US1833586A - Call metering circuits in telephone systems - Google Patents

Call metering circuits in telephone systems Download PDF

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Publication number
US1833586A
US1833586A US462105A US46210530A US1833586A US 1833586 A US1833586 A US 1833586A US 462105 A US462105 A US 462105A US 46210530 A US46210530 A US 46210530A US 1833586 A US1833586 A US 1833586A
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US
United States
Prior art keywords
call
line
meter
wire
call meter
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 - Lifetime
Application number
US462105A
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English (en)
Inventor
Nilsson Nils Emil
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Application granted granted Critical
Publication of US1833586A publication Critical patent/US1833586A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/02—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having conical surfaces; Packings therefor
    • F16K5/0257—Packings
    • F16K5/0271—Packings between housing and plug
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP
    • H04M15/10—Metering calls from calling party, i.e. A-party charged for the communication

Definitions

  • the relay SR then starts In certain call metering systems in telephone plants it is preferred to have the call meter permanently connected to one of the line branches of the talking connection, usually the third or test wire. Measures must then be taken to prevent an undesirable actuation of the call meter through other currents passing through said line branch.
  • the present invention has for its object a circuit arrangement of this kind and consists substantially therein that the call meter is blocked against undesirable currents by a rectifier connected into the circuit of the call meter or another similar equivalent device, which lets through the current only in the one direction.
  • the actuation of the call meter is then eflected simply by a change in the potential of the point where the call meter is connected to the line branch in question, which change of potential causes a flow of current in the desired direction.
  • the subscribers line L is provided with a line relay LR, acut ofi relay BR, and a call meter SM which, according to the invention, isconnected to the third wire '0 belonging to the subscribers line over a rectifier LS which may be or" any arbitrary known kind. Preferably a metallic rectifier is used.
  • the two talking line branches A, B of the subscribers line together with the third wire 0 are in the shown example connected to fixed contacts, ale, bk, 0k in the contact field of the'call finder of which only the test contact arm PK and a stop relay PR are shown on the drawing.
  • the line and cut oil relays are provided with two contact springs k is, which are adapted to be actuated by the two relays.
  • the line relay LR Upon a call, the line relay LR is first energized in the usual manner over a subscribers line, the circuit of the relay SR being closed the call finder in known manner.
  • the finder finds the calling line a circuit 2 is closed over the third wire through the cut oil relay BR which disconnects the line relay LR and locks itself over the contact 3. At the same time the call finder is brought to stop.
  • the call meter SM is included between the earthed positive pole of the central battery, not shown on the drawing, and the third wire 0.
  • the rectifier LS is included between the call meter and the third wire in such a manner that said current closing over the third wire has no influence upon the call meter as that current, which otherwise would pass from the positive pole of the central battery to the third wire, is blocked by the rectifier.
  • the call meter may then, without disturbing the talking connection, be actuated one or more times by changing the potential in the third wire 0 in such a manner that current is passing through the call meter in the direction from the third wire.
  • this is brought about by that the third wire, by means of the contact device K, is switched without current interruption from the positive pole of the central battery to the positive pole of an additional battery EB which is series connected with the central battery and thus by its negative pole is connected to earth.
  • a resistance R prevents short-circuit of the battery EB during the shifting.
  • a circuit 3 is now closedv through the call meter SM in which circuit the current flows in such a direction that the call meter is actuated.
  • the call meter may in this manner be actuated during the conversation an arbitrary number of times by a repeated actuation of the contact device K.
  • a line In a telephone system, a line, a call meter connected to one of the line branches, a rectifying device which lets through current in only the one direction connected in series with the call meter to the line branch.
  • a line a call meter connected to one of the line branches, a rectifying device which lets through current in only the one direction connected in series with the call meter to the line branch, a uni-directional current-source connected in series with I the call meter, a central current source, and

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Interface Circuits In Exchanges (AREA)
US462105A 1929-06-21 1930-06-18 Call metering circuits in telephone systems Expired - Lifetime US1833586A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE357620X 1929-06-21

Publications (1)

Publication Number Publication Date
US1833586A true US1833586A (en) 1931-11-24

Family

ID=20308835

Family Applications (1)

Application Number Title Priority Date Filing Date
US462105A Expired - Lifetime US1833586A (en) 1929-06-21 1930-06-18 Call metering circuits in telephone systems

Country Status (5)

Country Link
US (1) US1833586A (fr)
BE (1) BE371304A (fr)
DE (1) DE606072C (fr)
FR (1) FR697616A (fr)
GB (1) GB357620A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969460C (de) * 1954-04-08 1958-06-04 Friedrich Merk Telefonbau Ag Schaltungsanordnung fuer die Steuerung ueberlagerter Stromkreise in kleinen Fernsprechnebenstellenanlagen

Also Published As

Publication number Publication date
FR697616A (fr) 1931-01-20
BE371304A (fr)
GB357620A (en) 1931-09-18
DE606072C (de) 1934-11-24

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