JPS5560349A - Signal transmission system for power line carrier - Google Patents

Signal transmission system for power line carrier

Info

Publication number
JPS5560349A
JPS5560349A JP13342078A JP13342078A JPS5560349A JP S5560349 A JPS5560349 A JP S5560349A JP 13342078 A JP13342078 A JP 13342078A JP 13342078 A JP13342078 A JP 13342078A JP S5560349 A JPS5560349 A JP S5560349A
Authority
JP
Japan
Prior art keywords
signal
cycles
ringer
discrimination
calling
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
JP13342078A
Other languages
Japanese (ja)
Inventor
Kazuhiko Kumagai
Kenji Kobayashi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP13342078A priority Critical patent/JPS5560349A/en
Publication of JPS5560349A publication Critical patent/JPS5560349A/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
    • 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

Abstract

PURPOSE:To improve calling quality by widening a calling band by superposing a ringer signal upon pilot signal cycle used for a supervision over a reception input level and then by sending a discrimination signal when a receiver is not lifted. CONSTITUTION:A transmission band superposed upon the power line of a duplex terminal equipment at the time of the transmission of a ringer signal consists of transmission bands 21 and 24, transmitting-synchronizing pilot signal cycles 23 which are used for a reception input level supervision and sound modulation and demodulation in common with them and transmits a ringer signal for telephone calling, and discrimination signal cycles 22 and 25 for a discrimination between a reference phase and other phases. Then, phase modulation of cycle 23 is performed to make a phase difference correspond to the switching condition of a contact, the ringer signal, thereby transmitting cycles 22 and 25 at the time of a hook-down. As a result, since there is no ringer signal cycles in bands 21 and 24, a passing band is widened to improve calling quality.
JP13342078A 1978-10-30 1978-10-30 Signal transmission system for power line carrier Pending JPS5560349A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13342078A JPS5560349A (en) 1978-10-30 1978-10-30 Signal transmission system for power line carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13342078A JPS5560349A (en) 1978-10-30 1978-10-30 Signal transmission system for power line carrier

Publications (1)

Publication Number Publication Date
JPS5560349A true JPS5560349A (en) 1980-05-07

Family

ID=15104347

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13342078A Pending JPS5560349A (en) 1978-10-30 1978-10-30 Signal transmission system for power line carrier

Country Status (1)

Country Link
JP (1) JPS5560349A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010226230A (en) * 2009-03-19 2010-10-07 Toyo Networks & System Integration Co Ltd Power-line carrier communication apparatus and power-line carrier communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010226230A (en) * 2009-03-19 2010-10-07 Toyo Networks & System Integration Co Ltd Power-line carrier communication apparatus and power-line carrier communication system

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