GB1184508A - Improvements in or relating to Telephone Exchange Systems. - Google Patents

Improvements in or relating to Telephone Exchange Systems.

Info

Publication number
GB1184508A
GB1184508A GB3031968A GB3031968A GB1184508A GB 1184508 A GB1184508 A GB 1184508A GB 3031968 A GB3031968 A GB 3031968A GB 3031968 A GB3031968 A GB 3031968A GB 1184508 A GB1184508 A GB 1184508A
Authority
GB
United Kingdom
Prior art keywords
tone
main exchange
digits
automatic
common
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
GB3031968A
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB1184508A publication Critical patent/GB1184508A/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
    • H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised

Landscapes

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

Abstract

1,184,508. Automatic exchange systems. SIEMENS A.G. 25 June, 1968 [26 June, 1967], No. 30319/68. Heading H4K. In a PBX, main exchange line circuits are interrogated to detect dialling tone from the main exchange before an automatic number sender is started, and to detect equipment engaged tone from the main exchange by examining the line circuits during pauses between digits being sent. An automatic number sender is employed to send the number corresponding to an abbreviated code dialled by the calling extension. When a number sender and a main exchange line circuit have been seized and are ready to send, a common control circuit seizes a common tone detector and connects it to the main exchange line circuit. When dial tone is returned from the main exchange the tone detector starts the automatic number sender and retires. If dial tone does not appear in a given time the tone detector causes the connection of busy tone and then retires. When a main exchange line circuit is occupied with the sending of digits it marks itself available for inspection during intervals between digits and the common control circuit seizes the common tone detector to look for equipment unavailable tone returned from the main exchange. Should such a tone be detected the connection is released and busy tone is sent to the calling extension.
GB3031968A 1967-06-26 1968-06-25 Improvements in or relating to Telephone Exchange Systems. Expired GB1184508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1967S0110507 DE1293867B (en) 1967-06-26 1967-06-26 Circuit arrangement for a centrally controlled telephone system, in particular telephone branch exchange, with audible signal monitoring of the outgoing connection line

Publications (1)

Publication Number Publication Date
GB1184508A true GB1184508A (en) 1970-03-18

Family

ID=7530286

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3031968A Expired GB1184508A (en) 1967-06-26 1968-06-25 Improvements in or relating to Telephone Exchange Systems.

Country Status (6)

Country Link
BE (1) BE717181A (en)
DE (1) DE1293867B (en)
FR (1) FR1569493A (en)
GB (1) GB1184508A (en)
NL (1) NL6807815A (en)
SE (1) SE386795B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT338880B (en) * 1972-05-29 1977-09-26 Motronic Elektronische Steueru NUMBER TRANSMITTING DEVICE FOR REMOTE COMMUNICATION - IN PARTICULAR TELEPHONE SYSTEMS

Also Published As

Publication number Publication date
SE386795B (en) 1976-08-16
FR1569493A (en) 1969-05-30
BE717181A (en) 1968-12-27
DE1293867B (en) 1969-04-30
NL6807815A (en) 1968-12-27

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee