JPS5575354A - Communication monitor system - Google Patents

Communication monitor system

Info

Publication number
JPS5575354A
JPS5575354A JP14786578A JP14786578A JPS5575354A JP S5575354 A JPS5575354 A JP S5575354A JP 14786578 A JP14786578 A JP 14786578A JP 14786578 A JP14786578 A JP 14786578A JP S5575354 A JPS5575354 A JP S5575354A
Authority
JP
Japan
Prior art keywords
circuit
divided
transmission
signals
reception
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.)
Granted
Application number
JP14786578A
Other languages
Japanese (ja)
Other versions
JPS6229937B2 (en
Inventor
Kazuo Saito
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP14786578A priority Critical patent/JPS5575354A/en
Publication of JPS5575354A publication Critical patent/JPS5575354A/en
Publication of JPS6229937B2 publication Critical patent/JPS6229937B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To secure the monitoring for the transmission output regardless of the reception level by securing a sufficiently large amount of attenuation for the reception signals to be divided into the direction of the transmission monitor circuit via the hybird circuit and against the attenuation of the transmission signals to be divided in the same way. CONSTITUTION:The output signal of transmission circuit 1 is amplified 2 and then applied to hybrid circuit 8. The part of the output of circuit 8 is sent to transmission monitor circuit 3, and the other part is sent to hybrid circuit 5 each. Then the output signals of circuit 5 are delivered to the line via line filter 6 and insulation transformer 7. While the reception signals supplied via transformer 7 and filter 6 are divided at circuit 5 to be supplied to reception circuit 4 as well as to circuit 8. And the reception signals divided furthermore in circuit 8 are sent to amplifier 2 and circuit 3. Here a sufficiently large amount is secured for the attenuation of the reception signals to be divided into the direction of circuit 3 against the attenuation of the transmission signals to be divided in the same way. As a result, the transmission output can be monitored regardless of the reception level.
JP14786578A 1978-12-01 1978-12-01 Communication monitor system Granted JPS5575354A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14786578A JPS5575354A (en) 1978-12-01 1978-12-01 Communication monitor system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14786578A JPS5575354A (en) 1978-12-01 1978-12-01 Communication monitor system

Publications (2)

Publication Number Publication Date
JPS5575354A true JPS5575354A (en) 1980-06-06
JPS6229937B2 JPS6229937B2 (en) 1987-06-29

Family

ID=15439986

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14786578A Granted JPS5575354A (en) 1978-12-01 1978-12-01 Communication monitor system

Country Status (1)

Country Link
JP (1) JPS5575354A (en)

Also Published As

Publication number Publication date
JPS6229937B2 (en) 1987-06-29

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