GB1501235A – Circuit arrangement for use in a telephone set
– Google Patents
GB1501235A – Circuit arrangement for use in a telephone set
– Google Patents
Circuit arrangement for use in a telephone set
Info
Publication number
GB1501235A
GB1501235A
GB12275/75A
GB1227575A
GB1501235A
GB 1501235 A
GB1501235 A
GB 1501235A
GB 12275/75 A
GB12275/75 A
GB 12275/75A
GB 1227575 A
GB1227575 A
GB 1227575A
GB 1501235 A
GB1501235 A
GB 1501235A
Authority
GB
United Kingdom
Prior art keywords
converter
voltage
block
march
core cable
Prior art date
1974-03-29
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
GB12275/75A
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.)
1974-03-29
Filing date
1975-03-24
Publication date
1978-02-15
1975-03-24
Application filed by Telefonaktiebolaget LM Ericsson AB
filed
Critical
Telefonaktiebolaget LM Ericsson AB
1978-02-15
Publication of GB1501235A
publication
Critical
patent/GB1501235A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04M—TELEPHONIC COMMUNICATION
H04M19/00—Current supply arrangements for telephone systems
H04M19/08—Current supply arrangements for telephone systems with current supply sources at the substations
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
Abstract
1501235 Impulse transmitters TELEFONAKTIEBOLAGET L M ERICSSON 24 March 1975 [29 March 1974] 12275/75 Heading H4K In an impulse generator including a storage block M for converting digits entered at a keyboard K into corresponding pulse trains which are transmitted over a telephone line L A , L B the operating voltage and clock pulses for block M are provided by a D.C. converter L which includes an oscillator O. The converter L is powered from the line under closed loop conditions and from a storage capacitor C during loop breaks. Its output voltage is greater than the line voltage. Voltage regulation for the converter L is provided either by a series transistor T2 or by a parallel transistor pair T3 according to the output (pulsed or quiescent) from block M. In a first modification, Fig. 3 (not shown) the parallel regulation is dispensed with. The arrangement of Fig. 1 requires a four-core cable (attached to points L A , L B , E A , E B ) for connection to the circuitry of a conventional substation. However, in a further modification, Fig. 4 (not shown) only three-core cable is required.
GB12275/75A
1974-03-29
1975-03-24
Circuit arrangement for use in a telephone set
Expired
GB1501235A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
SE7404278A
SE386341B
(en)
1974-03-29
1974-03-29
CONNECTION DEVICE FOR A TELEPHONE DEVICE INCLUDING A DC CONVERTER.
Publications (1)
Publication Number
Publication Date
GB1501235A
true
GB1501235A
(en)
1978-02-15
Family
ID=20320685
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB12275/75A
Expired
GB1501235A
(en)
1974-03-29
1975-03-24
Circuit arrangement for use in a telephone set
Country Status (10)
Country
Link
US
(1)
US3980837A
(en)
CA
(1)
CA1007776A
(en)
CH
(1)
CH583490A5
(en)
DK
(1)
DK139498B
(en)
FI
(1)
FI750726A
(en)
FR
(1)
FR2266391B1
(en)
GB
(1)
GB1501235A
(en)
IT
(1)
IT1034753B
(en)
NO
(1)
NO136776C
(en)
SE
(1)
SE386341B
(en)
Families Citing this family (17)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
SE7608076L
(en)
*
1975-07-25
1977-01-26
Carlo Baldoni
TEN NUMBER PROVIDED, DIGITAL NUMBER RECEIVER OF KEY TYPE
US4167655A
(en)
*
1977-10-17
1979-09-11
United Networks Inc.
Push button to rotary dial converter systems
US4232200A
(en)
*
1978-10-23
1980-11-04
United Networks, Inc.
Dialing system
IT1202931B
(en)
*
1979-06-05
1989-02-15
Sits Soc It Telecom Siemens
INTERFACE CIRCUIT FOR ELECTRONIC KEYBOARD WITH REPEAT OF THE SELECTION
DE2931456C2
(en)
*
1979-08-02
1982-10-28
Siemens AG, 1000 Berlin und 8000 München
Parallel control circuit
US4286120A
(en)
*
1979-10-15
1981-08-25
Gte Automatic Electric Labs Inc.
