PT72845A - Electronic telecommunications dc loop signalling circuit - Google Patents

Electronic telecommunications dc loop signalling circuit

Info

Publication number
PT72845A
PT72845A PT72845A PT7284581A PT72845A PT 72845 A PT72845 A PT 72845A PT 72845 A PT72845 A PT 72845A PT 7284581 A PT7284581 A PT 7284581A PT 72845 A PT72845 A PT 72845A
Authority
PT
Portugal
Prior art keywords
signalling circuit
electronic telecommunications
loop signalling
loop
telecommunications
Prior art date
Application number
PT72845A
Other languages
Portuguese (pt)
Other versions
PT72845B (en
Original Assignee
Plessey Co 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Publication of PT72845A publication Critical patent/PT72845A/en
Publication of PT72845B publication Critical patent/PT72845B/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Photoreceptors In Electrophotography (AREA)
PT72845A 1980-04-19 1981-04-13 Electronic telecommunications dc loop signalling circuit PT72845B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8012962A GB2074813B (en) 1980-04-19 1980-04-19 Loop detectors

Publications (2)

Publication Number Publication Date
PT72845A true PT72845A (en) 1981-05-01
PT72845B PT72845B (en) 1982-06-01

Family

ID=10512890

Family Applications (1)

Application Number Title Priority Date Filing Date
PT72845A PT72845B (en) 1980-04-19 1981-04-13 Electronic telecommunications dc loop signalling circuit

Country Status (5)

Country Link
GB (1) GB2074813B (en)
IE (1) IE51864B1 (en)
NZ (1) NZ196834A (en)
PT (1) PT72845B (en)
ZA (1) ZA812051B (en)

Also Published As

Publication number Publication date
GB2074813B (en) 1984-04-18
NZ196834A (en) 1984-03-16
IE51864B1 (en) 1987-04-15
PT72845B (en) 1982-06-01
GB2074813A (en) 1981-11-04
IE810880L (en) 1981-10-19
ZA812051B (en) 1982-04-28

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