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GB629572A - Apparatus for establishing telephone connections - Google Patents

Apparatus for establishing telephone connections

Info

Publication number
GB629572A
GB629572A GB21758/47A GB2175847A GB629572A GB 629572 A GB629572 A GB 629572A GB 21758/47 A GB21758/47 A GB 21758/47A GB 2175847 A GB2175847 A GB 2175847A GB 629572 A GB629572 A GB 629572A
Authority
GB
United Kingdom
Prior art keywords
frequencies
allocated
register
class
transmission
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
GB21758/47A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB629572A publication Critical patent/GB629572A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • 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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
    • H04Q5/02—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with direct connection for all subscribers, i.e. party-line systems
    • H04Q5/06—Signalling by amplitude or polarity of DC

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

629,572. Automatic exchange systems. WESTERN ELECTRIC CO., Inc. Aug.. 7, 1947, No. 21758. Convention date, Sept. 24, 1938. Drawings to Specification. [Class 40 (iv)] All the digits of a subscriber's number are transmitted simultaneously in a single pulse consisting of a combination of voice frequency currents. As described, 16 frequencies are allocated for the transmission of a 4-digit number, 4 frequencies being allocated to each digital position, the individual digits of which are characterized by different combinations of two out of the four frequencies. The invention is described with reference to the transmission of wanted subscriber's numbers between two exchangers of revertive control type, the V.F. pulse being transmitted from a register at the originating exchange to set 4 sets of 4 storage relays in a register at the receiving exchange, each set being used in turn to determine the point of entry into a relay chain which is then run down by revertive impulses during the setting of the selector switches in the usual manner. Specification 176,889, [Class 40 (iv)], is referred to.
GB21758/47A 1938-09-24 1947-08-07 Apparatus for establishing telephone connections Expired GB629572A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US629572XA 1938-09-24 1938-09-24
US231477A US2206538A (en) 1938-09-24 1938-09-24 Telephone system

Publications (1)

Publication Number Publication Date
GB629572A true GB629572A (en) 1949-09-22

Family

ID=26742909

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21758/47A Expired GB629572A (en) 1938-09-24 1947-08-07 Apparatus for establishing telephone connections

Country Status (2)

Country Link
US (1) US2206538A (en)
GB (1) GB629572A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665833A (en) * 1976-11-03 1987-05-19 Fleishman Herman B Miniature electric track and train

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB586753A (en) * 1943-01-22 1947-03-31 Ericsson Telefon Ab L M Improvements in or relating to automatic telephone systems
CH268997A (en) * 1946-01-18 1950-06-15 Standard Telephon & Radio Ag Electric signal system.
US2483445A (en) * 1946-12-13 1949-10-04 Standard Telephones Cables Ltd Transmitter system
US2639417A (en) * 1947-01-27 1953-05-19 British Telecomm Res Ltd Selector
US2602853A (en) * 1947-08-07 1952-07-08 Bell Telephone Labor Inc Selective signaling system
US2470145A (en) * 1947-09-25 1949-05-17 American Telephone & Telegraph Multifrequency signaling system
US2508526A (en) * 1947-12-05 1950-05-23 Bell Telephone Labor Inc Telephone signal transmitter
US2658189A (en) * 1948-01-09 1953-11-03 Bell Telephone Labor Inc Signaling system based on orthogonal functions
FR997704A (en) * 1948-12-30
US2672518A (en) * 1949-05-28 1954-03-16 Bell Telephone Labor Inc Station identifier
US2779654A (en) * 1949-11-08 1957-01-29 Ferranti Ltd Graphical recording systems
US2991562A (en) * 1953-04-10 1961-07-11 Donald G C Hare Training aid system for wave detection equipment
US3076059A (en) * 1958-06-20 1963-01-29 Bell Telephone Labor Inc Signaling system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665833A (en) * 1976-11-03 1987-05-19 Fleishman Herman B Miniature electric track and train

Also Published As

Publication number Publication date
US2206538A (en) 1940-07-02

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