GB323558A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB323558A
GB323558A GB2899428A GB2899428A GB323558A GB 323558 A GB323558 A GB 323558A GB 2899428 A GB2899428 A GB 2899428A GB 2899428 A GB2899428 A GB 2899428A GB 323558 A GB323558 A GB 323558A
Authority
GB
United Kingdom
Prior art keywords
relay
earth
wiper
operated
trunk
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
GB2899428A
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
Priority to GB2899428A priority Critical patent/GB323558A/en
Publication of GB323558A publication Critical patent/GB323558A/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)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

323,558. Automatic Telephone Manufacturing Co., Ltd., Gillings, C., and McGavin, J. Oct. 9, 1928. Automatic exchange systems. - In order to prevent interference between automatic switches hunting over the same trunk almost simultaneously, the interrupter relay for the hunting movement is adapted on operation to disconnect entirely from the test wiper so that its locking earth is not momentarily connected to the next bank contact; in addition, the switching relay is adapted to operate rapidly by discharge from a highly inductive retard coil to reduce the unguarded period on the selected trunk. In the step-bystep selector described, during the operation of the vertical magnet, interrupter relay G operates from earth at 18 over operated contact 20 of dialling relay C and locks up to earth at 14. When relay C releases at the end of the digit, rotary magnet R operates to step the switch to the first contacts of the level, and releases G. If the first trunk is busy, G re-operates from earth on wiper 24, and locks up again, disconnecting its circuit from the wiper. When an idle trunk is found and G releases, switching relay H is rapidly operated by discharge from coil I and is held over G which does not operate. The calling loop is switched through, and relays A, B are released, but earth is maintained at 18 on the test lead and relay H until earth is fed back from the succeeding switch. All trunks busy. The wipers rotate to the eleventh contacts when springs 8 are operated, short-circuiting H and disconnecting G, and a congestion meter is operated over wiper 24. Busy tone and flash are connected up from conductor 28, relay B being held from earth at 14 to battery on 26 during the battery period.
GB2899428A 1928-10-09 1928-10-09 Improvements in or relating to telephone systems Expired GB323558A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2899428A GB323558A (en) 1928-10-09 1928-10-09 Improvements in or relating to telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2899428A GB323558A (en) 1928-10-09 1928-10-09 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB323558A true GB323558A (en) 1930-01-09

Family

ID=10284549

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2899428A Expired GB323558A (en) 1928-10-09 1928-10-09 Improvements in or relating to telephone systems

Country Status (1)

Country Link
GB (1) GB323558A (en)

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