GB253972A - Improvements in automatic or semi-automatic telephone systems - Google Patents

Improvements in automatic or semi-automatic telephone systems

Info

Publication number
GB253972A
GB253972A GB673925A GB673925A GB253972A GB 253972 A GB253972 A GB 253972A GB 673925 A GB673925 A GB 673925A GB 673925 A GB673925 A GB 673925A GB 253972 A GB253972 A GB 253972A
Authority
GB
United Kingdom
Prior art keywords
relay
train
test
automatic
connector
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
GB673925A
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.)
WESTERN ELECTRIC CO Ltd
AT&T Corp
Original Assignee
WESTERN ELECTRIC CO Ltd
Western Electric Co Inc
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 WESTERN ELECTRIC CO Ltd, Western Electric Co Inc filed Critical WESTERN ELECTRIC CO Ltd
Priority to GB673925A priority Critical patent/GB253972A/en
Publication of GB253972A publication Critical patent/GB253972A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

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

Abstract

253,972. Standard Telephones & Cables, Ltd., (formerly Western Electric Co., Ltd.), and Gould, J. R. March 12, 1925. Automatic and semi-automatic exchange systems.-In a test or trunk-offering distributor switch, the switching relay H energizes over the forward loop to the succeeding switch. When the switch is taken into use by an operator, line and release relays A, B energize, and the first train of impulses are repeated to the vertical magnet V. series relay C relapsing at the end of the train to connect up the rotary magnet R, which responds to the second train. Series relay E operates during this train, making the driving circuit independent of test relay G, and energizing this relay, and falls back when the wanted connector is reached. If this is in use, relay G is held by ground over the test wiper, so that the rotary magnet circuit is maintained open and busy tone is sent back. If the wanted connector is free, relay G falls back and grounds the test wiper. Switching relay H energizes over the line wipers in series with the line relay of the connector, and subsequently locks over the test wiper when ground is returned back thereover.
GB673925A 1925-03-12 1925-03-12 Improvements in automatic or semi-automatic telephone systems Expired GB253972A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB673925A GB253972A (en) 1925-03-12 1925-03-12 Improvements in automatic or semi-automatic telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB673925A GB253972A (en) 1925-03-12 1925-03-12 Improvements in automatic or semi-automatic telephone systems

Publications (1)

Publication Number Publication Date
GB253972A true GB253972A (en) 1926-06-14

Family

ID=9819893

Family Applications (1)

Application Number Title Priority Date Filing Date
GB673925A Expired GB253972A (en) 1925-03-12 1925-03-12 Improvements in automatic or semi-automatic telephone systems

Country Status (1)

Country Link
GB (1) GB253972A (en)

Similar Documents

Publication Publication Date Title
GB253972A (en) Improvements in automatic or semi-automatic telephone systems
GB283971A (en) Improvements in electric circuits for central telephone offices
US2742529A (en) Trunk and control circuits to semiautomatic magneto exchange
US1542105A (en) Measured-service automatic telephone system
GB257310A (en) Improvements in automatic and semi-automatic telephone systems
GB329028A (en) Improvements in or relating to automatic and semi-automatic telephone systems
GB227931A (en) Improved circuit arrangements for selectors in automatic telephone systems
GB282186A (en) Improved circuit arrangements for hunting switches in automatic and semi-automatic telephone systems
GB284811A (en) Improvements in or relating to automatic telephone systems
GB253575A (en) Improvements in automatic or semi-automatic telephone systems
GB271142A (en) Improved circuit arrangements for selectors in automatic and semi-automatic telephone systems
GB390868A (en) Improvements in telephone systems
GB282153A (en) Improvements in telephone systems
GB232702A (en) Improvements in or relating to semi-automatic telephone systems
GB233792A (en) Improvements in or relating to semi-automatic telephone systems
GB479881A (en) Improvements in or relating to electrical communication systems
GB267608A (en) Improvements in or relating to telephone systems
GB302441A (en) Improved circuit arrangements in automatic or semi-automatic telephone systems
GB233467A (en) Improvements in or relating to automatic or semi-automatic telephone systems
GB296304A (en) Improvements in or relating to telephone systems
GB180331A (en) Improvements in or relating to automatic switches for use in telephone systems
GB324952A (en) Improvements in or relating to telephone systems
GB231335A (en) Improvements in or relating to telephone systems employing selecting devices
GB250037A (en) Improvements in or relating to telephone systems
GB251387A (en) Improvements in automatic or semi-automatic telephone systems