GB299295A - A system of connections for telephone installations - Google Patents

A system of connections for telephone installations

Info

Publication number
GB299295A
GB299295A GB4646/28A GB464628A GB299295A GB 299295 A GB299295 A GB 299295A GB 4646/28 A GB4646/28 A GB 4646/28A GB 464628 A GB464628 A GB 464628A GB 299295 A GB299295 A GB 299295A
Authority
GB
United Kingdom
Prior art keywords
relay
rectifier
signal frequency
filter
frequencies
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
GB4646/28A
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
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 Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB299295A publication Critical patent/GB299295A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

299,295. Siemens & Halske Akt.- Ges. Oct. 22, 1927, [Convention date]. Manual exchange systems. - In systems in which signals are transmitted over a telephone line by alternating currents of a frequency within the voice range, the receiving arrangements comprise linked rectifiers I, II, associated with filter circuits F1, F2, the latter of which passes only the signal frequency whilst the former passes all other frequencies but rejects the signal frequency. Signal currents passing through filter F2 and rectifier II operate relay M, but if other frequencies are, present the operation of rectifier I renders rectifier II non-conducting so that a momentary speech current of signal frequency will not operate relay M. A high resistance and condenser in the grid circuit of the rectifier II render the current in relay M independent of changes in the amplitude of the signal frequency, provided this is above a definite critical value. An amplifier may be inserted between filter F1 and transformer Ue3. The Specification as open to inspection under Sect. 91 (3) (a) comprises also an arrangement in which the anode circuit of the rectifier I includes a relay controlling normally-closed contacts in series with relay M or with a further relay controlled by relay M. This subjectmatter does not appear in the Specification as accepted.
GB4646/28A 1927-10-22 1928-02-14 A system of connections for telephone installations Expired GB299295A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE299295X 1927-10-22

Publications (1)

Publication Number Publication Date
GB299295A true GB299295A (en) 1929-04-04

Family

ID=6091203

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4646/28A Expired GB299295A (en) 1927-10-22 1928-02-14 A system of connections for telephone installations

Country Status (1)

Country Link
GB (1) GB299295A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6461707B1 (en) 1997-09-26 2002-10-08 Avery Dennison Corporation Faceless pressure-sensitive adhesive construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6461707B1 (en) 1997-09-26 2002-10-08 Avery Dennison Corporation Faceless pressure-sensitive adhesive construction

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