IE37172B1 - Improvements relating to push-button signalling systems for telephone instruments - Google Patents

Improvements relating to push-button signalling systems for telephone instruments

Info

Publication number
IE37172B1
IE37172B1 IE160/73A IE16073A IE37172B1 IE 37172 B1 IE37172 B1 IE 37172B1 IE 160/73 A IE160/73 A IE 160/73A IE 16073 A IE16073 A IE 16073A IE 37172 B1 IE37172 B1 IE 37172B1
Authority
IE
Ireland
Prior art keywords
contacts
operated
strobe signal
common
push
Prior art date
Application number
IE160/73A
Other languages
English (en)
Other versions
IE37172L (en
Original Assignee
Standard Telephones Cables 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 Standard Telephones Cables Ltd filed Critical Standard Telephones Cables Ltd
Publication of IE37172L publication Critical patent/IE37172L/xx
Publication of IE37172B1 publication Critical patent/IE37172B1/xx

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
    • H04M1/515—Devices for calling a subscriber by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of DC signals of alternating polarity, coded pulses or impedance dialling

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Push-Button Switches (AREA)
  • Telephone Set Structure (AREA)
IE160/73A 1972-03-16 1973-01-31 Improvements relating to push-button signalling systems for telephone instruments IE37172B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1235472A GB1370221A (en) 1972-03-16 1972-03-16 Push button signalling systems for telephone instruments

Publications (2)

Publication Number Publication Date
IE37172L IE37172L (en) 1973-09-16
IE37172B1 true IE37172B1 (en) 1977-05-25

Family

ID=10002987

Family Applications (1)

Application Number Title Priority Date Filing Date
IE160/73A IE37172B1 (en) 1972-03-16 1973-01-31 Improvements relating to push-button signalling systems for telephone instruments

Country Status (6)

Country Link
DE (1) DE2312454A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ES (1) ES412669A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2176144A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1370221A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
IE (1) IE37172B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ZA (1) ZA73298B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Also Published As

Publication number Publication date
ZA73298B (en) 1973-11-28
FR2176144A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-10-26
ES412669A1 (es) 1976-01-01
GB1370221A (en) 1974-10-16
DE2312454A1 (de) 1973-09-20
IE37172L (en) 1973-09-16
AU5333273A (en) 1974-09-19

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