GB1348476A - Telephone subscriberstation circuit arrangements - Google Patents

Telephone subscriberstation circuit arrangements

Info

Publication number
GB1348476A
GB1348476A GB1172372A GB1172372A GB1348476A GB 1348476 A GB1348476 A GB 1348476A GB 1172372 A GB1172372 A GB 1172372A GB 1172372 A GB1172372 A GB 1172372A GB 1348476 A GB1348476 A GB 1348476A
Authority
GB
United Kingdom
Prior art keywords
diodes
bridge circuit
voltage
zener diodes
diverter
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
GB1172372A
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.)
Siemens AG
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
Priority claimed from DE19712115670 external-priority patent/DE2115670C2/en
Priority claimed from DE19712115757 external-priority patent/DE2115757B2/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1348476A publication Critical patent/GB1348476A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H04M1/745—Protection devices or circuits for voltages surges on the line
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

1348476 Sub-station circuits; voltage limiters; protecting transistors against excess voltage SIEMENS AG 14 March 1972 [31 March 1971 (2)] 11723/72 Headings H4K and H3T A rectifier bridge circuit for protecting subscriber equipment against polarity reversals and voltage surges on the subscriber line comprises two Zener diodes connected in series opposition between the two wires of the line and two diodes which are oppositely poled to one another connected in reverse sequence to said Zener diodes across the series arrangement thereof, the equipment to be protected being connected between the junction point of the two Zener diodes and the junction point of the two diodes. The two diodes may form part of an integrated circuit carrying the subscriber equipment circuitry. Such a bridge circuit comprising components Z1, Z2, D1, D2 is shown in use with a standard subscriber telephone set in which a receiving amplifier EV and a transmitting amplifier SV are employed, the circuitry JS shown within the broken line being formed as an integrated circuit. The arrangement GA is for metering purposes and a filter circuit TP is used to prevent control pulses for a meter Z from reaching the bridge circuit. Further protection is afforded by a surge voltage diverter UA connected at the input to the subscriber equipment, this diverter having a response voltage which is substantially higher than that of the Zener diodes in the bridge circuit; an impedance L in the filter TP serves as a decoupling resistance between the diverter and bridge circuits. In the absence of any metering arrangement, a separate decoupling resistor must be used. A further less complicated embodiment is described with reference to Figs. 1 and 2 (not shown), in which an impedance in the antiside tone bridge circuit of the equipment acts as the decoupling resistor. Terminals T1, T3 may be provided for the inclusion of a push-button dialling device instead of a rotary dial, the terminals T2, T3 being connected when a rotary dial is used.
GB1172372A 1971-03-31 1972-03-14 Telephone subscriberstation circuit arrangements Expired GB1348476A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712115670 DE2115670C2 (en) 1971-03-31 1971-03-31 Circuit arrangement for telephone stations with surge-protected and polarity-independent microphone amplifiers in integrated monolithic technology
DE19712115757 DE2115757B2 (en) 1971-03-31 1971-03-31 CIRCUIT ARRANGEMENT FOR THE PROTECTION OF CONNECTING CABLES WITH DC SUPPLIED EQUIPMENT IN REMOTE INDICATORS, IN PARTICULAR TELEPHONE SYSTEMS

Publications (1)

Publication Number Publication Date
GB1348476A true GB1348476A (en) 1974-03-20

Family

ID=25760899

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1172372A Expired GB1348476A (en) 1971-03-31 1972-03-14 Telephone subscriberstation circuit arrangements

Country Status (8)

Country Link
BE (1) BE781592A (en)
CH (1) CH543202A (en)
FR (1) FR2132175B1 (en)
GB (1) GB1348476A (en)
IT (1) IT950824B (en)
LU (1) LU65062A1 (en)
NL (1) NL7203908A (en)
SE (1) SE366449B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006787A1 (en) * 1986-04-30 1987-11-05 Standard Telephones And Cables Pty. Limited Telephone protection circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987006787A1 (en) * 1986-04-30 1987-11-05 Standard Telephones And Cables Pty. Limited Telephone protection circuit
GB2211696A (en) * 1986-04-30 1989-07-05 Stc Plc Telephone protection circuit
GB2211696B (en) * 1986-04-30 1990-02-28 Stc Plc Telephone protection circuit

Also Published As

Publication number Publication date
NL7203908A (en) 1972-10-03
IT950824B (en) 1973-06-20
LU65062A1 (en) 1972-07-11
FR2132175B1 (en) 1973-06-29
FR2132175A1 (en) 1972-11-17
SE366449B (en) 1974-04-22
CH543202A (en) 1973-10-15
BE781592A (en) 1972-10-02

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee