GB1092975A - Circuit arrangement for telecommunication, particularly telephone installations withdirect-current feed of the subscriber's stations - Google Patents

Circuit arrangement for telecommunication, particularly telephone installations withdirect-current feed of the subscriber's stations

Info

Publication number
GB1092975A
GB1092975A GB938066A GB938066A GB1092975A GB 1092975 A GB1092975 A GB 1092975A GB 938066 A GB938066 A GB 938066A GB 938066 A GB938066 A GB 938066A GB 1092975 A GB1092975 A GB 1092975A
Authority
GB
United Kingdom
Prior art keywords
transistor
subscriber
withdirect
telecommunication
stations
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
GB938066A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1092975A publication Critical patent/GB1092975A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

1,092,975. Automatic exchange systems; transistor switching circuits. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. March 3, 1966 [March 3, 1965], No. 9380/66. Heading H3T and H4K. A subscriber's line circuit feeds the line with D.C. over a transformer OLU and transistor T1 which becomes conducting when the loop is closed, and a second transistor T2 having negative feedback by way of a capacitor C and threshold diode Z responds to dialling and supervisory conditions. The transistor T2, normally conducting, is cut off when T1 responds to the closure of the loop and capacitor C charges to reduce the potential at point B as indicated at D, Fig. 2. In response to dial impulses, the base current of T2 increases and it acts as a Miller integrator, giving the effect shown at E, Fig. 2. When release occurs, integration continues until point A reaches zero potential, G, Fig. 2. Transistors T3, T4 which are differently biased respond to dialling release conditions.
GB938066A 1965-03-03 1966-03-03 Circuit arrangement for telecommunication, particularly telephone installations withdirect-current feed of the subscriber's stations Expired GB1092975A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET28087A DE1219543B (en) 1965-03-03 1965-03-03 Circuit arrangement for telecommunication, in particular telephone systems with direct current supply of the subscriber stations

Publications (1)

Publication Number Publication Date
GB1092975A true GB1092975A (en) 1967-11-29

Family

ID=7553914

Family Applications (1)

Application Number Title Priority Date Filing Date
GB938066A Expired GB1092975A (en) 1965-03-03 1966-03-03 Circuit arrangement for telecommunication, particularly telephone installations withdirect-current feed of the subscriber's stations

Country Status (4)

Country Link
AT (1) AT254285B (en)
CH (1) CH430805A (en)
DE (1) DE1219543B (en)
GB (1) GB1092975A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388497A (en) * 1980-02-28 1983-06-14 Licentia Patent-Verwaltungs-G.M.B.H. Telephone power supply arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388497A (en) * 1980-02-28 1983-06-14 Licentia Patent-Verwaltungs-G.M.B.H. Telephone power supply arrangement

Also Published As

Publication number Publication date
DE1219543B (en) 1966-06-23
CH430805A (en) 1967-02-28
AT254285B (en) 1967-05-10

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