GB1002571A - Improvements in or relating to signalling systems - Google Patents

Improvements in or relating to signalling systems

Info

Publication number
GB1002571A
GB1002571A GB44750/61A GB4475061A GB1002571A GB 1002571 A GB1002571 A GB 1002571A GB 44750/61 A GB44750/61 A GB 44750/61A GB 4475061 A GB4475061 A GB 4475061A GB 1002571 A GB1002571 A GB 1002571A
Authority
GB
United Kingdom
Prior art keywords
ringing
line
diode
source
signalling
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
GB44750/61A
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.)
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 GB1002571A publication Critical patent/GB1002571A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
GB44750/61A 1960-12-23 1961-12-14 Improvements in or relating to signalling systems Expired GB1002571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78147A US3059058A (en) 1960-12-23 1960-12-23 Subscriber line circuit with local ringing

Publications (1)

Publication Number Publication Date
GB1002571A true GB1002571A (en) 1965-08-25

Family

ID=22142214

Family Applications (1)

Application Number Title Priority Date Filing Date
GB44750/61A Expired GB1002571A (en) 1960-12-23 1961-12-14 Improvements in or relating to signalling systems

Country Status (7)

Country Link
US (1) US3059058A ( )
JP (1) JPS403575B1 ( )
BE (1) BE611694A ( )
DE (1) DE1202349B ( )
FR (1) FR1311553A ( )
GB (1) GB1002571A ( )
NL (1) NL272337A ( )

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL286845A ( ) * 1961-03-03
US3247327A (en) * 1963-01-17 1966-04-19 Northern Electric Co Telephone signalling circuits
US3235669A (en) * 1963-01-17 1966-02-15 Northern Electric Co Telephone signalling circuits
US3312787A (en) * 1963-10-17 1967-04-04 Stromberg Carlson Corp Signaling system
US3443033A (en) * 1963-10-31 1969-05-06 Bell Telephone Labor Inc Ringing arrangement for time division telephone systems
US3671678A (en) * 1970-12-22 1972-06-20 Stromberg Carlson Corp Ringing control circuit
US3978292A (en) * 1974-11-07 1976-08-31 Bell Telephone Laboratories, Incorporated Ringing control circuitry with shared ringing loop current detector
US3978293A (en) * 1974-11-07 1976-08-31 Bell Telephone Laboratories, Incorporated Ringing control circuitry with shared ringing loop current detector
FR2296324A1 (fr) * 1974-12-27 1976-07-23 Ericsson Telefon Ab L M Dispositif d'appel perfectionne pour installations de telephonie
TW201524949A (zh) 2013-11-15 2015-07-01 Invista Tech Sarl 過氧縮醛中間物之轉換

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2152475A (en) * 1938-03-29 1939-03-28 Bell Telephone Labor Inc Signaling system
BE515605A ( ) * 1952-11-18

Also Published As

Publication number Publication date
US3059058A (en) 1962-10-16
JPS403575B1 ( ) 1965-02-25
NL272337A ( )
DE1202349B (de) 1965-10-07
BE611694A (fr) 1962-04-16
FR1311553A (fr) 1962-12-07

Similar Documents

Publication Publication Date Title
EP0067268A3 (en) Hook flash actuated telephone control device
GB1002571A (en) Improvements in or relating to signalling systems
ES346305A2 (es) Una instalacion telefonica.
US3978293A (en) Ringing control circuitry with shared ringing loop current detector
GB1403668A (en) Line circuit for a key telephone system
US3508009A (en) Range extension circuit
GB1150430A (en) Device for Listening-In to Noises in a Room
US3978292A (en) Ringing control circuitry with shared ringing loop current detector
US3156775A (en) Telephone converter
CA1053782A (en) Telephone line transfer circuit
JPS5556753A (en) Emergency informing system
JPS5461806A (en) Audio response unit
GB1432666A (en) System for detecting looping of a subscribers telephone line
FR2423096A1 (fr) Agencement de sonnerie pour joncteur de central telephonique a unite de commande centralisee
US2981802A (en) Remote line concentrator
GB1389017A (en) Apparatus for conversion of telephones connection in parallel to a common line to provide a private switching system
SU1158016A1 (ru) Устройство приема сигнала ответа абонента
JPS6417549A (en) Network control unit
US3089001A (en) Telephone ringing circuit
GB1157092A (en) Telephone Answering and Recording Devices
GB1411075A (en) Telephone systems
GB1535650A (en) Electronic switching device for producing a timed signal
JPS5752257A (en) Calling control system
GB921331A (en) Improvements in telephone systems
JPS56115067A (en) Channel continuity test system