ZA832522B - A digital supervisory circuit for a telephone system - Google Patents

A digital supervisory circuit for a telephone system

Info

Publication number
ZA832522B
ZA832522B ZA832522A ZA832522A ZA832522B ZA 832522 B ZA832522 B ZA 832522B ZA 832522 A ZA832522 A ZA 832522A ZA 832522 A ZA832522 A ZA 832522A ZA 832522 B ZA832522 B ZA 832522B
Authority
ZA
South Africa
Prior art keywords
counter
logic circuit
exceeded
threshold
supervisory
Prior art date
Application number
ZA832522A
Other languages
English (en)
Inventor
William Thomas Cochran
Original Assignee
Int Standard Electric Corp
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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of ZA832522B publication Critical patent/ZA832522B/xx

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/026—Arrangements for interrupting the ringing current
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing

Landscapes

  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Selective Calling Equipment (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Telephonic Communication Services (AREA)
  • Alarm Systems (AREA)
  • Manipulation Of Pulses (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)
ZA832522A 1982-04-26 1983-04-11 A digital supervisory circuit for a telephone system ZA832522B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/371,846 US4455456A (en) 1982-04-26 1982-04-26 Digital supervisory circuit for a telephone system

Publications (1)

Publication Number Publication Date
ZA832522B true ZA832522B (en) 1984-01-25

Family

ID=23465641

Family Applications (1)

Application Number Title Priority Date Filing Date
ZA832522A ZA832522B (en) 1982-04-26 1983-04-11 A digital supervisory circuit for a telephone system

Country Status (29)

Country Link
US (1) US4455456A (de)
EP (1) EP0092807B1 (de)
JP (1) JPS58195353A (de)
KR (1) KR880001651B1 (de)
AT (1) ATE32409T1 (de)
AU (1) AU557025B2 (de)
BE (1) BE896561A (de)
BR (1) BR8302051A (de)
CA (1) CA1190678A (de)
DD (1) DD220479A5 (de)
DE (1) DE3375632D1 (de)
DK (1) DK181383A (de)
EG (1) EG15506A (de)
ES (1) ES521845A0 (de)
FI (1) FI831404L (de)
GR (1) GR78194B (de)
HU (1) HU186273B (de)
IN (1) IN157100B (de)
MA (1) MA19780A1 (de)
MX (1) MX153055A (de)
NO (1) NO831424L (de)
NZ (1) NZ203885A (de)
PH (1) PH21028A (de)
PL (1) PL241632A1 (de)
PT (1) PT76580B (de)
SU (1) SU1416065A3 (de)
TR (1) TR21788A (de)
YU (1) YU91583A (de)
ZA (1) ZA832522B (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU579749B2 (en) * 1982-03-24 1988-12-08 Alcatel Australia Limited A ring signal detector
DE3545574A1 (de) * 1985-12-21 1987-07-02 Philips Patentverwaltung Verfahren und schaltungsanordnung zur auswertung der ausgangssignale von stromflussdetektoren in fernmeldeanlagen
US4887071A (en) * 1988-08-18 1989-12-12 Siemens Transmission Systems, Inc. Digital activity loss detector
US5402482A (en) * 1991-07-08 1995-03-28 Fujitsu Limited Ring trip deciding circuit
JPH05130650A (ja) * 1991-11-07 1993-05-25 Fujitsu Ltd 有線回線におけるオンフツクトランスミツシヨン回路
JP2639304B2 (ja) * 1993-06-15 1997-08-13 日本電気株式会社 加入者回路
SE9400186D0 (sv) * 1994-01-21 1994-01-21 Ericsson Telefon Ab L M Förfarande i ett telekommunikationssystem
DE59510969D1 (de) * 1994-03-04 2004-12-30 Infineon Technologies Ag Verfahren zur störsicheren Abhebeerkennung bei Rufsignaleinspeisung in digitalen Fernsprechvermittlungseinrichtungen und Schaltungsanordnung zur Durchführung des Verfahrens
JPH08139802A (ja) * 1994-11-10 1996-05-31 Fujitsu Ltd リングトリップ判定回路
US5694465A (en) * 1995-03-16 1997-12-02 Advanced Micro Devices, Inc. Integrated ringer for short telephone lines

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3772477A (en) * 1972-07-17 1973-11-13 Bell Telephone Labor Inc Telephone dial pulse detection circuit
GB1479094A (en) * 1975-03-25 1977-07-06 Standard Telephones Cables Ltd Ring trip detectors
US4087646A (en) * 1977-01-28 1978-05-02 Bell Telephone Laboratories, Incorporated Dual mode telephone subscriber loop current detector
US4132864A (en) * 1977-04-28 1979-01-02 International Business Machines Corporation Digital measurement of the DC value in an AC signal adapted to telephone off-hook detection
IT1128374B (it) * 1980-02-19 1986-05-28 Cselt Centro Studi Lab Telecom Circuito telefonico per la generazione del ritmo di suoneria ed il riconoscimento dello sgancio
US4349703A (en) * 1980-03-31 1982-09-14 International Telephone And Telegraph Corporation Programmable ring signal generator

Also Published As

Publication number Publication date
BE896561A (fr) 1983-10-26
YU91583A (en) 1986-04-30
BR8302051A (pt) 1983-12-27
NO831424L (no) 1983-10-27
MA19780A1 (fr) 1983-12-31
JPS58195353A (ja) 1983-11-14
ATE32409T1 (de) 1988-02-15
TR21788A (tr) 1985-07-15
KR840004841A (ko) 1984-10-24
ES8404128A1 (es) 1984-04-01
FI831404L (fi) 1983-10-27
IN157100B (de) 1986-01-18
DE3375632D1 (en) 1988-03-10
KR880001651B1 (ko) 1988-09-03
AU1367783A (en) 1983-11-03
DD220479A5 (de) 1985-03-27
FI831404A0 (fi) 1983-04-25
PH21028A (en) 1987-06-30
US4455456A (en) 1984-06-19
CA1190678A (en) 1985-07-16
MX153055A (es) 1986-07-22
DK181383A (da) 1983-10-27
EP0092807A3 (en) 1985-01-09
EP0092807B1 (de) 1988-02-03
AU557025B2 (en) 1986-12-04
EP0092807A2 (de) 1983-11-02
GR78194B (de) 1984-09-26
PT76580B (en) 1985-12-16
SU1416065A3 (ru) 1988-08-07
HU186273B (en) 1985-07-29
DK181383D0 (da) 1983-04-25
ES521845A0 (es) 1984-04-01
PT76580A (en) 1983-05-01
PL241632A1 (en) 1984-03-26
EG15506A (en) 1986-09-30
NZ203885A (en) 1986-04-11

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