GB257007A - Improvements in automatic telephone systems - Google Patents

Improvements in automatic telephone systems

Info

Publication number
GB257007A
GB257007A GB1298725A GB1298725A GB257007A GB 257007 A GB257007 A GB 257007A GB 1298725 A GB1298725 A GB 1298725A GB 1298725 A GB1298725 A GB 1298725A GB 257007 A GB257007 A GB 257007A
Authority
GB
United Kingdom
Prior art keywords
relay
line
release
busy
magnet
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
GB1298725A
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
Original Assignee
WESTERN 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
Application filed by WESTERN ELECTRIC CO Ltd filed Critical WESTERN ELECTRIC CO Ltd
Priority to GB1298725A priority Critical patent/GB257007A/en
Publication of GB257007A publication Critical patent/GB257007A/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

257,007. Standard Telephones & Cables, Ltd., (formerly Western Electric Co., Ltd.), and Chanter, A. J. May 18, 1925. Automatic and semi-automatic exchange systems.-In connector, the series relay C is connected to the vertical magnet V by preliminary energization of the ringing cut-off relay F over vertical off-normal springs N1 when the line and release! relays A, B first pull up, and at the end of the tens digit. when its relapse. unlocks relay F. is connected to the rotary magnet. Winding 1 of test relay G is connected to the test wiper W1 by relay C. Relay G is of twostep type and attracts only its armature 5 when the wiper passes over busy lines. If however the wanted line is busy, the relapse of relay C completes a circuit for both windings of relay G. which then sends back busy tone and flash from BF. If the line is idle, relay H is partially energized in series with the cut-off relay, cuts in its winding 2, and then sends out ringing current from RG and grounds the test wiper W1. When the subscriber replies relav F pulls up in two steps and extends the called loop to the reversing relay D. When the calling party hangs up. relays A, B. H, F. D fall back and release magnet Z is energized over the release signal wire RS.
GB1298725A 1925-05-18 1925-05-18 Improvements in automatic telephone systems Expired GB257007A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1298725A GB257007A (en) 1925-05-18 1925-05-18 Improvements in automatic telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1298725A GB257007A (en) 1925-05-18 1925-05-18 Improvements in automatic telephone systems

Publications (1)

Publication Number Publication Date
GB257007A true GB257007A (en) 1926-08-18

Family

ID=10014740

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1298725A Expired GB257007A (en) 1925-05-18 1925-05-18 Improvements in automatic telephone systems

Country Status (1)

Country Link
GB (1) GB257007A (en)

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