GB1322216A - Line supervisory circuit - Google Patents

Line supervisory circuit

Info

Publication number
GB1322216A
GB1322216A GB3746570A GB3746570A GB1322216A GB 1322216 A GB1322216 A GB 1322216A GB 3746570 A GB3746570 A GB 3746570A GB 3746570 A GB3746570 A GB 3746570A GB 1322216 A GB1322216 A GB 1322216A
Authority
GB
United Kingdom
Prior art keywords
mvolts
detector
aug
under
resistors
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
GB3746570A
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.)
AT&T Corp
Original Assignee
Western Electric Co 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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB1322216A publication Critical patent/GB1322216A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
GB3746570A 1969-08-05 1970-08-04 Line supervisory circuit Expired GB1322216A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US84758169A 1969-08-05 1969-08-05

Publications (1)

Publication Number Publication Date
GB1322216A true GB1322216A (en) 1973-07-04

Family

ID=25300976

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3746570A Expired GB1322216A (en) 1969-08-05 1970-08-04 Line supervisory circuit

Country Status (6)

Country Link
US (1) US3622709A (enExample)
BE (1) BE754235A (enExample)
DE (1) DE2038933A1 (enExample)
FR (1) FR2057868A5 (enExample)
GB (1) GB1322216A (enExample)
NL (1) NL7011277A (enExample)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL289634A (enExample) * 1962-03-01
US3772477A (en) * 1972-07-17 1973-11-13 Bell Telephone Labor Inc Telephone dial pulse detection circuit
US3819866A (en) * 1972-12-18 1974-06-25 Bell Telephone Labor Inc Light coupled loop current detector
US3825682A (en) * 1973-06-27 1974-07-23 Rca Corp Balanced line driver, line receiver system
US3914556A (en) * 1974-06-12 1975-10-21 Itt On-hook and off-hook detector for telephone switching systems
FR2286573A1 (fr) * 1974-09-24 1976-04-23 Constr Telephoniques Circuit d'exploration pour systeme de commutation
US3939308A (en) * 1974-09-27 1976-02-17 Gte Automatic Electric (Canada) Limited Electronic side of line detector
US3999018A (en) * 1975-03-05 1976-12-21 Stromberg-Carlson Corporation Timer associated with CB relay
US4027109A (en) * 1975-06-27 1977-05-31 Smith Lloyd M Telephone call diverting system
GB1563803A (en) * 1975-11-26 1980-04-02 Post Office Telecommunications transmission and signalling curcuits
US4099032A (en) * 1977-03-25 1978-07-04 Wescom, Inc. Loop current detector
US4166931A (en) * 1978-04-24 1979-09-04 Bell Telephone Laboratories, Incorporated Miniature bridge lifter for telephone lines
CH635216A5 (de) * 1978-10-25 1983-03-15 Hansjoerg Erne Geraet zur ueberwachung des linienstromes in einer telefonleitung.
DE2850929C2 (de) * 1978-11-24 1982-06-09 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur Unterdrückung von Störspannungseinflüssen bei der Bewertung des Signalzustandes auf Übertragungsleitungen, insbesondere auf Teilnehmeranschlußleitungen in Fernsprechanlagen
JPS5637793A (en) * 1979-09-05 1981-04-11 Hitachi Ltd Loop detecting circuit
US4389543A (en) * 1980-12-18 1983-06-21 Martus Granirer Telephone-activated audio control circuit
US4454477A (en) * 1982-04-28 1984-06-12 At&T Bell Laboratories Loop current detector with threshold setting impedance
EP0201635B1 (en) * 1985-05-17 1991-12-18 BELL TELEPHONE MANUFACTURING COMPANY Naamloze Vennootschap Telecommunication line circuit
DE3525566A1 (de) * 1985-07-15 1987-01-15 Siemens Ag Schaltungsanordnung zur erkennung von erdtastenfunktionen in fernsprechvermittlungsanlagen
EP0759672A1 (en) * 1995-08-23 1997-02-26 AT&T IPM Corp. Minimally invasive current sensing circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA584209A (en) * 1955-11-03 1959-09-29 Pitlik Hillel Electronic telephone subscriber's line circuit for neutralizing the effects of longitudinal induction and longitudinal unbalance
DE1073552B (de) * 1956-12-07 1960-01-21 Western Electric Company Incor porated New York N Y (V St A) Schaltungsanordnung zur Übertragung von den Leitungszustand anzeigenden Informationen

Also Published As

Publication number Publication date
NL7011277A (enExample) 1971-02-09
DE2038933A1 (de) 1971-02-18
US3622709A (en) 1971-11-23
BE754235A (fr) 1970-12-31
FR2057868A5 (enExample) 1971-05-21

Similar Documents

Publication Publication Date Title
GB1322216A (en) Line supervisory circuit
KR900001135B1 (en) Subscriber line interface circuit
ES424390A1 (es) Una disposicion estabilizadora de corriente.
GB1204617A (en) Circuit providing a floating output
GB1233454A (enExample)
HK80589A (en) Limiter amplifier
GB1393384A (en) Amplifier circuit for transmission lines
ES353725A1 (es) Aparato telefonico con red hibrida resistiva.
GB815632A (en) Improvements in or relating to communication systems
GB1242312A (en) Improvements in or relating to telephone speech circuits
GB1162044A (en) Differential Amplifier
GB1294365A (en) Threshold circuits
GB1399399A (en) Attenuators
GB835534A (en) Improvements in or relating to symmetrical current circuits fed by direct current
GB1104103A (en) Improvements relating to data transmission apparatus
GB1395173A (en) Equalizers
US3781571A (en) Loop current detector
ES373031A1 (es) Dispositivo de perdida variable.
GB1353282A (en) Circuit for detecting signals transmitted onto a two wire line
FR2312145A1 (fr) Circuit pour servir d'interface entre deux parties d'une voie de communication
GB1243289A (en) Improvements relating to electrical networks for echo pattern generation
ES245958U (es) Disposicion de circuitos para la delimitacion de tensiones
GB1057634A (en) Circuit arrangements for the transmission of signals over an unbalanced circuit
GB1227105A (enExample)
GB897964A (en) Improvements in or relating to the reduction of crosstalk in telecommunication systems

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees