GB238245A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB238245A
GB238245A GB19855/25A GB1985525A GB238245A GB 238245 A GB238245 A GB 238245A GB 19855/25 A GB19855/25 A GB 19855/25A GB 1985525 A GB1985525 A GB 1985525A GB 238245 A GB238245 A GB 238245A
Authority
GB
United Kingdom
Prior art keywords
switch
over
relay
circuit
test conductor
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
GB19855/25A
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 Manufacturing Co Ltd
Original Assignee
Automatic Telephone Manufacturing 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
Application filed by Automatic Telephone Manufacturing Co Ltd filed Critical Automatic Telephone Manufacturing Co Ltd
Publication of GB238245A publication Critical patent/GB238245A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

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

Abstract

238,245. Automatic Telephone Manufacturing Co., Ltd., (Assignees of Wicks, J.). Dec. 14, 1923, [Convention date]. Drawings to Specification. Automatic exchange systems; metering.-In a two-co-ordinate switch for use in svstems in which guarding potential is fed forward from the first switch of a series, the circuit for both driving magnets includes the test conductor extending to the preceding switch. The slow-release change-over relay is also held energized during the intermittent de-energizations of the line relay, over a circuit which includes the grounded test conductor. According to another feature, the change-over relay of a connector is also arranged to cut off the ringing current when the wanted party replies. The invention is described as applied to group selectors and connectors in a system which is identical with part of the system described in Specification 226,154 which claims other features.
GB19855/25A 1923-12-14 1924-06-18 Improvements in or relating to telephone systems Expired GB238245A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US238245XA 1923-12-14 1923-12-14

Publications (1)

Publication Number Publication Date
GB238245A true GB238245A (en) 1925-09-18

Family

ID=21817415

Family Applications (2)

Application Number Title Priority Date Filing Date
GB19855/25A Expired GB238245A (en) 1923-12-14 1924-06-18 Improvements in or relating to telephone systems
GB14772/24A Expired GB226154A (en) 1923-12-14 1924-06-18 Improvements in or relating to telephone systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB14772/24A Expired GB226154A (en) 1923-12-14 1924-06-18 Improvements in or relating to telephone systems

Country Status (2)

Country Link
US (1) US1667405A (en)
GB (2) GB238245A (en)

Also Published As

Publication number Publication date
GB226154A (en) 1925-09-17
US1667405A (en) 1928-04-24

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