GB598225A - Improvements in or relating to telecommunication systems - Google Patents

Improvements in or relating to telecommunication systems

Info

Publication number
GB598225A
GB598225A GB1974346A GB1974346A GB598225A GB 598225 A GB598225 A GB 598225A GB 1974346 A GB1974346 A GB 1974346A GB 1974346 A GB1974346 A GB 1974346A GB 598225 A GB598225 A GB 598225A
Authority
GB
United Kingdom
Prior art keywords
relating
telecommunication systems
automatic
automatic exchange
sender
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
GB1974346A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB598225A publication Critical patent/GB598225A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

598,225. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd. March 30, 1945, No. 19743/46. Convention date, May 1, 1944. Divided out of 598,188. Drawings to Specification. [Class 40 (iv)] Describes an automatic or semi-automatic exchange system identical with that described in Specification 598,188, but the claims are directed to the key-sender, which is the controlling device of that Specification, and to its manner of operation.
GB1974346A 1944-05-01 1945-03-30 Improvements in or relating to telecommunication systems Expired GB598225A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US53346644A 1944-05-01 1944-05-01

Publications (1)

Publication Number Publication Date
GB598225A true GB598225A (en) 1948-02-12

Family

ID=32682661

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1974346A Expired GB598225A (en) 1944-05-01 1945-03-30 Improvements in or relating to telecommunication systems
GB812945A Expired GB598188A (en) 1944-05-01 1945-03-30 Improvements in or relating to telecommunication systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB812945A Expired GB598188A (en) 1944-05-01 1945-03-30 Improvements in or relating to telecommunication systems

Country Status (3)

Country Link
FR (1) FR939058A (en)
GB (2) GB598225A (en)
NL (1) NL70732C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE967287C (en) * 1954-04-05 1957-10-31 Siemens Ag Circuit arrangement for keyboard selection in telecommunications systems, in particular telephone systems

Also Published As

Publication number Publication date
NL70732C (en)
GB598188A (en) 1948-02-12
FR939058A (en) 1948-11-03

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