SE7713728L - DEVICE FOR ELECTRONIC POWER SUPPLY FOR SUBSCRIBER DEVICES - Google Patents
DEVICE FOR ELECTRONIC POWER SUPPLY FOR SUBSCRIBER DEVICESInfo
- Publication number
- SE7713728L SE7713728L SE7713728A SE7713728A SE7713728L SE 7713728 L SE7713728 L SE 7713728L SE 7713728 A SE7713728 A SE 7713728A SE 7713728 A SE7713728 A SE 7713728A SE 7713728 L SE7713728 L SE 7713728L
- Authority
- SE
- Sweden
- Prior art keywords
- wire
- arrangement
- current
- loop
- current generators
- Prior art date
Links
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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
The circuit arrangement for an electronic subscriber feed with loop current monitoring, ringing tone connection and hybrid arrangement for the transfer from two-wire to four-wire operation with current generators disposed in a balanced relationship with one another uses operational amplifiers (J1, J2) purely as isolation amplifiers for the current generators. The modulation of the loop current is controlled via the inverted inputs of the operational amplifiers (J1, J2) in such a way that, when the amplification is increased in the modulation arrangement, the dynamic self-balancing of the current generators is increased. When the subscriber loop is open, a differential amplifier (J3) is controlled to achieve a high hybrid loss in such a way that no AC voltage reaches the output (G) on the four-wire side. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19762655005 DE2655005C3 (en) | 1976-12-02 | 1976-12-02 | Circuit arrangement for an electronic subscriber feed |
Publications (1)
Publication Number | Publication Date |
---|---|
SE7713728L true SE7713728L (en) | 1978-06-03 |
Family
ID=5994663
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7713728A SE7713728L (en) | 1976-12-02 | 1977-12-02 | DEVICE FOR ELECTRONIC POWER SUPPLY FOR SUBSCRIBER DEVICES |
Country Status (13)
Country | Link |
---|---|
AT (1) | AT363523B (en) |
BE (1) | BE861297A (en) |
CA (1) | CA1111586A (en) |
CH (1) | CH630209A5 (en) |
DE (1) | DE2655005C3 (en) |
DK (1) | DK533777A (en) |
FR (1) | FR2373201A1 (en) |
GB (1) | GB1587868A (en) |
IE (1) | IE45750B1 (en) |
IT (1) | IT1088708B (en) |
LU (1) | LU78546A1 (en) |
NL (1) | NL7713305A (en) |
SE (1) | SE7713728L (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4203009A (en) * | 1977-08-17 | 1980-05-13 | The Post Office | Unbalanced/balanced converter circuits |
NL7810086A (en) * | 1978-10-06 | 1980-04-09 | Philips Nv | POWER BRIDGE FOR A SUBSCRIBER FLOW. |
DE3014187C2 (en) * | 1980-04-14 | 1983-11-17 | Nixdorf Computer Ag, 4790 Paderborn | Circuit arrangement for the two-wire connection of a telephone subscriber to one line each for incoming and incoming signals |
DE3032970C2 (en) * | 1980-09-02 | 1987-04-16 | Telefonbau Und Normalzeit Gmbh, 6000 Frankfurt | Circuit arrangement for symmetrizing the operating points of electronically DC-fed connecting lines in telecommunications systems, in particular telephone exchanges |
DE3116783C2 (en) * | 1981-04-28 | 1983-09-01 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Circuit arrangement for a subscriber line circuit for telephone systems |
US4431868A (en) * | 1981-07-09 | 1984-02-14 | International Telephone And Telegraph Corporation | Solid state telephone line interface circuit with ringing capability |
DE3138726A1 (en) * | 1981-09-29 | 1983-04-07 | Siemens AG, 1000 Berlin und 8000 München | Subscriber connection circuit for connecting two-wire subscriber connection lines to a four-wire through-connecting digital time division multiplex exchange |
DE3214624C2 (en) * | 1982-04-20 | 1986-05-28 | Siemens AG, 1000 Berlin und 8000 München | Circuit arrangement for evaluating subscriber loop states in telephone systems, in particular in telephone branch exchange systems |
BR8401869A (en) * | 1984-04-23 | 1985-11-26 | Microlab Sa | VOICE FREQUENCY REPEATER |
FR2564678B1 (en) * | 1984-05-18 | 1986-09-12 | Thomson Csf Mat Tel | SUBSCRIBER CIRCUIT LINK INTERFACE FOR TELEPHONE SWITCH |
DE4306251C1 (en) * | 1993-03-01 | 1994-06-01 | Bosch Telecom | Telecommunication system user connection line circuitry - indicates status of telephone user connection line according to call signal which switches transistor connected to operational amplifier inputs |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH586983A5 (en) * | 1974-12-23 | 1977-04-15 | Ibm | |
DE2556157C3 (en) * | 1975-12-11 | 1979-01-18 | Deutsche Telephonwerke Und Kabelindustrie Ag, 1000 Berlin | Circuit arrangement for an electronic subscriber feed |
-
1976
- 1976-12-02 DE DE19762655005 patent/DE2655005C3/en not_active Expired
-
1977
- 1977-11-18 LU LU78546A patent/LU78546A1/xx unknown
- 1977-11-24 CH CH1455077A patent/CH630209A5/en not_active IP Right Cessation
- 1977-11-29 BE BE183007A patent/BE861297A/en unknown
- 1977-11-30 IE IE242877A patent/IE45750B1/en unknown
- 1977-11-30 FR FR7736123A patent/FR2373201A1/en not_active Withdrawn
- 1977-12-01 DK DK533777A patent/DK533777A/en not_active Application Discontinuation
- 1977-12-01 IT IT3024377A patent/IT1088708B/en active
- 1977-12-01 AT AT0860777A patent/AT363523B/en not_active IP Right Cessation
- 1977-12-01 NL NL7713305A patent/NL7713305A/en not_active Application Discontinuation
- 1977-12-01 GB GB5018377A patent/GB1587868A/en not_active Expired
- 1977-12-02 SE SE7713728A patent/SE7713728L/en not_active Application Discontinuation
- 1977-12-02 CA CA292,254A patent/CA1111586A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR2373201A1 (en) | 1978-06-30 |
DE2655005A1 (en) | 1978-06-15 |
DE2655005C3 (en) | 1980-04-17 |
IT1088708B (en) | 1985-06-10 |
BE861297A (en) | 1978-03-16 |
DK533777A (en) | 1978-06-03 |
AT363523B (en) | 1981-08-10 |
CH630209A5 (en) | 1982-05-28 |
DE2655005B2 (en) | 1979-08-09 |
LU78546A1 (en) | 1978-04-13 |
IE45750B1 (en) | 1982-11-17 |
ATA860777A (en) | 1981-01-15 |
IE45750L (en) | 1978-06-02 |
CA1111586A (en) | 1981-10-27 |
NL7713305A (en) | 1978-06-06 |
GB1587868A (en) | 1981-04-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
NAV | Patent application has lapsed |
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