GB490015A - Alarm signalling arrangements in connection with telephone and like exchange systems - Google Patents

Alarm signalling arrangements in connection with telephone and like exchange systems

Info

Publication number
GB490015A
GB490015A GB3482/37A GB348237A GB490015A GB 490015 A GB490015 A GB 490015A GB 3482/37 A GB3482/37 A GB 3482/37A GB 348237 A GB348237 A GB 348237A GB 490015 A GB490015 A GB 490015A
Authority
GB
United Kingdom
Prior art keywords
relay
over
circuit
line
call
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
GB3482/37A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB490015A publication Critical patent/GB490015A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Alarm Systems (AREA)
GB3482/37A 1936-05-27 1937-02-05 Alarm signalling arrangements in connection with telephone and like exchange systems Expired GB490015A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE236666X 1936-05-27

Publications (1)

Publication Number Publication Date
GB490015A true GB490015A (en) 1938-08-05

Family

ID=3866331

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3482/37A Expired GB490015A (en) 1936-05-27 1937-02-05 Alarm signalling arrangements in connection with telephone and like exchange systems

Country Status (5)

Country Link
CH (1) CH236666A (enrdf_load_stackoverflow)
DE (1) DE760243C (enrdf_load_stackoverflow)
FR (1) FR822124A (enrdf_load_stackoverflow)
GB (1) GB490015A (enrdf_load_stackoverflow)
NL (1) NL46909C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102944730A (zh) * 2012-11-05 2013-02-27 深圳创维－Rgb电子有限公司 电压异常状态自动检测装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1026374B (de) * 1955-08-30 1958-03-20 Siemens Ag Einrichtung zum gleichzeitigen UEberwachen auf Kurzschluss bzw. Erdschluss und auf Drahtbruch eines zur Durchgabe von Meldungen, insbesondere von Feuermeldungen, dienenden ruhestromueberwachten Leitungspaares
DE1013706B (de) * 1956-01-14 1957-08-14 Telefonbau & Normalzeit Gmbh Schaltungsanordnung zur UEbertragung von Meldungen ueber besprochene Fernsprechanschlussleitungen
DE1086758B (de) * 1957-12-23 1960-08-11 Wilhelm Vershoven Stoerungsmeldevorrichtung, deren UEberwachungsmelder ueber Modulatoren an Fernsprech-teilnehmerleitungen parallel schaltbar sind

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE570938C (de) * 1927-12-29 1933-02-21 Siemens & Halske Akt Ges Schaltungsanordnung fuer Fernsprechanlagen mit Sprechstellen, die mit Selbstbelastungseinrichtungen versehen sind
DE636313C (de) * 1927-12-30 1936-10-10 Siemens & Halske Akt Ges Schaltungsanordnung fuer Fernsprechanlagen zur UEbermittlung von UEberwachungssignalen an eine Beamtin
CH174234A (de) * 1932-12-23 1934-12-31 Siemens Ag Schaltungsanordnung zum Übermitteln von Meldungen, insbesondere Feuer- und Polizeimeldungen, nach einer Meldungsempfangsstelle.
CH181393A (de) * 1934-06-23 1935-12-15 Autophon Ag Schaltungsanordnung für Fernmeldeanlagen.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102944730A (zh) * 2012-11-05 2013-02-27 深圳创维－Rgb电子有限公司 电压异常状态自动检测装置
CN102944730B (zh) * 2012-11-05 2015-06-10 深圳创维－Rgb电子有限公司 电压异常状态自动检测装置

Also Published As

Publication number Publication date
CH236666A (de) 1945-02-28
NL46909C (enrdf_load_stackoverflow)
DE760243C (de) 1953-06-15
FR822124A (fr) 1937-12-21

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