JPS56109053A - Monitor system of distortion folding for bidirectional relay transmission line - Google Patents

Monitor system of distortion folding for bidirectional relay transmission line

Info

Publication number
JPS56109053A
JPS56109053A JP1222780A JP1222780A JPS56109053A JP S56109053 A JPS56109053 A JP S56109053A JP 1222780 A JP1222780 A JP 1222780A JP 1222780 A JP1222780 A JP 1222780A JP S56109053 A JPS56109053 A JP S56109053A
Authority
JP
Japan
Prior art keywords
group delay
distortion
signal
group
band
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
JP1222780A
Other languages
Japanese (ja)
Other versions
JPS5945308B2 (en
Inventor
Nobuyuki Tokura
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP55012227A priority Critical patent/JPS5945308B2/en
Publication of JPS56109053A publication Critical patent/JPS56109053A/en
Publication of JPS5945308B2 publication Critical patent/JPS5945308B2/en
Expired 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
    • H04B3/462—Testing group delay or phase shift, e.g. timing jitter

Landscapes

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

Abstract

PURPOSE:To enable to separate distortion from each relay device, by seleting the group delay measuring frequency band in group bidirectional relay transmission line so that the group delay distortion caused in the transmission side relay transmission line can be compensated at the reception side relay transmission line. CONSTITUTION:In case of low group transmission and high group reception with a group bidirectional relay device, the continuous transmission signal F for group delay distortion measurement and the frequency band of intermittent transmission signal F1 are selected as shown in figure. In the transmission line group delay characteristic curves 17, 18 at one relay section, taking the group delay in occupied band of the signal F1 as D, and the group delay in the occupied band of the distortion folding reception signal F2 as D2, and the frequency conversion of the group delay D of signal F1 band into the signal F2 band as D1, the frequency band of signals F1, F2 is selected so that the sum of the group delay D1, D2 can almost be constant within the occupied band of the signal F2. The slope of D1 and D2 to the frequency of group delay is inversed, and distortion folding in one relay section is cancelled for the group delay distortion in the transmission and reception side lines to avoid group delay distortion and to separate the distortion from each relay device.
JP55012227A 1980-02-04 1980-02-04 Distortion loop monitoring method for bidirectional relay transmission line Expired JPS5945308B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55012227A JPS5945308B2 (en) 1980-02-04 1980-02-04 Distortion loop monitoring method for bidirectional relay transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55012227A JPS5945308B2 (en) 1980-02-04 1980-02-04 Distortion loop monitoring method for bidirectional relay transmission line

Publications (2)

Publication Number Publication Date
JPS56109053A true JPS56109053A (en) 1981-08-29
JPS5945308B2 JPS5945308B2 (en) 1984-11-05

Family

ID=11799482

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55012227A Expired JPS5945308B2 (en) 1980-02-04 1980-02-04 Distortion loop monitoring method for bidirectional relay transmission line

Country Status (1)

Country Link
JP (1) JPS5945308B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62270807A (en) * 1986-05-19 1987-11-25 阿波野　政晴 Crossed pipe fitting

Also Published As

Publication number Publication date
JPS5945308B2 (en) 1984-11-05

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