GB326571A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB326571A
GB326571A GB3771728A GB3771728A GB326571A GB 326571 A GB326571 A GB 326571A GB 3771728 A GB3771728 A GB 3771728A GB 3771728 A GB3771728 A GB 3771728A GB 326571 A GB326571 A GB 326571A
Authority
GB
United Kingdom
Prior art keywords
relating
telephone systems
combination
junction
relays
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
GB3771728A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3771728A priority Critical patent/GB326571A/en
Publication of GB326571A publication Critical patent/GB326571A/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
    • H04Q1/45—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

Abstract

326,571. Standard Telephones & Cables, Ltd., and Skillman, T. S. Dec. 20, 1928. Semi-automatic exchange systems.-The selection of a particular jack Ja - - J<c> at the outgoing end of a. junction causes a pulse of a particular combination of three out of four voice-frequencies W - - Z to be transmitted over the junction to effect at the incoming end, by means of tuned relays WV - - ZV and combination-responsive relays 6<a> - - 6<c>, the starting of a particular group of call-finders LF<a> - - LF<c> whereby the connection is extended to one of a number of further exchanges. Specification 326,570 is referred to.
GB3771728A 1928-12-20 1928-12-20 Improvements in or relating to telephone systems Expired GB326571A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3771728A GB326571A (en) 1928-12-20 1928-12-20 Improvements in or relating to telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3771728A GB326571A (en) 1928-12-20 1928-12-20 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB326571A true GB326571A (en) 1930-03-20

Family

ID=10398525

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3771728A Expired GB326571A (en) 1928-12-20 1928-12-20 Improvements in or relating to telephone systems

Country Status (1)

Country Link
GB (1) GB326571A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740481C (en) * 1934-04-28 1943-10-21 Fernmeldetechnische Staatswerk Circuit arrangement for tone frequency selection in telecommunications systems

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740481C (en) * 1934-04-28 1943-10-21 Fernmeldetechnische Staatswerk Circuit arrangement for tone frequency selection in telecommunications systems

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