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ZA834517B - Apparatus for use with a subscriber connection circuit in a telecommunications exchange - Google Patents

Apparatus for use with a subscriber connection circuit in a telecommunications exchange

Info

Publication number
ZA834517B
ZA834517B ZA834517A ZA834517A ZA834517B ZA 834517 B ZA834517 B ZA 834517B ZA 834517 A ZA834517 A ZA 834517A ZA 834517 A ZA834517 A ZA 834517A ZA 834517 B ZA834517 B ZA 834517B
Authority
ZA
South Africa
Prior art keywords
switching
subscriber connection
ohmic
circuit
supply
Prior art date
Application number
ZA834517A
Inventor
Werner Nagler
Walter Obler
Kurt Kovar
Original Assignee
Siemens 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 Siemens Ag filed Critical Siemens Ag
Publication of ZA834517B publication Critical patent/ZA834517B/en

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/026—Arrangements for interrupting the ringing current

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Exchange Systems With Centralized Control (AREA)

Abstract

1. A circuit arrangement for determining the switching state of a subscriber connection line (TL) in telecommunications systems, the line wires (a, b) of which are each connected to one of the two poles of the supply voltage source (UB) via a supply element which, for switch-over between high-ohmic and low-ohmic supply, can in part be bridged in low-ohmic fashion by means of switching means (Ka, Kb), by evaluating the potential state at line-wire-related, fixed coupling points in the subscriber connection circuit which forms the exchange-end terminal of the respective subscriber connection line, with an indication circuit (K) which, by means of a cyclically operated, first electronic selection switching element (A1), can be consecutively connected to a plurality of subscriber connection lines, and which, in dependence upon the operating state of each subscriber connection circuit, set by a central contral device, is used to carry out different kinds of indications, for which purpose it is supplied with different reference voltage values which depend upon the nature of the indications, with capacitors (CS) which can each be separately connected by means of a second electronic switching element (A2) for the indication circuit (K) in dependence upon the switching position of the first selection switching element (A1), and which can be actuated in dependence upon the nature of the indication which is to be carried out, and which each serve for filtering purposes, and with switching means (kr) which serve to connect an a.c. ringing voltage (UR) to the wires of the subscriber connection line, characterized in that the first and second electronic selection switching elements (A1, A2) are each temporarily blocked in respect to the passage of current in the event of a switching position change in excess of the duration of the respective switching process, and that the first selection switching element (A1) is blocked in respect of the passage of current in the event of the connection and disconnection of the ringing a.c. voltage (UR) during a time which corresponds to the response- and drop-out times of the aforesaid connection means (kr) and switching means (ka, kb) which effect a switch-over between high-ohmic and low-ohmic supply.
ZA834517A 1982-06-22 1983-06-21 Apparatus for use with a subscriber connection circuit in a telecommunications exchange ZA834517B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3223292A DE3223292C2 (en) 1982-06-22 1982-06-22 Circuit arrangement for determining the switching state of a subscriber line in telecommunications systems

Publications (1)

Publication Number Publication Date
ZA834517B true ZA834517B (en) 1984-03-28

Family

ID=6166563

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA834517A ZA834517B (en) 1982-06-22 1983-06-21 Apparatus for use with a subscriber connection circuit in a telecommunications exchange

Country Status (5)

Country Link
EP (1) EP0097354B1 (en)
AT (1) ATE32970T1 (en)
BR (1) BR8303292A (en)
DE (1) DE3223292C2 (en)
ZA (1) ZA834517B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2096514B1 (en) * 1993-12-31 1998-02-16 Telefonica Nacional Espana Co POINT EXPLORATION CIRCUIT.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2938998C2 (en) * 1979-09-26 1984-12-13 Siemens AG, 1000 Berlin und 8000 München Circuit arrangement for an indicator circuit which registers the switching states of a transmission line, in particular a subscriber line, in telephone switching systems
DE2939009A1 (en) * 1979-09-26 1981-04-09 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENT FOR DETERMINING THE SWITCHING STATE OF A SUBSCRIBER CONNECTION LINE IN TELEPHONE SWITCHING SYSTEMS
DE3207318A1 (en) * 1982-03-01 1983-09-08 Siemens AG, 1000 Berlin und 8000 München SUBSCRIBER CONNECTION CIRCUIT WITH LOW-RESISTANT BRIDGE-FREE FOUNDATION RESISTORS AND DIFFERENT INDICATIONS THROUGH INDICATION CIRCUIT

Also Published As

Publication number Publication date
EP0097354B1 (en) 1988-03-09
EP0097354A3 (en) 1985-09-18
DE3223292C2 (en) 1986-11-27
EP0097354A2 (en) 1984-01-04
BR8303292A (en) 1984-02-07
ATE32970T1 (en) 1988-03-15
DE3223292A1 (en) 1983-12-22

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