GB1423668A - Dialling signal transmission system - Google Patents

Dialling signal transmission system

Info

Publication number
GB1423668A
GB1423668A GB4425273A GB4425273A GB1423668A GB 1423668 A GB1423668 A GB 1423668A GB 4425273 A GB4425273 A GB 4425273A GB 4425273 A GB4425273 A GB 4425273A GB 1423668 A GB1423668 A GB 1423668A
Authority
GB
United Kingdom
Prior art keywords
line
key
receiver
voltage level
voltage levels
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
GB4425273A
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.)
Alcatel CIT SA
Nokia Inc
Original Assignee
Compagnie Industrielle de Telecommunication CIT Alcatel SA
Nokia 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 Compagnie Industrielle de Telecommunication CIT Alcatel SA, Nokia Inc filed Critical Compagnie Industrielle de Telecommunication CIT Alcatel SA
Publication of GB1423668A publication Critical patent/GB1423668A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
    • 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
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Telephone Set Structure (AREA)
GB4425273A 1972-09-21 1973-09-20 Dialling signal transmission system Expired GB1423668A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7233529A FR2199921A5 (enExample) 1972-09-21 1972-09-21

Publications (1)

Publication Number Publication Date
GB1423668A true GB1423668A (en) 1976-02-04

Family

ID=9104608

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4425273A Expired GB1423668A (en) 1972-09-21 1973-09-20 Dialling signal transmission system

Country Status (7)

Country Link
BE (1) BE804753A (enExample)
CH (1) CH578809A5 (enExample)
DE (1) DE2345757A1 (enExample)
FR (1) FR2199921A5 (enExample)
GB (1) GB1423668A (enExample)
IT (1) IT993358B (enExample)
NL (1) NL7313088A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192742A (en) * 1986-06-11 1988-01-20 Salplex Ltd Information handling and control systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3036801C2 (de) * 1980-09-30 1982-08-26 Ritto-Werk Loh GmbH & Co KG, 6348 Herborn Schaltungsanordnung zur Übertragung von Gleichstrom-Kennzeichen über eine zweiradrige Leitung von einer Sendestelle zu einer Empfangsstelle, insbesondere von einer Sprechstelle zu der Zentrale einer Sprechanlage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2192742A (en) * 1986-06-11 1988-01-20 Salplex Ltd Information handling and control systems

Also Published As

Publication number Publication date
FR2199921A5 (enExample) 1974-04-12
NL7313088A (enExample) 1974-03-25
IT993358B (it) 1975-09-30
CH578809A5 (enExample) 1976-08-13
BE804753A (fr) 1974-03-12
DE2345757A1 (de) 1974-03-28

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee