ES387709A1 - Apparatus for indicating the holding condition and or the non-holding condition on a subscribers line - Google Patents

Apparatus for indicating the holding condition and or the non-holding condition on a subscribers line

Info

Publication number
ES387709A1
ES387709A1 ES387709A ES387709A ES387709A1 ES 387709 A1 ES387709 A1 ES 387709A1 ES 387709 A ES387709 A ES 387709A ES 387709 A ES387709 A ES 387709A ES 387709 A1 ES387709 A1 ES 387709A1
Authority
ES
Spain
Prior art keywords
state
occupation
output signal
wires
indication
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
ES387709A
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.)
Zellweger Uster AG
Original Assignee
Zellweger Uster AG
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 Zellweger Uster AG filed Critical Zellweger Uster AG
Publication of ES387709A1 publication Critical patent/ES387709A1/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)
  • Monitoring And Testing Of Exchanges (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

Improvements in devices for obtaining an indication of the state of occupation and/or the state of unemployment on a subscriber telephone line, characterized in that for the achievement of the independence of said indications of the type of polar position of the line wires with respect to the supply of the subscriber line, and/or to avoid the faulty indication of the opposite states, at least in one of the two mentioned states, to the interruption in the supply of the subscriber line, each of the two wires is linked on a low-pass filter each with a device of a certain level each, and between the outputs of the devices of a certain level a potential comparing device is connected by means of whose output signal the status of occupation and/or unemployment; and because, on the one hand, the necessary voltage value at the input of the low-pass filter for the reaction of the determined level device is chosen as maximum as high as the minimum potential jump that occurs on each of the wires when changing the occupation state, and on the other hand, the output signal and the connection state respectively of the potential comparator device, for that state in which the indication to the power interruption must not vary, is chosen equal to that output signal and connection status respectively that are respectively adjusted with the power interrupted. (Machine-translation by Google Translate, not legally binding)
ES387709A 1970-02-03 1971-01-28 Apparatus for indicating the holding condition and or the non-holding condition on a subscribers line Expired ES387709A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH156470A CH519835A (en) 1970-02-03 1970-02-03 Method and device for displaying the status of the occupancy on a subscriber line

Publications (1)

Publication Number Publication Date
ES387709A1 true ES387709A1 (en) 1974-02-16

Family

ID=4213371

Family Applications (1)

Application Number Title Priority Date Filing Date
ES387709A Expired ES387709A1 (en) 1970-02-03 1971-01-28 Apparatus for indicating the holding condition and or the non-holding condition on a subscribers line

Country Status (7)

Country Link
CH (1) CH519835A (en)
DE (1) DE2100458C3 (en)
ES (1) ES387709A1 (en)
FI (1) FI56086C (en)
GB (1) GB1327862A (en)
NO (1) NO130448C (en)
SE (1) SE354954B (en)

Also Published As

Publication number Publication date
SE354954B (en) 1973-03-26
DE2100458C3 (en) 1980-06-04
NO130448C (en) 1974-12-18
DE2100458A1 (en) 1971-08-12
CH519835A (en) 1972-02-29
NO130448B (en) 1974-09-02
GB1327862A (en) 1973-08-22
FI56086B (en) 1979-07-31
FI56086C (en) 1979-11-12
DE2100458B2 (en) 1979-09-13

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