GB489755A - Improvements in or relating to electric signalling systems - Google Patents

Improvements in or relating to electric signalling systems

Info

Publication number
GB489755A
GB489755A GB1880438A GB1880438A GB489755A GB 489755 A GB489755 A GB 489755A GB 1880438 A GB1880438 A GB 1880438A GB 1880438 A GB1880438 A GB 1880438A GB 489755 A GB489755 A GB 489755A
Authority
GB
United Kingdom
Prior art keywords
clearing
signal
tandem
relating
party hangs
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
GB1880438A
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 GB489755A publication Critical patent/GB489755A/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
    • 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
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Meter Arrangements (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

489,755. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd., WRIGHT, E. P. G., and NEILSON, C. B. V. Jan. 25, 1937, No. 18804/38. Divided out of 489,545. Drawings to Specification. [Class 40 (iv)] The Specification describes a toll system identical with that described in Specification 489,545, but the claims are directed to the clearing and release arrangements. When the calling party hangs up, the signal equipment at the first exchange sends a forward clearing signal which is repeated until a backward release signal is received. The signal equipment also responds to a clearing signal sent back when the called party hangs up. When a through signalling byepath is provided at tandem, the clearing signals pass through tandem without effect. Specification 479,881 is referred to in the Provisional Specification.
GB1880438A 1937-01-25 1937-01-25 Improvements in or relating to electric signalling systems Expired GB489755A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB255237A GB489545A (en) 1937-01-25 1937-01-25 Improvements in or relating to electrical communication systems

Publications (1)

Publication Number Publication Date
GB489755A true GB489755A (en) 1938-07-25

Family

ID=9741597

Family Applications (4)

Application Number Title Priority Date Filing Date
GB1880338A Expired GB489609A (en) 1937-01-25 1937-01-25 Improvements in or relating to electrical communication exchange systems
GB255237A Expired GB489545A (en) 1937-01-25 1937-01-25 Improvements in or relating to electrical communication systems
GB1880438A Expired GB489755A (en) 1937-01-25 1937-01-25 Improvements in or relating to electric signalling systems
GB1880238A Expired GB504237A (en) 1937-01-25 1937-10-19 Improvements in or relating to electric signalling systems

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB1880338A Expired GB489609A (en) 1937-01-25 1937-01-25 Improvements in or relating to electrical communication exchange systems
GB255237A Expired GB489545A (en) 1937-01-25 1937-01-25 Improvements in or relating to electrical communication systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1880238A Expired GB504237A (en) 1937-01-25 1937-10-19 Improvements in or relating to electric signalling systems

Country Status (3)

Country Link
DE (2) DE944196C (en)
FR (1) FR832598A (en)
GB (4) GB489609A (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE476047A (en) * 1939-08-16
BE447777A (en) * 1941-11-03
BE467392A (en) * 1944-05-05
US2594719A (en) * 1945-05-19 1952-04-29 Automatic Elect Lab Voice-frequency telephone signaling system
FR956493A (en) * 1946-04-15 1950-02-02
US2564378A (en) * 1946-05-06 1951-08-14 Punch Engineering Pty Ltd Carrier system signaling circuits
FR957945A (en) * 1946-06-15 1950-02-28
US2495191A (en) * 1946-08-02 1950-01-17 Kellogg Switchboard & Supply String-of-exchanges telephone system
GB654639A (en) * 1947-02-07 1951-06-27 Standard Telephones Cables Ltd Improvements in or relating to electric signalling systems
US2579530A (en) * 1947-04-29 1951-12-25 Int Standard Electric Corp Four-wire to two-wire connecting circuit
US2566009A (en) * 1947-12-12 1951-08-28 Automatic Elect Lab Interexchange switching telephone system
GB656118A (en) * 1948-01-09 1951-08-15 Ericsson Telefon Ab L M Improvements in or relating to automatic telephone systems
US2536825A (en) * 1948-03-26 1951-01-02 Stromberg Carlson Co Multiplex telephony
US2693526A (en) * 1949-06-15 1954-11-02 Automatic Elect Lab Single channel single frequency mobile radio telephone system
US2567115A (en) * 1949-08-20 1951-09-04 Automatic Elect Lab Electronic director
GB852892A (en) * 1956-03-13 1960-11-02 Siemens Edison Swan Ltd Improvements relating to telephone systems
NL267512A (en) * 1960-07-25
CN113672424B (en) * 2021-08-19 2024-06-14 支付宝(杭州)信息技术有限公司 Method and device for repairing abnormal task

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1573991A (en) * 1924-12-17 1926-02-23 Western Electric Co Signaling system

Also Published As

Publication number Publication date
DE944196C (en) 1956-06-07
GB489609A (en) 1938-07-25
GB489545A (en) 1938-07-25
DE896667C (en) 1954-01-18
FR832598A (en) 1938-09-29
GB504237A (en) 1939-04-19

Similar Documents

Publication Publication Date Title
GB489755A (en) Improvements in or relating to electric signalling systems
GB536963A (en) Improvements in or relating to multiplex telephone systems
GB516415A (en) Improvements in or relating to automatic or semi-automatic telephone systems
GB567874A (en) Improvements in or relating to telecommunication exchange systems
GB560807A (en) Improvements in telephone or like systems
GB295449A (en) Improvements in telephone systems
GB1182509A (en) Landline Facsimile Transmission System
GB641352A (en) Improvements in or relating to teleprinter exchange systems and equipment therefor
GB513409A (en) Improvements in or relating to electrical signalling systems
GB1040833A (en) Improvements in or relating to telephone signalling systems
US2421034A (en) Telephone system
GB759692A (en) Improvements in or relating to automatic telephone systems
GB788595A (en) Improvements in or relating to automatic telecommunication exchange systems
GB549510A (en) Improvements in or relating to telephone systems
GB1029204A (en) Improvements in or relating to telephone switching systems
GB555523A (en) Bridge-stabilised oscillators for voice frequency circuits
GB1089109A (en) Signalling system for the interchange of supervisory signals between telephone exchanges
GB639141A (en) Improvements in or relating to long distance telecommunication exchanges
SE331703B (en)
GB1134459A (en) Improvements in or relating to telecommunication exchanges
CA367291A (en) Telephone, telegraph and signal system
GB458279A (en) Improvements in or relating to railway or like signalling systems
CA370964A (en) Telephone and printing telegraph signalling system
GB393662A (en) Improvements in or relating to telegraph exchange systems
GB781562A (en) Improvements in or relating to pulse distributing systems