BE788085A - Circuit de maintien de ligne telephonique - Google Patents

Circuit de maintien de ligne telephonique

Info

Publication number
BE788085A
BE788085A BE788085DA BE788085A BE 788085 A BE788085 A BE 788085A BE 788085D A BE788085D A BE 788085DA BE 788085 A BE788085 A BE 788085A
Authority
BE
Belgium
Prior art keywords
telephone line
maintaining circuit
line maintaining
circuit
telephone
Prior art date
Application number
Other languages
English (en)
Inventor
S J Davis
S L Domyan
Original Assignee
Gen Datacomm Ind Inc
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.)
Publication date
Publication of BE788085A publication Critical patent/BE788085A/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)
  • Devices For Supply Of Signal Current (AREA)
BE788085D 1971-11-15 Circuit de maintien de ligne telephonique BE788085A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US19878971A 1971-11-15 1971-11-15

Publications (1)

Publication Number Publication Date
BE788085A true BE788085A (fr) 1973-02-28

Family

ID=22734855

Family Applications (1)

Application Number Title Priority Date Filing Date
BE788085D BE788085A (fr) 1971-11-15 Circuit de maintien de ligne telephonique

Country Status (8)

Country Link
US (1) US3789803A (fr)
JP (1) JPS5742260B2 (fr)
BE (1) BE788085A (fr)
CA (1) CA961185A (fr)
DE (1) DE2248682A1 (fr)
FR (1) FR2160366B3 (fr)
GB (1) GB1395239A (fr)
IT (1) IT975315B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965308A (en) * 1973-07-09 1976-06-22 San/Bar Corporation Line card circuit
US4203006A (en) * 1978-04-20 1980-05-13 Prentice Corporation Direct access coupler
DE2947283B1 (de) * 1979-11-20 1981-06-11 Krone Gmbh, 1000 Berlin Verlustfreie automatische Verpolungsschutzvorrichtung
US4500754A (en) * 1981-01-15 1985-02-19 Novation, Inc. Solid state off hook phone line load
JPH0238550Y2 (fr) * 1981-03-30 1990-10-17
US4373118A (en) * 1981-06-08 1983-02-08 Bell Telephone Laboratories, Incorporated Battery feed circuit
US4644103A (en) * 1985-06-04 1987-02-17 Base Ten Systems, Inc. Tone-responsive circuit for activating an instrumentality interfacing system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3448393A (en) * 1965-07-27 1969-06-03 Foxboro Co Means for error correction
US3465259A (en) * 1966-09-27 1969-09-02 Us Army Low drift d-c operational amplifier
US3629514A (en) * 1970-02-02 1971-12-21 G T E Automatic Electric Lab I Subscriber{40 s holding circuit

Also Published As

Publication number Publication date
FR2160366B3 (fr) 1975-10-03
GB1395239A (en) 1975-05-21
FR2160366A1 (fr) 1973-06-29
CA961185A (en) 1975-01-14
US3789803A (en) 1974-02-05
DE2248682A1 (de) 1973-05-24
JPS4859707A (fr) 1973-08-22
IT975315B (it) 1974-07-20
JPS5742260B2 (fr) 1982-09-08

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