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JPS5482909A - Operation monitor system for echo blocking system - Google Patents

Operation monitor system for echo blocking system

Info

Publication number
JPS5482909A
JPS5482909A JP15088277A JP15088277A JPS5482909A JP S5482909 A JPS5482909 A JP S5482909A JP 15088277 A JP15088277 A JP 15088277A JP 15088277 A JP15088277 A JP 15088277A JP S5482909 A JPS5482909 A JP S5482909A
Authority
JP
Japan
Prior art keywords
monitor
circuit
signal
control circuit
control
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
JP15088277A
Other languages
Japanese (ja)
Inventor
Yoshiaki Matsumoto
Eijiro Hishida
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
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone 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 Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15088277A priority Critical patent/JPS5482909A/en
Publication of JPS5482909A publication Critical patent/JPS5482909A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

PURPOSE:To enable normal monitor for the operation of the control circuit shown in solid lines, by comparing and judging the monitor signal during monitor time slot and the corresponding output from the control circuit. CONSTITUTION:The PAM signal from the delivery circuits 101 to 10n is multiplexed in time sharing on the bus 400, and the monitor signal amplitude-modulated is outputted from the monitor signal transmission circuit 301 so that it moves in the operation region of the echo blocking unit according to specific sequence, and it is PAM- modulated with the sampling circuit 311 and multiplexed in time sharing for one channel's share or a plurality of channel's share of the delivery circuits 101 to 10n and is fed to the control circuit 200. When the echo blocking unit is normal, the control signal from the control circuit 200 is fed to the delivery circuits 101 to 10n and the monitor circuit 300, where the control signal corresponding to the monitor signal from the circuit 301 is received with the reception circuit 302. The propriety is compared and judged, alarm is made at failure and the line can be assured.
JP15088277A 1977-12-14 1977-12-14 Operation monitor system for echo blocking system Pending JPS5482909A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15088277A JPS5482909A (en) 1977-12-14 1977-12-14 Operation monitor system for echo blocking system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15088277A JPS5482909A (en) 1977-12-14 1977-12-14 Operation monitor system for echo blocking system

Publications (1)

Publication Number Publication Date
JPS5482909A true JPS5482909A (en) 1979-07-02

Family

ID=15506435

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15088277A Pending JPS5482909A (en) 1977-12-14 1977-12-14 Operation monitor system for echo blocking system

Country Status (1)

Country Link
JP (1) JPS5482909A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50131411A (en) * 1974-04-03 1975-10-17

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50131411A (en) * 1974-04-03 1975-10-17

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