GB984580A - Improvements in or relating to circuit arrangements for automatic telephone systems - Google Patents

Improvements in or relating to circuit arrangements for automatic telephone systems

Info

Publication number
GB984580A
GB984580A GB3483762A GB3483762A GB984580A GB 984580 A GB984580 A GB 984580A GB 3483762 A GB3483762 A GB 3483762A GB 3483762 A GB3483762 A GB 3483762A GB 984580 A GB984580 A GB 984580A
Authority
GB
United Kingdom
Prior art keywords
signal
circuit
keysender
relay
winding
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
GB3483762A
Other languages
English (en)
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 Electronics UK Ltd
Original Assignee
Philips Electronic and Associated 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 Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB984580A publication Critical patent/GB984580A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB3483762A 1961-09-15 1962-09-12 Improvements in or relating to circuit arrangements for automatic telephone systems Expired GB984580A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL269292 1961-09-15

Publications (1)

Publication Number Publication Date
GB984580A true GB984580A (en) 1965-02-24

Family

ID=19753285

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3483762A Expired GB984580A (en) 1961-09-15 1962-09-12 Improvements in or relating to circuit arrangements for automatic telephone systems

Country Status (5)

Country Link
BE (1) BE622438A (forum.php)
CH (1) CH395205A (forum.php)
DE (1) DE1159041B (forum.php)
GB (1) GB984580A (forum.php)
NL (1) NL269292A (forum.php)

Also Published As

Publication number Publication date
NL269292A (forum.php)
BE622438A (forum.php)
CH395205A (de) 1965-07-15
DE1159041B (de) 1963-12-12

Similar Documents

Publication Publication Date Title
GB1280388A (en) Telephone instrument
ES441187A1 (es) Perfeccionamientos en receptores para sistemas telefonicos moviles.
CA1049671A (en) Key telephone system intercom arrangement
GB1185678A (en) A Telephone System
GB1065540A (en) Circuit arrangement for dial pulse receiving facilities in a telephone exchange system
GB646288A (en) Improvements in automatic telephone systems
US2041964A (en) Telephone system
GB984580A (en) Improvements in or relating to circuit arrangements for automatic telephone systems
GB1085938A (en) Voice-frequency key dialling telephone system
JPS57206156A (en) Calling system for information of calling subscriber
GB834204A (en) Improvements in or relating to circuit arrangements for automatic telephone exchanges
GB971802A (en) Signalling system for substation apparatus
GB997229A (en) In-dialling circuit for a private branch exchange
GB1043839A (en) Method to mark calls in telephone connections, equipped with automatic call transfer
US3091666A (en) Party identification for telephone substations
GB1084099A (forum.php)
GB1041329A (en) An intrinsic safety telephone device
GB954211A (en) Circuit arrangement for subscribers' stations
GB1051505A (forum.php)
GB1061162A (en) Improvements in or relating to p.a.b.x. telephone systems
GB1077478A (en) Improvements in or relating to telecommunications systems subscriber's sets
GB1007100A (en) Improvements in or relating to automatic telephone systems
GB1012053A (en) Improvements in or relating to telephone intercepting trunk circuits
GB1307266A (en) Automatic telephone systems
GB910967A (en) Improvements in or relating to automatic telephone exchanges