JPS57147341A - Measurement system for transmission characteristics - Google Patents

Measurement system for transmission characteristics

Info

Publication number
JPS57147341A
JPS57147341A JP3292381A JP3292381A JPS57147341A JP S57147341 A JPS57147341 A JP S57147341A JP 3292381 A JP3292381 A JP 3292381A JP 3292381 A JP3292381 A JP 3292381A JP S57147341 A JPS57147341 A JP S57147341A
Authority
JP
Japan
Prior art keywords
measurement signal
measuring instrument
level
measurement
noise level
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
JP3292381A
Other languages
Japanese (ja)
Other versions
JPS6237579B2 (en
Inventor
Shoichi Zensai
Fumihiko Deguchi
Takashi Yamamoto
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.)
Anritsu Corp
Nippon Telegraph and Telephone Corp
Original Assignee
Anritsu Corp
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 Anritsu Corp, Nippon Telegraph and Telephone Corp filed Critical Anritsu Corp
Priority to JP3292381A priority Critical patent/JPS57147341A/en
Publication of JPS57147341A publication Critical patent/JPS57147341A/en
Publication of JPS6237579B2 publication Critical patent/JPS6237579B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/28—Measuring attenuation, gain, phase shift or derived characteristics of electric four pole networks, i.e. two-port networks; Measuring transient response

Abstract

PURPOSE:To measure a noise level in a short time when no telephone call is made, by providing measuring devices at both terminals of a toll circuit to be measured, and performing the measurement simultaneously by said both measuring devices. CONSTITUTION:In a terminating device SM, a receiver 35 receives a forward- path measurement signal tone arriving from an originating device MM through a toll circuit to be measured, and only said measurement signal tone is selected by a BPF42 through the side (a) of a contact 39, so that level measurement is performed by a measuring instrument 34. While said measurement signal tone is not sent from the originating device MM, the conatct 39 is changed over to a side (b), and the measuring instrument 34 measures its noise level passed through a noise weighting circuit 37 when no telephone call is made. Simultaneously, in the originating device MM, a measuring instrument 14 measures the level of a backward-path measurement signal sent from the terminating device SM and its noise level during a no-call period by utilizing a no-signal period.
JP3292381A 1981-03-07 1981-03-07 Measurement system for transmission characteristics Granted JPS57147341A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3292381A JPS57147341A (en) 1981-03-07 1981-03-07 Measurement system for transmission characteristics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3292381A JPS57147341A (en) 1981-03-07 1981-03-07 Measurement system for transmission characteristics

Publications (2)

Publication Number Publication Date
JPS57147341A true JPS57147341A (en) 1982-09-11
JPS6237579B2 JPS6237579B2 (en) 1987-08-13

Family

ID=12372420

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3292381A Granted JPS57147341A (en) 1981-03-07 1981-03-07 Measurement system for transmission characteristics

Country Status (1)

Country Link
JP (1) JPS57147341A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63169376U (en) * 1987-04-27 1988-11-04

Also Published As

Publication number Publication date
JPS6237579B2 (en) 1987-08-13

Similar Documents

Publication Publication Date Title
JPS5778237A (en) Fault detection system for control channel of radio telephone set
JPS6423658A (en) Circuit and method for avoiding illegal usage of public telephone
JPS57147341A (en) Measurement system for transmission characteristics
JPS52139302A (en) Automatic circuit switching unit
JPS5378859A (en) Automatic measuring and testing system
JPS57147340A (en) Measurement system for transmission characteristics
JPS5548678A (en) Automatic time correction device
JPS57147339A (en) Measurement system for transmission characteristics
JPS5485616A (en) Automatic circuit test system
JPS5451702A (en) Automatic power supply cut-off circuit
JPS5245804A (en) Telephone memo recording method
JPS57103467A (en) Public terminal communication system
JPS57145466A (en) Switchboard
JPS54162905A (en) Radiotelephony equipment
JPS6416169A (en) Telephone set with call charge display function
JPS52106608A (en) Measuring method of dial tone delay
JPS53140903A (en) Recording unit of call
JPS5210780A (en) Current volume measuring device
JPS5799858A (en) Public terminal communication system
JPS55161458A (en) Fault discriminating system in facsimile communication system
JPS5591288A (en) Time-division channel connection test system
JPS57156566A (en) Detector for quantity of electricity
JPS6444146A (en) Data circuit test system
JPS5710569A (en) Pseudo call tester
JPS55104144A (en) Level check system of test signal delivery