ZA735121B - Keysending signalling systems - Google Patents

Keysending signalling systems

Info

Publication number
ZA735121B
ZA735121B ZA735121A ZA735121A ZA735121B ZA 735121 B ZA735121 B ZA 735121B ZA 735121 A ZA735121 A ZA 735121A ZA 735121 A ZA735121 A ZA 735121A ZA 735121 B ZA735121 B ZA 735121B
Authority
ZA
South Africa
Prior art keywords
keysending
signalling systems
signalling
systems
keysending signalling
Prior art date
Application number
ZA735121A
Inventor
N Williams
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 ZA735121B publication Critical patent/ZA735121B/en

Links

Classifications

    • 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
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency
    • 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)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
ZA735121A 1972-08-03 1973-07-26 Keysending signalling systems ZA735121B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3623072A GB1361937A (en) 1972-08-03 1972-08-03 Keysending signalling systems

Publications (1)

Publication Number Publication Date
ZA735121B true ZA735121B (en) 1974-06-26

Family

ID=10386183

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA735121A ZA735121B (en) 1972-08-03 1973-07-26 Keysending signalling systems

Country Status (2)

Country Link
GB (1) GB1361937A (en)
ZA (1) ZA735121B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3064363D1 (en) * 1979-05-07 1983-09-01 Autophon Ag Installation for wireless transmission of telephonic communications with a number of radio channels inferior to the number of subscriber stations

Also Published As

Publication number Publication date
GB1361937A (en) 1974-07-30

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