GB555096A - Improvements in or relating to automatic telephone systems - Google Patents

Improvements in or relating to automatic telephone systems

Info

Publication number
GB555096A
GB555096A GB1320/42A GB132042A GB555096A GB 555096 A GB555096 A GB 555096A GB 1320/42 A GB1320/42 A GB 1320/42A GB 132042 A GB132042 A GB 132042A GB 555096 A GB555096 A GB 555096A
Authority
GB
United Kingdom
Prior art keywords
switch
link
relay
magnet
hfs
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
GB1320/42A
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
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB1320/42A priority Critical patent/GB555096A/en
Priority to US467316A priority patent/US2355431A/en
Publication of GB555096A publication Critical patent/GB555096A/en
Priority to FR935516D priority patent/FR935516A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Structure Of Telephone Exchanges (AREA)

Abstract

555,096. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., GILLINGS, C., and MURRAY, L. J. Jan. 30, 1942, No. 1320. [Class 40 (iv)] A system for 20 subscribers, in which a single cross-bar switch is used to connect the calling and called lines to opposite ends of a link circuit, employs two common circuits of which one selects an idle link and controls the connection of the calling line thereto and the other operates in conjunction with a marker to control the connection of the link to the wanted-line. Four links AL ... DL are provided, as shown in Fig. 4, and each link is. individual to a pair of selecting magnets such as DOP, DIP in the cross-bar switch, the holding magnets KH being individual to subscribers' lines. On the initiation of a call, a common switch HFS hunts first for an idle link, connecting up its magnet DOP, and then for the calling line, connecting up its holding magnet KH which serves also as the cut-off relay. Dialled impulses step a 25-point switch DS individual to the link, the first digit 1 or 2 operating a relay AD or BD which advances the switch to the appropriate starting position for the second impulse train. When both digits have been received, a common switch SC hunts for the link and gives it exclusive use of the cross-bar switch. If the switch HFS is in use at this time the subsequent operations are delayed, and similarly while the switch SC is in use the starting circuit for the switch HFS is opened. The selecting magnet DIP operates and if the wanted line is idle test relay SK energizes over the switch DS and connects up the appropriate holding magnet KH also over DS. Ringing takes place and the connection is completed upon reply. If the wanted is busy, or if the first dialled digit is other than 1 or 2, relay G operates to give a busy signal.
GB1320/42A 1942-01-30 1942-01-30 Improvements in or relating to automatic telephone systems Expired GB555096A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1320/42A GB555096A (en) 1942-01-30 1942-01-30 Improvements in or relating to automatic telephone systems
US467316A US2355431A (en) 1942-01-30 1942-11-30 Telephone or like system
FR935516D FR935516A (en) 1942-01-30 1946-10-31 Telephone device or transmission anologue

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1320/42A GB555096A (en) 1942-01-30 1942-01-30 Improvements in or relating to automatic telephone systems

Publications (1)

Publication Number Publication Date
GB555096A true GB555096A (en) 1943-08-04

Family

ID=9719942

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1320/42A Expired GB555096A (en) 1942-01-30 1942-01-30 Improvements in or relating to automatic telephone systems

Country Status (3)

Country Link
US (1) US2355431A (en)
FR (1) FR935516A (en)
GB (1) GB555096A (en)

Also Published As

Publication number Publication date
US2355431A (en) 1944-08-08
FR935516A (en) 1948-06-22

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