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ES415180A1 - Transmission systems - Google Patents

Transmission systems

Info

Publication number
ES415180A1
ES415180A1 ES415180A ES415180A ES415180A1 ES 415180 A1 ES415180 A1 ES 415180A1 ES 415180 A ES415180 A ES 415180A ES 415180 A ES415180 A ES 415180A ES 415180 A1 ES415180 A1 ES 415180A1
Authority
ES
Spain
Prior art keywords
pilot signal
control circuit
generator
arrival
locally generated
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
ES415180A
Other languages
Spanish (es)
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES415180A1 publication Critical patent/ES415180A1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/40—Monitoring; Testing of relay systems
    • H04B17/401—Monitoring; Testing of relay systems with selective localization
    • H04B17/402—Monitoring; Testing of relay systems with selective localization using different frequencies
    • H04B17/403—Monitoring; Testing of relay systems with selective localization using different frequencies generated by local oscillators

Landscapes

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

Abstract

A device for controlling transmission systems under fault conditions and, specifically, a repeater dependent on or for a transmission system comprising a pilot signal generator and a control circuit for controlling an input pilot signal. The control circuit responds to a change in said arrival signal to a value outside a predetermined range, so that the generator automatically provides a locally generated pilot signal to the transmission line. The control circuit responds by receiving a restored arrival pilot signal by disconnecting the locally generated pilot signal from the line. Interference from the control operation of the control circuit by the local generator is prevented by time discrimination. (Machine-translation by Google Translate, not legally binding)
ES415180A 1972-05-25 1973-05-25 Transmission systems Expired ES415180A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2469072A GB1381554A (en) 1972-05-25 1972-05-25 Transmission systems

Publications (1)

Publication Number Publication Date
ES415180A1 true ES415180A1 (en) 1976-02-01

Family

ID=10215740

Family Applications (1)

Application Number Title Priority Date Filing Date
ES415180A Expired ES415180A1 (en) 1972-05-25 1973-05-25 Transmission systems

Country Status (4)

Country Link
ES (1) ES415180A1 (en)
FR (1) FR2185902B1 (en)
GB (1) GB1381554A (en)
ZA (1) ZA732618B (en)

Also Published As

Publication number Publication date
AU5530673A (en) 1974-11-07
ZA732618B (en) 1974-04-24
FR2185902B1 (en) 1978-01-06
FR2185902A1 (en) 1974-01-04
GB1381554A (en) 1975-01-22

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