CA953043A - Device for the detection of signals in continuous current for systems for push button selection to be used in switched telephone exchanges - Google Patents

Device for the detection of signals in continuous current for systems for push button selection to be used in switched telephone exchanges

Info

Publication number
CA953043A
CA953043A CA133,599A CA133599A CA953043A CA 953043 A CA953043 A CA 953043A CA 133599 A CA133599 A CA 133599A CA 953043 A CA953043 A CA 953043A
Authority
CA
Canada
Prior art keywords
signals
systems
detection
push button
switched 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
CA133,599A
Other languages
English (en)
Other versions
CA133599S (en
Inventor
Franco De Marco
Carlo A. Manghi
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
Societa Italiana Telecomunicazioni Siemens 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 Societa Italiana Telecomunicazioni Siemens SpA filed Critical Societa Italiana Telecomunicazioni Siemens SpA
Application granted granted Critical
Publication of CA953043A publication Critical patent/CA953043A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • 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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H04Q1/4535—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted with an additional signal transmitted for voice protection

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
CA133,599A 1971-06-22 1972-01-31 Device for the detection of signals in continuous current for systems for push button selection to be used in switched telephone exchanges Expired CA953043A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT724171 1971-06-22

Publications (1)

Publication Number Publication Date
CA953043A true CA953043A (en) 1974-08-13

Family

ID=11124900

Family Applications (1)

Application Number Title Priority Date Filing Date
CA133,599A Expired CA953043A (en) 1971-06-22 1972-01-31 Device for the detection of signals in continuous current for systems for push button selection to be used in switched telephone exchanges

Country Status (6)

Country Link
US (1) US3828141A (de)
AT (1) AT318019B (de)
BR (1) BR7204027D0 (de)
CA (1) CA953043A (de)
CH (1) CH539371A (de)
DE (1) DE2162898A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4071708A (en) * 1976-11-11 1978-01-31 Telesciences, Inc. Dial pulse detector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL109525C (de) * 1957-03-14
CH379584A (de) * 1958-09-03 1964-07-15 Standard Telephon & Radio Ag Elektrische Signalisier-Einrichtung
NL6604015A (de) * 1966-03-26 1967-09-27
DE1487991B2 (de) * 1966-08-23 1970-06-04 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zur Weitergabe von Wahlinformationen in Vermittlungsanlagen mit Direktwahl in Fernmelde-, insbesondere Fernsprechanlagen
SE331496B (de) * 1968-11-05 1971-01-04 Ericsson Telefon Ab L M

Also Published As

Publication number Publication date
DE2162898A1 (de) 1972-12-28
BR7204027D0 (pt) 1973-05-10
CH539371A (it) 1973-07-15
US3828141A (en) 1974-08-06
AT318019B (de) 1974-09-25

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