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JPS6432539A - Private line test system - Google Patents

Private line test system

Info

Publication number
JPS6432539A
JPS6432539A JP18912887A JP18912887A JPS6432539A JP S6432539 A JPS6432539 A JP S6432539A JP 18912887 A JP18912887 A JP 18912887A JP 18912887 A JP18912887 A JP 18912887A JP S6432539 A JPS6432539 A JP S6432539A
Authority
JP
Japan
Prior art keywords
frequency
incoming
level
result
output
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
JP18912887A
Other languages
Japanese (ja)
Inventor
Takeo Anzai
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
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 filed Critical NEC Corp
Priority to JP18912887A priority Critical patent/JPS6432539A/en
Publication of JPS6432539A publication Critical patent/JPS6432539A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE:To obtain characteristics of incoming/outgoing lines individually by only operating one terminal station by providing a means for applying frequency conversion to a level on a loopback connecting point of both the incoming and outgoing lines. CONSTITUTION:Switches SW1, SW2 are turned on by a control signal generated at the near end at the time of testing lines W1, W2 and the oscillated frequency and the output level of the oscillator 1 are set to a desired value. The output of the oscillator is inputted to a remote end conversion circuit 2 via the line W1, rectified and smoothed (21), the carrier frequency signal having a prescribed level and frequency is subjected to frequency modulation by a smoothed output and the result is sent to the line W2. A measuring circuit 3 receiving the frequency modulation signal applies frequency demodulation to the reception signal or leaves the reception signal as it is in response to the switching of the SW3 to supply the result to a level meter 32. As a result, the transmission characteristics of the incoming/outgoing lines is measured individually by the near end operation only.
JP18912887A 1987-07-28 1987-07-28 Private line test system Pending JPS6432539A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18912887A JPS6432539A (en) 1987-07-28 1987-07-28 Private line test system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18912887A JPS6432539A (en) 1987-07-28 1987-07-28 Private line test system

Publications (1)

Publication Number Publication Date
JPS6432539A true JPS6432539A (en) 1989-02-02

Family

ID=16235865

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18912887A Pending JPS6432539A (en) 1987-07-28 1987-07-28 Private line test system

Country Status (1)

Country Link
JP (1) JPS6432539A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5395859A (en) * 1991-06-21 1995-03-07 Alliedsignal Inc. Catalysts which stabilize hydrohalocarbon blowing agent in polyisocyanurate foam formulations during polymerization

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5395859A (en) * 1991-06-21 1995-03-07 Alliedsignal Inc. Catalysts which stabilize hydrohalocarbon blowing agent in polyisocyanurate foam formulations during polymerization
US5561171A (en) * 1991-06-21 1996-10-01 Alliedsignal, Inc. Catalysts which stabilize hydrohalocarbon blowing agent in polyisocyanurate foam formulations during polymerization

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