GB726867A - Improvements in or relating to circuits for use in automatic telephone systems - Google Patents

Improvements in or relating to circuits for use in automatic telephone systems

Info

Publication number
GB726867A
GB726867A GB15559/53A GB1555953A GB726867A GB 726867 A GB726867 A GB 726867A GB 15559/53 A GB15559/53 A GB 15559/53A GB 1555953 A GB1555953 A GB 1555953A GB 726867 A GB726867 A GB 726867A
Authority
GB
United Kingdom
Prior art keywords
tube
cathode
pulse
tubes
restore
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
GB15559/53A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB726867A publication Critical patent/GB726867A/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
    • H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
    • H04Q3/525—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements using tubes in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Credit Cards Or The Like (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

726,867. Automatic exchange systems. PHILIPS ELECTRICAL INDUSTRIES, Ltd. June 5, 1953 [June 10, 1952], No. 15559/53. Class 40 (4). In a system in which calls are set up over the discharge paths of gas-tubes BA, BB in the manner described in Specifications 733,577 and 725,733, including a marking circuit TS wherein the cathode of each of the tubes B6-8 is connected to both the striking electrode and the cathode of the succeeding tube by a resistance and a condenser respectively in order that the tubes may strike one at a time and in succession on the reception of dialling impulses, an auxiliary self-extinguishing tube B2 is provided to restore the marking circuit to normal in response to a larger amplitude pulse, and an additional self-extinguishing tube B3 serves to restore the first counting tube B6 to normal if the cradle switch contacts are vibrated to send further pulses when the handset is replaced. Such spurious pulses which would fire marker tube B6 are insufficient to re-operate the clearing down tube B2 because of the time-constant of condenser 21 in its cathode circuit. The striking electrode of tube B6 is, however, connected both to the cathode of the pulse repeating tube B1 and to a potentiometer R31-R33 and in consequence tube B3 which is fired by a spurious pulse and is connected across the resistors R32, R33 applies a restraining pulse to tube B6.
GB15559/53A 1952-06-10 1953-06-05 Improvements in or relating to circuits for use in automatic telephone systems Expired GB726867A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL726867X 1952-06-10

Publications (1)

Publication Number Publication Date
GB726867A true GB726867A (en) 1955-03-23

Family

ID=19817842

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15559/53A Expired GB726867A (en) 1952-06-10 1953-06-05 Improvements in or relating to circuits for use in automatic telephone systems

Country Status (4)

Country Link
US (1) US2801369A (en)
DE (1) DE924516C (en)
FR (1) FR1083585A (en)
GB (1) GB726867A (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2426279A (en) * 1942-04-30 1947-08-26 Ncr Co Electronic accumulator
GB601148A (en) * 1943-12-27 1948-04-28 Ncr Co Improvements in or relating to apparatus for generating electrical impulses

Also Published As

Publication number Publication date
FR1083585A (en) 1955-01-11
US2801369A (en) 1957-07-30
DE924516C (en) 1955-03-03

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