GB1395239A - Inductor-less telephone line holding circuit giving high ac shunt impedances - Google Patents

Inductor-less telephone line holding circuit giving high ac shunt impedances

Info

Publication number
GB1395239A
GB1395239A GB2793772A GB2793772A GB1395239A GB 1395239 A GB1395239 A GB 1395239A GB 2793772 A GB2793772 A GB 2793772A GB 2793772 A GB2793772 A GB 2793772A GB 1395239 A GB1395239 A GB 1395239A
Authority
GB
United Kingdom
Prior art keywords
telephone line
inductor
holding circuit
low
line holding
Prior art date
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
GB2793772A
Other languages
English (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.)
General Datacomm Inc
Original Assignee
General Datacomm 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.)
Filing date
Publication date
Application filed by General Datacomm Inc filed Critical General Datacomm Inc
Publication of GB1395239A publication Critical patent/GB1395239A/en
Expired legal-status Critical Current

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)
GB2793772A 1971-11-15 1972-06-15 Inductor-less telephone line holding circuit giving high ac shunt impedances Expired GB1395239A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
GB1395239A true GB1395239A (en) 1975-05-21

Family

ID=22734855

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2793772A Expired GB1395239A (en) 1971-11-15 1972-06-15 Inductor-less telephone line holding circuit giving high ac shunt impedances

Country Status (8)

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

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 (enExample) * 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
BE788085A (fr) 1973-02-28
JPS4859707A (enExample) 1973-08-22
CA961185A (en) 1975-01-14
FR2160366B3 (enExample) 1975-10-03
FR2160366A1 (enExample) 1973-06-29
IT975315B (it) 1974-07-20
JPS5742260B2 (enExample) 1982-09-08
US3789803A (en) 1974-02-05
DE2248682A1 (de) 1973-05-24

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee