CH423889A - Circuit arrangement for telephone stations with control keypad - Google Patents

Circuit arrangement for telephone stations with control keypad

Info

Publication number
CH423889A
CH423889A CH1174164A CH1174164A CH423889A CH 423889 A CH423889 A CH 423889A CH 1174164 A CH1174164 A CH 1174164A CH 1174164 A CH1174164 A CH 1174164A CH 423889 A CH423889 A CH 423889A
Authority
CH
Switzerland
Prior art keywords
circuit arrangement
telephone stations
control keypad
keypad
control
Prior art date
Application number
CH1174164A
Other languages
German (de)
Inventor
Werner Dipl Ing Quirein
Thies Paul-Hans
Original Assignee
Siemens Ag
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 Siemens Ag filed Critical Siemens Ag
Publication of CH423889A publication Critical patent/CH423889A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Push-Button Switches (AREA)
CH1174164A 1963-09-11 1964-09-09 Circuit arrangement for telephone stations with control keypad CH423889A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES87233A DE1179264B (en) 1963-09-11 1963-09-11 Circuit arrangement for telephone stations with control keyboard

Publications (1)

Publication Number Publication Date
CH423889A true CH423889A (en) 1966-11-15

Family

ID=7513609

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1174164A CH423889A (en) 1963-09-11 1964-09-09 Circuit arrangement for telephone stations with control keypad

Country Status (6)

Country Link
BE (1) BE652976A (en)
CH (1) CH423889A (en)
DE (1) DE1179264B (en)
GB (1) GB1030074A (en)
NL (1) NL145737B (en)
SE (1) SE368894B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107800419A (en) * 2016-09-07 2018-03-13 宏百贸易有限公司 A kind of button, electronic circuit, keyboard

Also Published As

Publication number Publication date
SE368894B (en) 1974-07-22
NL6410546A (en) 1965-03-12
DE1179264B (en) 1964-10-08
NL145737B (en) 1975-04-15
GB1030074A (en) 1966-05-18
BE652976A (en) 1965-03-11

Similar Documents

Publication Publication Date Title
NL147000B (en) TELEPHONE SWITCHING SYSTEM WITH TIME DIVIDING.
CH403876A (en) Circuit arrangement for time division multiplex telephone switching systems
CH407245A (en) Circuit arrangement for telecommunication systems, in particular with control devices constructed like a cross field
CH417696A (en) Telephone line system with tone-frequency push-button selection
NL142556B (en) TELEPHONE SWITCHING SYSTEM WITH PBX CENTRALS.
CH423889A (en) Circuit arrangement for telephone stations with control keypad
CH413923A (en) Circuit arrangement for telecommunication switching systems, in particular telephone switching systems
FR1415042A (en) Telephone line circuit
CH394311A (en) Circuit arrangement for time division multiplex telephone switching systems
AT244397B (en) Circuit arrangement for pay phone
CH422903A (en) Circuit arrangement for a telephone system with keypad selection
CH441446A (en) Circuit arrangement for telecommunications, in particular telephone extension systems with dialing stations with earth buttons
AT277328B (en) Circuit arrangement for telephone switching systems
CH409025A (en) Hybrid circuit for communication systems
AT243332B (en) Circuit arrangement for pay phone
AT246233B (en) Circuit arrangement for telecommunications, in particular telephone systems
AT266930B (en) Circuit arrangement for telephone switching systems
AT254285B (en) Circuit arrangement for telecommunication, in particular telephone systems with direct current supply of the subscriber stations
AT251663B (en) Circuit arrangement for a telephone subscriber station
NL146677B (en) TELEPHONE SET WITH AN ELASTICALLY SUPPORTED DIAL.
CH429836A (en) Circuit arrangement for telephone subscriber stations with a transistor amplifier
CH454231A (en) Circuit arrangement for subscriber circuits in telecommunications systems
CH423893A (en) Circuit arrangement for telecommunication switching systems with markings, in particular telephone switching systems
CH408108A (en) Circuit arrangement for telex subscriber stations
CH452936A (en) Retransmission device for computing office machines with numeric keypad