Current regulated pulse dialer circuit
DE2946306A1
(en)
*
1979-11-16
1981-05-21
Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt
AMPLIFIER CIRCUIT WITH VOGEBLE AC INTERNAL RESISTANCE
NL8001135A
(en)
*
1980-02-26
1981-09-16
Philips Nv
LINE INTERRUPTION DEVICE.
FR2500691A1
(en)
*
1981-02-23
1982-08-27
Pays Gerard
Supply module for telephone bell – uses current imaging to alter the current drawn by circuit as instantaneous voltage falls below threshold, reducing current harmonics
US4413159A
(en)
*
1982-04-02
1983-11-01
Bell Telephone Laboratories, Incorporated
Dial pulsing circuit
FR2526252B1
(en)
*
1982-05-03
1986-12-19
Constr Telephoniques
CURRENT CONTROL CIRCUIT OF A TRANSMISSION LINE
DE3513625A1
(en)
*
1985-04-16
1986-10-23
Nixdorf Computer Ag, 4790 Paderborn
CIRCUIT ARRANGEMENT FOR THE REMOTE POWER SUPPLY OF SUBSCRIBER TERMINALS IN TELECOMMUNICATION SYSTEMS
DE3628996A1
(en)
*
1986-08-26
1988-03-10
Krone Ag
CIRCUIT ARRANGEMENT FOR A TELEPHONE
EP0363362A4
(en)
*
1987-04-09
1991-03-20
Standard Telephones And Cables Pty. Limited
Telephone subset circuit arrangement
DE3843083A1
(en)
*
1988-12-21
1990-06-28
Siemens Ag
Voltage supply for the microprocessor of a line-fed telephone station
KR20010014351A
(en)
*
1998-05-04
2001-02-26
요트.게.아. 롤페즈
A telephone line interface circuit with ac and dc line adjustment
US7706526B2
(en)
*
2005-10-11
2010-04-27
Phylogy, Inc.
Method and apparatus for powering electronics associated with a telephone line twisted pair
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR1569618A
(en)
*
1967-12-08
1969-06-06
GB1395577A
(en)
*
1972-05-11
1975-05-29
Standard Telephones Cables Ltd
Telephones
US3787639A
(en)
*
1972-11-16
1974-01-22
Northern Electric Co
Pushbutton electronic pulsing dial
US3881070A
(en)
*
1973-03-01
1975-04-29
Mel Tronix Lab Corp
Train pulse generator
1974
1974-03-29
SE
SE7404278A
patent/SE386341B/en
unknown
1975
1975-03-12
US
US05/557,655
patent/US3980837A/en
not_active
Expired – Lifetime
1975-03-13
FI
FI750726A
patent/FI750726A/fi
not_active
Application Discontinuation
1975-03-24
GB
GB12275/75A
patent/GB1501235A/en
not_active
Expired
1975-03-26
DK
DK134375AA
patent/DK139498B/en
unknown
1975-03-26
NO
NO751089A
patent/NO136776C/en
unknown
1975-03-27
CA
CA223,265A
patent/CA1007776A/en
not_active
Expired
1975-03-28
FR
FR7509820A
patent/FR2266391B1/fr
not_active
Expired
1975-03-31
CH
CH403775A
patent/CH583490A5/xx
not_active
IP Right Cessation
1975-07-02
IT
IT21808/75A
patent/IT1034753B/en
active
Also Published As
Publication number
Publication date
NO136776B
(en)
1977-07-25
NO136776C
(en)
1977-11-02
SE7404278L
(en)
1975-09-30
FI750726A
(en)
1975-09-30
FR2266391A1
(en)
1975-10-24
SE386341B
(en)
1976-08-02
NO751089L
(en)
1975-09-30
US3980837A
(en)
1976-09-14
FR2266391B1
(en)
1979-03-16
DK134375A
(en)
1975-09-30
IT1034753B
(en)
1979-10-10
CA1007776A
(en)
1977-03-29
CH583490A5
(en)
1976-12-31
DK139498B
(en)
1979-02-26
DK139498C
(en)
1979-08-06
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ALL-UNION
Legal Events
Date
Code
Title
Description
1978-06-28
PS
Patent sealed [section 19, patents act 1949]
1980-11-05
PCNP
Patent ceased through non-payment of renewal fee
