CA1216689A - Systeme de lignes telephoniques supplementaires utilisant les lignes de secteur, avec transmission de signaux codes entre les postes telephoniques, tele- conferences en duplex, garde d'appels, lignes supplementaires multi-telephones et interphone - Google Patents

Systeme de lignes telephoniques supplementaires utilisant les lignes de secteur, avec transmission de signaux codes entre les postes telephoniques, tele- conferences en duplex, garde d'appels, lignes supplementaires multi-telephones et interphone

Info

Publication number
CA1216689A
CA1216689A CA000437936A CA437936A CA1216689A CA 1216689 A CA1216689 A CA 1216689A CA 000437936 A CA000437936 A CA 000437936A CA 437936 A CA437936 A CA 437936A CA 1216689 A CA1216689 A CA 1216689A
Authority
CA
Canada
Prior art keywords
telephone
station
line
signal
signals
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
CA000437936A
Other languages
English (en)
Inventor
William M. Brown
James R. Lindquist
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.)
Astech Inc
Original Assignee
Astech 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
Priority claimed from US06/430,762 external-priority patent/US4514594A/en
Priority claimed from US06/432,400 external-priority patent/US4562884A/en
Priority claimed from US06/445,499 external-priority patent/US4523307A/en
Application filed by Astech Inc filed Critical Astech Inc
Application granted granted Critical
Publication of CA1216689A publication Critical patent/CA1216689A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H04B3/544—Setting up communications; Call and signalling arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/71—Substation extension arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5437—Wired telephone

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
CA000437936A 1982-09-30 1983-09-29 Systeme de lignes telephoniques supplementaires utilisant les lignes de secteur, avec transmission de signaux codes entre les postes telephoniques, tele- conferences en duplex, garde d'appels, lignes supplementaires multi-telephones et interphone Expired CA1216689A (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US43085182A 1982-09-30 1982-09-30
US06/430,762 US4514594A (en) 1982-09-30 1982-09-30 Power line carrier telephone extension system for full duplex conferencing between telephones and having telephone call hold capability
US06/432,400 US4562884A (en) 1981-11-25 1982-09-30 Heat-exchanger arrangement
US430,762 1982-09-30
US430,851 1982-09-30
US06/445,499 US4523307A (en) 1982-11-30 1982-11-30 Power line carrier multi telephone extension system for full duplex conferencing and intercom between telephones
US445,499 1982-11-30
US432,400 1989-11-06

Publications (1)

Publication Number Publication Date
CA1216689A true CA1216689A (fr) 1987-01-13

Family

ID=27503791

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000437936A Expired CA1216689A (fr) 1982-09-30 1983-09-29 Systeme de lignes telephoniques supplementaires utilisant les lignes de secteur, avec transmission de signaux codes entre les postes telephoniques, tele- conferences en duplex, garde d'appels, lignes supplementaires multi-telephones et interphone

Country Status (2)

Country Link
KR (1) KR920002802B1 (fr)
CA (1) CA1216689A (fr)

Also Published As

Publication number Publication date
KR920002802B1 (ko) 1992-04-03
KR840006274A (ko) 1984-11-22

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Legal Events

Date Code Title Description
MKEX Expiry