
DE (1) DE126496T1 (es)
ES (1) ES530736A0 (es)
IT (1) IT1207459B (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2070053A2 (es) * 1992-12-10 1995-05-16 Solac Telecom Sa Telefono con discriminador de llamadas.

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8516398D0 (en) * 1985-06-28 1985-07-31 Newell T J Telephone line access control
FR2595526A1 (fr) * 1986-03-07 1987-09-11 Centomo Jean Louis Dispositif antiviol de ligne telephonique
AU7517887A (en) * 1986-06-13 1988-01-11 Keith Askham Telephone security system
FR2621437B1 (fr) * 1987-10-01 1990-01-05 Genin Jacques Dispositif de protection de ligne telephonique a dipole actif
FR2655224B1 (fr) * 1989-11-24 1995-06-02 Marc Regnier Dispositif de protection d'une ligne d'abonne contre un branchement illicite.
EP0454262A1 (en) * 1990-04-26 1991-10-30 Koninklijke KPN N.V. Electronic circuit for signalling and/or preventing improper use of a telephone subscriber line

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1569257A (en) * 1975-11-17 1980-06-11 Murray L Q Of a telephone instrument telephone security device for preventing unauthorised use
AU525240B2 (en) * 1977-08-01 1982-10-28 Peter Samuel Vogel Telephone security system
CH628762A5 (de) * 1978-06-12 1982-03-15 Sodeco Compteurs De Geneve Schaltungsanordnung fuer fernsprechteilnehmerstellen zur erfassung von waehlimpulsen.
GB2086187A (en) * 1980-10-09 1982-05-06 Standard Telephones Cables Ltd Toll barring
US4358640A (en) * 1980-11-25 1982-11-09 Murray Leonard Q Telephone security device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2070053A2 (es) * 1992-12-10 1995-05-16 Solac Telecom Sa Telefono con discriminador de llamadas.

Also Published As

Publication number Publication date
DE126496T1 (de) 1985-02-28
ES530736A0 (es) 1985-02-01
IT1207459B (it) 1989-05-25
EP0126496A3 (en) 1985-05-15
IT8320173A0 (it) 1983-03-21
EP0126496A2 (en) 1984-11-28

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19981001