GB786079A - Improvements in or relating to monitoring devices used in carrier-wave telephone systems - Google Patents

Improvements in or relating to monitoring devices used in carrier-wave telephone systems

Info

Publication number
GB786079A
GB786079A GB3400/55A GB340055A GB786079A GB 786079 A GB786079 A GB 786079A GB 3400/55 A GB3400/55 A GB 3400/55A GB 340055 A GB340055 A GB 340055A GB 786079 A GB786079 A GB 786079A
Authority
GB
United Kingdom
Prior art keywords
change
relay
frequency
indicators
feb
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
GB3400/55A
Other languages
English (en)
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB786079A publication Critical patent/GB786079A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/16—Monitoring arrangements
    • 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

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
GB3400/55A 1954-02-09 1955-02-04 Improvements in or relating to monitoring devices used in carrier-wave telephone systems Expired GB786079A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL326378X 1954-02-09

Publications (1)

Publication Number Publication Date
GB786079A true GB786079A (en) 1957-11-13

Family

ID=19784186

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3400/55A Expired GB786079A (en) 1954-02-09 1955-02-04 Improvements in or relating to monitoring devices used in carrier-wave telephone systems

Country Status (7)

Country Link
US (1) US2851529A (en:Method)
BE (1) BE535541A (en:Method)
CH (1) CH326378A (en:Method)
DE (1) DE1010111B (en:Method)
FR (1) FR1122282A (en:Method)
GB (1) GB786079A (en:Method)
NL (2) NL99204C (en:Method)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1256711B (de) * 1962-05-30 1967-12-21 Nippon Electric Co Fernsteuer- und UEberwachungssystem fuer ein Nachrichtenuebertragungsnetzwerk
DE1269671B (de) * 1964-05-27 1968-06-06 Siemens Ag Anordnung zur Fehlerortung von auf der Leitung bzw. den Zwischenverstaerkerstellen auftretenden Fehlern in Traegerfrequenzsystemen
FR2153639A6 (en:Method) * 1967-03-29 1973-05-04 Cit Alcatel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE497204C (de) * 1925-01-01 1930-05-03 Telefunken Gmbh Anordnung zum Fernanzeigen von veraenderlichen physikalischen Groessen, wie z. B. elektrischen Spannungen, Stroemen, Leistungen, Umdrehungsgeschwindig-keiten, Drucken, Temperaturen u. dgl., mittels hochfrequenter Schwingungen
US2300415A (en) * 1941-04-26 1942-11-03 Bell Telephone Labor Inc Transmission control
BE498814A (en:Method) * 1949-10-21 1900-01-01

Also Published As

Publication number Publication date
FR1122282A (fr) 1956-09-04
NL99204C (en:Method) 1900-01-01
DE1010111B (de) 1957-06-13
US2851529A (en) 1958-09-09
CH326378A (de) 1957-12-15
NL184989B (nl)
BE535541A (en:Method) 1900-01-01

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