GB1394148A - Push-button telphone subset - Google Patents

Push-button telphone subset

Info

Publication number
GB1394148A
GB1394148A GB4188173A GB4188173A GB1394148A GB 1394148 A GB1394148 A GB 1394148A GB 4188173 A GB4188173 A GB 4188173A GB 4188173 A GB4188173 A GB 4188173A GB 1394148 A GB1394148 A GB 1394148A
Authority
GB
United Kingdom
Prior art keywords
contact
diode
capacitor
impulsing
relay
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
GB4188173A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1394148A publication Critical patent/GB1394148A/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
    • H04M1/26—Devices for calling a subscriber
    • H04M1/30—Devices which can set up and transmit only one digit at a time
    • H04M1/31—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses
    • H04M1/312—Devices which can set up and transmit only one digit at a time by interrupting current to generate trains of pulses; by periodically opening and closing contacts to generate trains of pulses pulses produced by electronic circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephonic Communication Services (AREA)

Abstract

1394148 Substation equipment INTERNATIONAL STANDARD ELECTRIC CORP 6 Sept 1973 [11 Sept 1972] 41881/73 Heading H4K A push button impulse transmitter, which utilizes a latching relay for producing loop disconnect pulses under the control of an electronic decoding circuit, is powered by a capacitor that is charged over the line via the impulsing contact when this and the hook switch contacts are closed. The capacitor is connected in series with the shunt combination of a resistor and a diode, the latter being reverse biased during charging and forward biased during discharging, i.e. during dialling loop interrupts, so as to present a low internal impedance to the load. An appropriately biased transistor may replace the diode. With hook switch contacts Gs1, Gs2 closed, the line loop is maintained via contact S1 in the push button key block. When any key is operated, S1 opens so as to transfer the line loop to the Zener diode stabilized diode bridge D1-D4. If impulsing contact IC is not closed at this time, transistor amplifier T7, T8 is effective to energize impulsing relay IR so that a charging circuit for storage capacitor C5 is made. A network consisting of capacitor CR, resistor RR and diode DR produces a resetting pulse for a MOST logic decoding circuit M and clock C is started. The operation of the push button also actuates contact S2 which causes a contact-bounce blanking network CB, RB3 and transistor amplifier T3, T4 to bring-up offnormal relay ONR. The latter short circuits the speech network at its contact ONC. About 800 msec. after the depression of the button, the logic finishes decoding the digit value and via amplifier T5, T6 causes impulsing relay IR to generate the appropriate impulse train. During breaks in the train, capacitor CS in its discharge path via diode DS provides the requisite power for the circuit components.
GB4188173A 1972-09-11 1973-09-06 Push-button telphone subset Expired GB1394148A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPB038672 1972-09-11

Publications (1)

Publication Number Publication Date
GB1394148A true GB1394148A (en) 1975-05-14

Family

ID=3765315

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4188173A Expired GB1394148A (en) 1972-09-11 1973-09-06 Push-button telphone subset

Country Status (3)

Country Link
DE (1) DE2345508A1 (en)
FR (1) FR2199236B1 (en)
GB (1) GB1394148A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1521468A (en) * 1974-10-11 1978-08-16 Standard Telephones Cables Ltd Circuit arrangement for telephone subset
FR2319256A1 (en) * 1975-07-23 1977-02-18 Bailleul Roland French telephone network line keyboard adaptor - has circuits to suppress listening control during numbering
DE2536200C2 (en) * 1975-08-13 1983-04-21 Standard Elektrik Lorenz Ag, 7000 Stuttgart Circuit arrangement for monitoring a voice wire in telephone sets
DE3801841A1 (en) * 1988-01-20 1989-08-03 Deutsche Telephonwerk Kabel Circuit arrangement for dial keypads in communications terminals

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1229154B (en) * 1965-04-30 1966-11-24 Maack Elmewe Circuit arrangement for charge counters in telephone subscriber stations
DE2043611A1 (en) * 1970-09-03 1972-03-09 Tn Charging circuit for capacitors at the end of a line carrying only low power in telecommunications systems
BE788732A (en) * 1971-09-13 1973-03-13 Int Standard Electric Corp KEYPAD TELEPHONE STATION
CH537679A (en) * 1971-10-29 1973-05-31 Sodeco Compteurs De Geneve Device for feeding additional devices in telephone stations
BE794179A (en) * 1972-01-21 1973-07-18 Itt INTEGRATED CIRCUIT FOR SELECTING SUBSCRIPTION NUMBERS WITH PUSH BUTTONS

Also Published As

Publication number Publication date
FR2199236A1 (en) 1974-04-05
FR2199236B1 (en) 1978-01-13
DE2345508A1 (en) 1974-03-28

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee