ZA734626B - Improvements in and relating to telephones - Google Patents

Improvements in and relating to telephones

Info

Publication number
ZA734626B
ZA734626B ZA734626A ZA734626A ZA734626B ZA 734626 B ZA734626 B ZA 734626B ZA 734626 A ZA734626 A ZA 734626A ZA 734626 A ZA734626 A ZA 734626A ZA 734626 B ZA734626 B ZA 734626B
Authority
ZA
South Africa
Prior art keywords
telephones
relating
Prior art date
Application number
ZA734626A
Other languages
English (en)
Inventor
J Griffiths
Original Assignee
Post Office
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 Post Office filed Critical Post Office
Publication of ZA734626B publication Critical patent/ZA734626B/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/066—Telephone sets adapted for data transmision

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Telephonic Communication Services (AREA)
ZA734626A 1972-07-21 1973-07-10 Improvements in and relating to telephones ZA734626B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3420172A GB1392747A (en) 1972-07-21 1972-07-21 Data transmission telephones

Publications (1)

Publication Number Publication Date
ZA734626B true ZA734626B (en) 1974-06-26

Family

ID=10362646

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA734626A ZA734626B (en) 1972-07-21 1973-07-10 Improvements in and relating to telephones

Country Status (7)

Country Link
AU (1) AU5791273A (US08066781-20111129-C00013.png)
BE (1) BE802572A (US08066781-20111129-C00013.png)
DE (1) DE2337119C3 (US08066781-20111129-C00013.png)
FR (1) FR2194093B1 (US08066781-20111129-C00013.png)
GB (1) GB1392747A (US08066781-20111129-C00013.png)
NL (1) NL7309979A (US08066781-20111129-C00013.png)
ZA (1) ZA734626B (US08066781-20111129-C00013.png)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2208057A (en) * 1987-07-27 1989-02-15 Barron Mccann Limited Telephone interface device

Also Published As

Publication number Publication date
NL7309979A (US08066781-20111129-C00013.png) 1974-01-23
FR2194093A1 (US08066781-20111129-C00013.png) 1974-02-22
AU5791273A (en) 1975-01-16
GB1392747A (en) 1975-04-30
FR2194093B1 (US08066781-20111129-C00013.png) 1977-02-18
DE2337119B2 (de) 1974-10-24
BE802572A (fr) 1973-11-16
DE2337119A1 (de) 1974-02-07
DE2337119C3 (de) 1975-06-05

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