JPS55125735A - Data trasmission system using power line - Google Patents

Data trasmission system using power line

Info

Publication number
JPS55125735A
JPS55125735A JP3350979A JP3350979A JPS55125735A JP S55125735 A JPS55125735 A JP S55125735A JP 3350979 A JP3350979 A JP 3350979A JP 3350979 A JP3350979 A JP 3350979A JP S55125735 A JPS55125735 A JP S55125735A
Authority
JP
Japan
Prior art keywords
power line
data
power
circuit
unbalance
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.)
Pending
Application number
JP3350979A
Other languages
Japanese (ja)
Inventor
Tetsuo Ueno
Shigeo Obara
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.)
Meisei Electric Co Ltd
Original Assignee
Meisei Electric Co 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 Meisei Electric Co Ltd filed Critical Meisei Electric Co Ltd
Priority to JP3350979A priority Critical patent/JPS55125735A/en
Publication of JPS55125735A publication Critical patent/JPS55125735A/en
Pending 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
    • H04B3/542—Systems for transmission via power distribution lines the information being in digital form
    • 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
    • H04B2203/5458—Monitor sensor; Alarm systems

Abstract

PURPOSE:To always monitor the power line and to enable the transmission of data without hindrance, by performing the power line for the data transmission with balanced transmission line and providing the unbalance of power line. CONSTITUTION:When the bridge circuit 50 is balanced, the voltage EAC between the power lines L1, L2 and the noise superimposed on the lines L1 and L2 are not appeared between the points A and B, accordingly EAC is not delivered to RX via the transformer T2 at the reception station RX side and the unbalance detection circuit CON is inoperative. Next, the impedance Cx is produced between L2 and ground near RX due to time aging of power line, then the balance of L1, L2 is unbalanced, the power component is inputted together with the data signal at RX side (the data signal in this case is masked and not dlivered normally), that is, a potential difference is caused between the points (A) and (B), the current due to power flows between the (C) and (D) of the primary side of T2, this unbalanced voltage is detected CON as unbalance signal at L1, L2 unbalancing, this is fed to the switch circuit A.SW and alarm circuit ARL to monitor the power line and interruption of data circuit.
JP3350979A 1979-03-22 1979-03-22 Data trasmission system using power line Pending JPS55125735A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3350979A JPS55125735A (en) 1979-03-22 1979-03-22 Data trasmission system using power line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3350979A JPS55125735A (en) 1979-03-22 1979-03-22 Data trasmission system using power line

Publications (1)

Publication Number Publication Date
JPS55125735A true JPS55125735A (en) 1980-09-27

Family

ID=12388505

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3350979A Pending JPS55125735A (en) 1979-03-22 1979-03-22 Data trasmission system using power line

Country Status (1)

Country Link
JP (1) JPS55125735A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006014294A (en) * 2004-05-27 2006-01-12 Matsushita Electric Ind Co Ltd Communication equipment, communication system, and communication method
JP2006279270A (en) * 2005-03-28 2006-10-12 Matsushita Electric Ind Co Ltd Apparatus for detecting line state, communication apparatus, balanced transmission system, and method of detecting line state

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006014294A (en) * 2004-05-27 2006-01-12 Matsushita Electric Ind Co Ltd Communication equipment, communication system, and communication method
JP2006279270A (en) * 2005-03-28 2006-10-12 Matsushita Electric Ind Co Ltd Apparatus for detecting line state, communication apparatus, balanced transmission system, and method of detecting line state

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