GB838783A - Improvements in or relating to monitoring arrangements - Google Patents

Improvements in or relating to monitoring arrangements

Info

Publication number
GB838783A
GB838783A GB209056A GB209056A GB838783A GB 838783 A GB838783 A GB 838783A GB 209056 A GB209056 A GB 209056A GB 209056 A GB209056 A GB 209056A GB 838783 A GB838783 A GB 838783A
Authority
GB
United Kingdom
Prior art keywords
thermistors
thermistor
meter
line
resistance
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.)
Expired
Application number
GB209056A
Inventor
Reginald Charles Bolt
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and 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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB209056A priority Critical patent/GB838783A/en
Publication of GB838783A publication Critical patent/GB838783A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

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

838,783. Telephone transmission systems. AUTOMATIC TELEPHONE & ELECTRIC CO. Ltd. Dec. 20, 1956 [Jan. 21, 1956], No. 2090/56. Class 40 (4). [Also in Group XXXVI] In a transmission system in which a pilot tone is used to control the heating of thermistors in an attenuation correction network, a resistance measuring circuit including a meter is connected across the thermistor to afford permanent monitoring of the condition of the line. As shown, Fig. 1, a variable attenuation network in the transmission line TL comprises a series resistor R2 and two shunt thermistors TH1, 2 heated by rectified pilot current filtered from the transmission line by means not shown. The resistance of the thermistors is measured by a meter Ml (which may be calibrated in decibels) in series with a battery B and the thermistors, chokes L1, L2 preventing the shunting of the A.C. signals on the line. In a further embodiment, Fig. 2 (not shown) a meter measures the resistance of a thermistor controlled by a current derived from two pilot currents, the thermistor controlling the slope of the attenuation-frequency characteristic of a variable equalizer.
GB209056A 1956-01-21 1956-01-21 Improvements in or relating to monitoring arrangements Expired GB838783A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB209056A GB838783A (en) 1956-01-21 1956-01-21 Improvements in or relating to monitoring arrangements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB209056A GB838783A (en) 1956-01-21 1956-01-21 Improvements in or relating to monitoring arrangements

Publications (1)

Publication Number Publication Date
GB838783A true GB838783A (en) 1960-06-22

Family

ID=9733414

Family Applications (1)

Application Number Title Priority Date Filing Date
GB209056A Expired GB838783A (en) 1956-01-21 1956-01-21 Improvements in or relating to monitoring arrangements

Country Status (1)

Country Link
GB (1) GB838783A (en)

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