ZA81422B - Telephone line feed - Google Patents

Telephone line feed

Info

Publication number
ZA81422B
ZA81422B ZA00810422A ZA81422A ZA81422B ZA 81422 B ZA81422 B ZA 81422B ZA 00810422 A ZA00810422 A ZA 00810422A ZA 81422 A ZA81422 A ZA 81422A ZA 81422 B ZA81422 B ZA 81422B
Authority
ZA
South Africa
Prior art keywords
telephone line
line feed
feed
telephone
line
Prior art date
Application number
ZA00810422A
Other languages
English (en)
Inventor
Anthony W Sweet
Michael P Dyer
Original Assignee
Standard Telephones Cables Ltd
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 Standard Telephones Cables Ltd filed Critical Standard Telephones Cables Ltd
Publication of ZA81422B publication Critical patent/ZA81422B/xx

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
    • H04M19/008—Using DC/DC converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)
ZA00810422A 1980-02-14 1981-01-21 Telephone line feed ZA81422B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8005000A GB2071461B (en) 1980-02-14 1980-02-14 Telephone line feed

Publications (1)

Publication Number Publication Date
ZA81422B true ZA81422B (en) 1982-02-24

Family

ID=10511353

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA00810422A ZA81422B (en) 1980-02-14 1981-01-21 Telephone line feed

Country Status (15)

Country Link
US (1) US4357495A (xx)
JP (1) JPS56129471A (xx)
AU (1) AU541309B2 (xx)
BE (1) BE887484A (xx)
CA (1) CA1164592A (xx)
CH (1) CH652882A5 (xx)
DE (1) DE3042608C2 (xx)
EG (1) EG14825A (xx)
FR (1) FR2476416A1 (xx)
GB (1) GB2071461B (xx)
IE (1) IE51190B1 (xx)
IT (1) IT1135449B (xx)
NZ (1) NZ196145A (xx)
PT (1) PT72504B (xx)
ZA (1) ZA81422B (xx)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4433215A (en) * 1979-02-26 1984-02-21 Tii Corporation Solid state hybrid circuits
US4458112A (en) * 1981-10-29 1984-07-03 Telefonaktiebolaget L M Ericsson Floating subscriber loop interface circuit
GB2132451A (en) * 1982-12-08 1984-07-04 Racal Res Ltd Radio communications systems
JPS59125157A (ja) * 1982-12-30 1984-07-19 Fujitsu Ltd 給電回路
US4595803A (en) * 1984-02-02 1986-06-17 The United States Of America As Represented By The United States Department Of Energy Bidirectional amplifier
US4674119A (en) * 1984-04-10 1987-06-16 Itt Corporation Wide-band high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry
DE3586696T2 (de) * 1984-05-30 1993-04-01 Hitachi Ltd Pcm-coder/decoder mit zweidraht/vierdrahtumwandlung.
CA1240088A (en) * 1985-11-20 1988-08-02 Mitel Corporation Solid state trunk circuit
US5038375A (en) * 1989-06-23 1991-08-06 Aptek Technologies, Inc. Circuit arrangement for preventing gain from responding to frequency variation despite the presence of an isolation transformer
SE465799B (sv) * 1990-03-15 1991-10-28 Ericsson Telefon Ab L M Anordning foer reducerad effektmatning till en abonnentlinje
US5249225A (en) * 1991-10-25 1993-09-28 Coherent Communications Systems Corp. Self-balancing hybrid using digitally programmable attenuator for variable impedance elements
GB2315188B (en) * 1996-07-09 1999-04-14 Telspec Plc Power supply system for telephone line wires
EP1213907B1 (en) * 2000-12-11 2011-05-18 Texas Instruments Inc. switched mode current feed methods for telephony subcriber loops
US7003102B2 (en) * 2001-10-10 2006-02-21 Pulse Engineering, Inc. Telecommunications gateway and method
DE102007029526A1 (de) * 2007-06-25 2009-01-15 Sitronic Gesellschaft für elektrotechnische Ausrüstung mbH. & Co. KG Elektronisches Modul und Anordnung zur Signalübertragung damit

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870896A (en) * 1972-10-30 1975-03-11 Lorain Prod Corp Controllable current source
JPS5098212A (xx) * 1973-12-26 1975-08-05
US4048552A (en) * 1976-02-12 1977-09-13 Bell Telephone Laboratories, Incorporated Digitally regulated inverter
JPS5389306A (en) * 1977-01-17 1978-08-05 Hitachi Ltd Dc current supplying circuit
NL7802423A (nl) * 1978-03-06 1979-09-10 Philips Nv Voedingsinrichting voor een lijnstroomloop.
US4176255A (en) * 1978-03-24 1979-11-27 Bell Telephone Laboratories, Incorporated Adjustable impedance battery feed circuit
US4254305A (en) * 1979-02-07 1981-03-03 International Telephone And Telegraph Corporation Current limited subscriber line feed circuit

Also Published As

Publication number Publication date
US4357495A (en) 1982-11-02
GB2071461B (en) 1984-01-25
DE3042608A1 (de) 1982-02-04
AU541309B2 (en) 1985-01-03
IE51190B1 (en) 1986-10-29
PT72504B (en) 1982-03-09
FR2476416A1 (fr) 1981-08-21
EG14825A (en) 1985-03-31
IT8119709A0 (it) 1981-02-13
NZ196145A (en) 1984-12-14
DE3042608C2 (de) 1983-03-31
BE887484A (fr) 1981-08-12
CH652882A5 (de) 1985-11-29
IT1135449B (it) 1986-08-20
AU6716081A (en) 1981-08-20
CA1164592A (en) 1984-03-27
PT72504A (en) 1981-03-01
JPS56129471A (en) 1981-10-09
GB2071461A (en) 1981-09-16
IE810289L (en) 1981-08-14
FR2476416B1 (xx) 1984-12-28

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