GB543065A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB543065A
GB543065A GB12629/40A GB1262940A GB543065A GB 543065 A GB543065 A GB 543065A GB 12629/40 A GB12629/40 A GB 12629/40A GB 1262940 A GB1262940 A GB 1262940A GB 543065 A GB543065 A GB 543065A
Authority
GB
United Kingdom
Prior art keywords
relay
board
dialling
line
permit
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
GB12629/40A
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
Priority to BE468834D priority Critical patent/BE468834A/xx
Application filed by Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB12629/40A priority patent/GB543065A/en
Priority to US398006A priority patent/US2307818A/en
Publication of GB543065A publication Critical patent/GB543065A/en
Priority to FR934998D priority patent/FR934998A/en
Priority to FR1193659D priority patent/FR1193659A/en
Priority to NL286050A priority patent/NL125346C/xx
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses
    • H04Q1/36—Pulse-correcting arrangements, e.g. for reducing effects due to interference

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

543,065. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., and BEALE, C. E. Aug. 6, 1940, No. 12629. [Class 40 (iv)] In a repeater of the kind having repeating coils RPC, the feed relay A on the incoming side is connected to the line through a ballast resistance lamp BRA which is short-circuited during impulse repetition by the usual dialling relay C in order to prevent distortion of the repeated impulses. Relay C also provides a direct impulsing loop on the outgoing side. The arrangement is suitable for terminating a long extension line at a P.B.X. board to permit through-dialling to take place when the board is left unattended with the line connected to the public exchange. Relay A serves to give a calling signal when the P.B.X. board is attended, and its operation by ringing current on an incoming call is obviated by rectifiers MRA, MRB normally in series therewith. The impulse repeating contacts a2 which are normally short-circuited to permit ringing are of the makebefore-break type and are shunted by a resistance YB and condenser QC for spark quenching.
GB12629/40A 1940-08-06 1940-08-06 Improvements in or relating to telephone systems Expired GB543065A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE468834D BE468834A (en) 1940-08-06
GB12629/40A GB543065A (en) 1940-08-06 1940-08-06 Improvements in or relating to telephone systems
US398006A US2307818A (en) 1940-08-06 1941-06-14 Telephone system
FR934998D FR934998A (en) 1940-08-06 1946-10-21 Telephone pulse repeater
FR1193659D FR1193659A (en) 1940-08-06 1957-08-08 Poly-ester products and their manufacture
NL286050A NL125346C (en) 1940-08-06 1962-11-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB12629/40A GB543065A (en) 1940-08-06 1940-08-06 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB543065A true GB543065A (en) 1942-02-09

Family

ID=10008213

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12629/40A Expired GB543065A (en) 1940-08-06 1940-08-06 Improvements in or relating to telephone systems

Country Status (4)

Country Link
US (1) US2307818A (en)
BE (1) BE468834A (en)
FR (1) FR934998A (en)
GB (1) GB543065A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL66024C (en) * 1944-06-02
US2607854A (en) * 1947-07-22 1952-08-19 Automatic Elect Lab Automatic toll telephone system
US2596025A (en) * 1948-01-03 1952-05-06 Ericsson Telefon Ab L M Signaling over telephone lines by means of a nonlinear resistance
US3003040A (en) * 1956-01-25 1961-10-03 Gen Dynamics Corp Modified trunk circuit

Also Published As

Publication number Publication date
BE468834A (en)
FR934998A (en) 1948-06-07
US2307818A (en) 1943-01-12

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