GB2024564B – Connecting circuit for a telephone line
– Google Patents
GB2024564B – Connecting circuit for a telephone line
– Google Patents
Connecting circuit for a telephone line
Info
Publication number
GB2024564B
GB2024564B
GB7921834A
GB7921834A
GB2024564B
GB 2024564 B
GB2024564 B
GB 2024564B
GB 7921834 A
GB7921834 A
GB 7921834A
GB 7921834 A
GB7921834 A
GB 7921834A
GB 2024564 B
GB2024564 B
GB 2024564B
Authority
GB
United Kingdom
Prior art keywords
telephone line
connecting circuit
circuit
telephone
line
Prior art date
1978-06-26
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
GB7921834A
Other versions
GB2024564A
(en
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.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
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.)
1978-06-26
Filing date
1979-06-22
Publication date
1982-06-09
1978-06-26
Priority claimed from FR7818960A
external-priority
patent/FR2430153A1/en
1979-06-22
Application filed by Telecommunications Radioelectriques et Telephoniques SA TRT
filed
Critical
Telecommunications Radioelectriques et Telephoniques SA TRT
1980-01-09
Publication of GB2024564A
publication
Critical
patent/GB2024564A/en
1982-06-09
Application granted
granted
Critical
1982-06-09
Publication of GB2024564B
publication
Critical
patent/GB2024564B/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
H04M19/001—Current supply source at the exchanger providing current to substations
H04M19/005—Feeding arrangements without the use of line transformers
GB7921834A
1978-06-26
1979-06-22
Connecting circuit for a telephone line
Expired
GB2024564B
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
FR7818960A
FR2430153A1
(en)
1978-06-26
1978-06-26
Telephone line and exchange connecting connecting circuit – forms current which is equal to weighted sum of current in wires with equal weighting coefficients
FR7827762A
FR2437757A2
(en)
1978-06-26
1978-09-28
SUBSCRIBER TRUNK FOR ENSURING TWO-WIRE OR FOUR-WIRE COUPLING WITH A TELEPHONE CENTRAL
Publications (2)
Publication Number
Publication Date
GB2024564A
GB2024564A
(en)
1980-01-09
GB2024564B
true
GB2024564B
(en)
1982-06-09
Family
ID=26220644
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB7921834A
Expired
GB2024564B
(en)
1978-06-26
1979-06-22
Connecting circuit for a telephone line
Country Status (10)
Country
Link
US
(1)
US4275277A
(en)
JP
(1)
JPS6030468B2
(en)
AU
(1)
AU521488B2
(en)
BE
(1)
BE877247A
(en)
CA
(1)
CA1137666A
(en)
CH
(1)
CH648170A5
(en)
DE
(1)
DE2925000C2
(en)
FR
(1)
FR2437757A2
(en)
GB
(1)
GB2024564B
(en)
SE
(1)
SE437320B
(en)
Families Citing this family (15)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2460078B1
(en)
*
1979-06-25
1986-12-12
Trt Telecom Radio Electr
ELECTRONIC SUBSCRIBER
US4359609A
(en)
*
1980-06-20
1982-11-16
Advanced Micro Devices, Inc.
Circuit with feedback for controlling the impedance thereof
NL8004970A
(en)
*
1980-09-02
1982-04-01
Philips Nv
DEVICE FOR EXCHANGING SIGNALS BETWEEN SEPARATED SWITCHING DEVICES.
NL8100242A
(en)
*
1981-01-20
1982-08-16
Philips Nv
OVERVOLTAGE PROTECTION OF A LINE CIRCUIT.
IT1211072B
(en)
*
1981-06-30
1989-09-29
Ates Componenti Elettron
BRIDGE TRANSISTOR RECTIFIER CIRCUIT FOR TELEPHONE USE.
GB2104330A
(en)
*
1981-08-19
1983-03-02
Texas Instruments Ltd
Improvements in or relating to amplifiers
US4431874A
(en)
*
1981-09-24
1984-02-14
Motorola, Inc.
