GB226782A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB226782A
GB226782A GB25664/24A GB2566424A GB226782A GB 226782 A GB226782 A GB 226782A GB 25664/24 A GB25664/24 A GB 25664/24A GB 2566424 A GB2566424 A GB 2566424A GB 226782 A GB226782 A GB 226782A
Authority
GB
United Kingdom
Prior art keywords
relay
energizes
wiper
relays
terminal
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
GB25664/24A
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
Publication of GB226782A publication Critical patent/GB226782A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

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

Abstract

226,782. Western Electric Co., Ltd., (Assignees of Smythe, E. H.). Dec. 24, 1923, [Convention date]. Automatic exchange systems.-The terminals of a connector are divided into groups of unequal size, serving, for example, different Private Branch Exchanges and the wipers are stepped to the wanted group under control of a counting chain built up by the final digit. With this arrangement, all subscribers can be numbered consecutively, and no alteration in numbering is necessary when the size of a P.B.X. group is altered. When the subscriber A reaches the connector shown, relays 3, 4, pull up, and relay 5 repeats the final digit to the counting relays 7, 9, 17 - - 20, &c., which lock up in succession, two for each impulse, and ground terminals in the path of wiper 8 of the connector. Relay 10 pulls up over wiper 8 and energizes the self-interrupting stepping-magnet 12. When wiper 8 leaves the terminal, relay 10 falls back, but re-energizes to cause a further step when the next terminal is encountered. When an ungrounded terminal is reached, relay 10 fails to re-energize, and relay 11 which was energized in parallel with the stepping magnet falls back sluggishly and energizes relays 6, 22. Relay 6 locks up, disconnects the left hand winding of relay 22, and releases the counting relays. Relay 22 connects relay 10 to the test wiper 15 over its own right-hand winding so that the switch hunts for an idle line, the test terminal of which being ungrounded, relay 10 fails to re-energize and the sluggish relapse of relay 22 energizes relay 32 in series with the cut-off relay (e.g. 31). Relay 32 energizes ringing relay 35. The reply of the called party causes relay 33 to remove a short-circuit from switching-relay 34 which locks up and shortcircuits ringing relay 35. Release. Relay 29 which is energized on the relapse of relays 3, 4, energizes the stepping magnet over off-normal springs 16. the change over of which completes the release. Busy tone. If all the lines are busy, wiper 15 moves on to a terminal such as 38 to energize relay 39 which connects up busy transformer 40. Relay 32 is unable to energize in series with relay 39.
GB25664/24A 1923-12-24 1924-10-28 Improvements in or relating to telephone systems Expired GB226782A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US682368A US1567305A (en) 1923-12-24 1923-12-24 Telephone system

Publications (1)

Publication Number Publication Date
GB226782A true GB226782A (en) 1925-12-03

Family

ID=24739387

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25664/24A Expired GB226782A (en) 1923-12-24 1924-10-28 Improvements in or relating to telephone systems

Country Status (3)

Country Link
US (1) US1567305A (en)
FR (1) FR590656A (en)
GB (1) GB226782A (en)

Also Published As

Publication number Publication date
FR590656A (en) 1925-06-20
US1567305A (en) 1925-12-29

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