CH619332A5 - Signal-controlled system for optional blocking or unblocking of a transmission line, and use of the system - Google Patents

Signal-controlled system for optional blocking or unblocking of a transmission line, and use of the system Download PDF

Info

Publication number
CH619332A5
CH619332A5 CH123076A CH123076A CH619332A5 CH 619332 A5 CH619332 A5 CH 619332A5 CH 123076 A CH123076 A CH 123076A CH 123076 A CH123076 A CH 123076A CH 619332 A5 CH619332 A5 CH 619332A5
Authority
CH
Switzerland
Prior art keywords
signal
transmission line
signals
relay
detector
Prior art date
Application number
CH123076A
Other languages
German (de)
English (en)
Inventor
Duana Ridgely Bolgiano
Original Assignee
Intertel Ii Inc
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 Intertel Ii Inc filed Critical Intertel Ii Inc
Priority to CH123076A priority Critical patent/CH619332A5/de
Priority to AU13009/76A priority patent/AU499019B2/en
Priority to DE19762634112 priority patent/DE2634112A1/de
Publication of CH619332A5 publication Critical patent/CH619332A5/de

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
    • G01R23/15—Indicating that frequency of pulses is either above or below a predetermined value or within or outside a predetermined range of values, by making use of non-linear or digital elements (indicating that pulse width is above or below a certain limit)
    • 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
    • H04M1/663—Preventing unauthorised calls to a telephone set
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/436—Arrangements for screening incoming calls, i.e. evaluating the characteristics of a call before deciding whether to answer it
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
CH123076A 1976-02-02 1976-02-02 Signal-controlled system for optional blocking or unblocking of a transmission line, and use of the system CH619332A5 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CH123076A CH619332A5 (en) 1976-02-02 1976-02-02 Signal-controlled system for optional blocking or unblocking of a transmission line, and use of the system
AU13009/76A AU499019B2 (en) 1976-02-02 1976-04-14 Telephone ringer attachment
DE19762634112 DE2634112A1 (de) 1976-02-02 1976-07-29 Verfahren und schaltungsanordnung zum erkennen eines rufsignals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH123076A CH619332A5 (en) 1976-02-02 1976-02-02 Signal-controlled system for optional blocking or unblocking of a transmission line, and use of the system

Publications (1)

Publication Number Publication Date
CH619332A5 true CH619332A5 (en) 1980-09-15

Family

ID=4205525

Family Applications (1)

Application Number Title Priority Date Filing Date
CH123076A CH619332A5 (en) 1976-02-02 1976-02-02 Signal-controlled system for optional blocking or unblocking of a transmission line, and use of the system

Country Status (3)

Country Link
AU (1) AU499019B2 (en, 2012)
CH (1) CH619332A5 (en, 2012)
DE (1) DE2634112A1 (en, 2012)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2952814A1 (de) * 1978-05-30 1981-01-08 P De Toledo Monitoring device for monitoring telephone calls coming through a subscriber station
JPH03501674A (ja) * 1988-07-25 1991-04-11 アンダーソン　ジョン　ジェームス 個人信号発信電話機
DE3826100A1 (de) * 1988-08-01 1990-02-08 Licentia Gmbh Gesteuerte telefonsperreinrichtung
DE4431717C2 (de) * 1994-09-06 1997-05-07 Deutsche Telephonwerk Kabel Verfahren zur Signalisierung einer berechtigten Nutzung von Anschlußleitungen
DE19615304C2 (de) * 1996-04-18 2001-09-06 Deutsche Telekom Ag Verfahren zum selektiven Anschalten von Telekommunikationsendgeräten an ein Telekommunikationsnetz

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1283922B (de) * 1965-09-23 1968-11-28 Siemens Ag Schaltungsanordnung fuer Fernmelde-, insbesondere Fernsprechanlagen, in denen von den Teilnehmerstellen Waehlkennzeichen und Informationskennzeichen ausgesendet werden
US3514548A (en) * 1967-04-12 1970-05-26 Priva Phone Inc Telephone apparatus for discriminating between desired and undesired calls
US3686576A (en) * 1970-12-18 1972-08-22 Ibm Parallel tone detector
CA952634A (en) * 1971-01-18 1974-08-06 Robert F. Mcalonie Tone ringer
US3904830A (en) * 1972-07-03 1975-09-09 Mek Tronix Lab Call tracing and identification system
DE2351218A1 (de) * 1973-10-12 1975-04-24 Zettler Elektrotechn Alois Telefonanrufbeantworter fuer nebenstellananlagen
GB1523281A (en) * 1974-07-26 1978-08-31 Ansafone Ltd Coder and decoder devices

Also Published As

Publication number Publication date
AU1300976A (en) 1977-10-20
DE2634112C2 (en, 2012) 1990-03-29
AU499019B2 (en) 1979-04-05
DE2634112A1 (de) 1978-02-02

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Legal Events

Date Code Title Description
PL Patent ceased
PL Patent ceased