Balanced current multiplier circuit for a subscriber loop interface circuit
CA1177985A
(en)
*
1981-09-24
1984-11-13
Don W. Zobel
Electronic terminator circuit
US4524246A
(en)
*
1982-07-07
1985-06-18
Harris Corporation
SLIC II–common-mode current rejection
US4665547A
(en)
*
1984-11-02
1987-05-12
At&T Company
Limiting amplifier for common mode feedback in telephone line feed circuits
IT1215254B
(en)
*
1985-03-20
1990-01-31
Ates Componenti Elettron
CIRCUIT, MONOLITHICALLY INTEGRABLE, FOR THE MEASUREMENT OF LONGITUDINAL AND TRANSVERSAL CURRENTS IN A TWO-WIRE TRANSMISSION LINE.
IT1214603B
(en)
*
1985-04-30
1990-01-18
Ates Componenti Elettron
TELEPHONE CIRCUIT, MONOLITHICALLY INTEGRABLE, FOR THE SUPPLY OF A USER TELEPHONE LINE.
US4827505A
(en)
*
1985-08-20
1989-05-02
Fujitsu Limited
Subscriber line interface circuit
JPH0618396B2
(en)
*
1989-07-03
1994-03-09
ローム株式会社
Power supply circuit for telephone
US5175764A
(en)
*
1990-10-18
1992-12-29
Ag Communication Systems Corporation
Enhanced high voltage line interface circuit
Family Cites Families (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR1583825A
(en)
*
1968-04-19
1969-12-05
NL7208148A
(en)
*
1972-06-15
1973-12-18
US4004109A
(en)
*
1975-05-09
1977-01-18
Boxall Frank S
Hybrid circuit
DE2556157C3
(en)
*
1975-12-11
1979-01-18
Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin
Circuit arrangement for an electronic subscriber feed
US4064377A
(en)
*
1976-03-11
1977-12-20
Wescom Switching, Inc.
Electronic hybrid and hybrid repeater
US4041252A
(en)
*
1976-06-07
1977-08-09
North Electric Company
Transformerless two-wire/four-wire hybrid with DC sourcing capability
US4142075A
(en)
*
1977-10-11
1979-02-27
Burr-Brown Research Corporation
Interface circuit and method for telephone extension lines
1978
1978-09-28
FR
FR7827762A
patent/FR2437757A2/en
active
Granted
1979
1979-06-21
DE
DE2925000A
patent/DE2925000C2/en
not_active
Expired
1979-06-21
SE
SE7905480A
patent/SE437320B/en
unknown
1979-06-21
CA
CA000330330A
patent/CA1137666A/en
not_active
Expired
1979-06-22
GB
GB7921834A
patent/GB2024564B/en
not_active
Expired
1979-06-22
US
US06/051,084
patent/US4275277A/en
not_active
Expired – Lifetime
1979-06-22
CH
CH5877/79A
patent/CH648170A5/en
not_active
IP Right Cessation
1979-06-25
BE
BE0/195949A
patent/BE877247A/en
not_active
IP Right Cessation
1979-06-25
AU
AU48358/79A
patent/AU521488B2/en
not_active
Ceased
1979-06-25
JP
JP54080070A
patent/JPS6030468B2/en
not_active
Expired
Also Published As
Publication number
Publication date
FR2437757A2
(en)
1980-04-25
SE7905480L
(en)
1979-12-27
DE2925000C2
(en)
1984-03-22
FR2437757B2
(en)
1984-01-06
CA1137666A
(en)
1982-12-14
JPS6030468B2
(en)
1985-07-16
CH648170A5
(en)
1985-02-28
BE877247A
(en)
1979-12-27
GB2024564A
(en)
1980-01-09
AU4835879A
(en)
1980-01-03
US4275277A
(en)
1981-06-23
DE2925000A1
(en)
1980-01-10
AU521488B2
(en)
1982-04-01
JPS555595A
(en)
1980-01-16
SE437320B
(en)
1985-02-18
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Legal Events
Date
Code
Title
Description
1994-05-18
732E
Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
1996-07-03
732E
Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
1998-02-11
PCNP
Patent ceased through non-payment of renewal fee
Effective date:
19970622
