GB584725A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB584725A
GB584725A GB1411246A GB1411246A GB584725A GB 584725 A GB584725 A GB 584725A GB 1411246 A GB1411246 A GB 1411246A GB 1411246 A GB1411246 A GB 1411246A GB 584725 A GB584725 A GB 584725A
Authority
GB
United Kingdom
Prior art keywords
signals
relay set
tandem
signal
unresponsive
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
GB1411246A
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co Ltd
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
Priority to NL63766D priority Critical patent/NL63766C/xx
Priority to BE467332D priority patent/BE467332A/xx
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB1411246A priority patent/GB584725A/en
Priority to GB12678/45A priority patent/GB592333A/en
Priority to FR932147D priority patent/FR932147A/en
Publication of GB584725A publication Critical patent/GB584725A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)

Abstract

584,725. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., BEALE, C. E., and HOPLEY, H. E. May 5, 1944, No. 14112/46. Divided out of 584,677. Drawings to Specification. [Class 40 (iv)] The Specification describes a system identical with that described in Specification 584,677, but the claims are directed to the feature of through V.F. signalling at a tandem exchange. Seizure of an outgoing relay set from a group selector by a direct loop over the speaking leads on a tandem call causes the seizing signal to be sent, after which the relay set is rendered unresponsive to all signals except the release signal. Moreover, a backward signal consisting of a momentary reversal of current renders the incoming relay set unresponsive to all signals except the long release signal, so that V.F. signals pass through the tandem exchange without conversion to and from D.C. signals.
GB1411246A 1944-05-05 1944-05-05 Improvements in or relating to telephone systems Expired GB584725A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL63766D NL63766C (en) 1944-05-05
BE467332D BE467332A (en) 1944-05-05
GB1411246A GB584725A (en) 1944-05-05 1944-05-05 Improvements in or relating to telephone systems
GB12678/45A GB592333A (en) 1944-05-05 1945-05-19 Improvements in or relating to telephone systems
FR932147D FR932147A (en) 1944-05-05 1946-08-10 Telephone device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1411246A GB584725A (en) 1944-05-05 1944-05-05 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB584725A true GB584725A (en) 1947-01-21

Family

ID=10035202

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1411246A Expired GB584725A (en) 1944-05-05 1944-05-05 Improvements in or relating to telephone systems
GB12678/45A Expired GB592333A (en) 1944-05-05 1945-05-19 Improvements in or relating to telephone systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB12678/45A Expired GB592333A (en) 1944-05-05 1945-05-19 Improvements in or relating to telephone systems

Country Status (4)

Country Link
BE (1) BE467332A (en)
FR (1) FR932147A (en)
GB (2) GB584725A (en)
NL (1) NL63766C (en)

Also Published As

Publication number Publication date
GB592333A (en) 1947-09-15
NL63766C (en)
BE467332A (en)
FR932147A (en) 1948-03-12

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