GB2074813B - Loop detectors - Google Patents

Loop detectors

Info

Publication number
GB2074813B
GB2074813B GB8012962A GB8012962A GB2074813B GB 2074813 B GB2074813 B GB 2074813B GB 8012962 A GB8012962 A GB 8012962A GB 8012962 A GB8012962 A GB 8012962A GB 2074813 B GB2074813 B GB 2074813B
Authority
GB
United Kingdom
Prior art keywords
loop detectors
detectors
loop
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
GB8012962A
Other versions
GB2074813A (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.)
Plessey Co Ltd
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
Priority to GB8012962A priority Critical patent/GB2074813B/en
Priority to ZA00812051A priority patent/ZA812051B/en
Priority to PT72845A priority patent/PT72845B/en
Priority to NZ196834A priority patent/NZ196834A/en
Priority to IE880/81A priority patent/IE51864B1/en
Publication of GB2074813A publication Critical patent/GB2074813A/en
Application granted granted Critical
Publication of GB2074813B publication Critical patent/GB2074813B/en
Expired legal-status Critical Current

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
GB8012962A 1980-04-19 1980-04-19 Loop detectors Expired GB2074813B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB8012962A GB2074813B (en) 1980-04-19 1980-04-19 Loop detectors
ZA00812051A ZA812051B (en) 1980-04-19 1981-03-26 Electronic telecommunications dc loop signalling circuit
PT72845A PT72845B (en) 1980-04-19 1981-04-13 Electronic telecommunications dc loop signalling circuit
NZ196834A NZ196834A (en) 1980-04-19 1981-04-15 Loop signalling circuit with opto-couplers
IE880/81A IE51864B1 (en) 1980-04-19 1981-04-16 Electronic telecommunications dc loop signalling circuit

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
GB2074813A GB2074813A (en) 1981-11-04
GB2074813B true GB2074813B (en) 1984-04-18

Family

ID=10512890

Family Applications (1)

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

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
ZA812051B (en) 1982-04-28
IE51864B1 (en) 1987-04-15
PT72845B (en) 1982-06-01
GB2074813A (en) 1981-11-04
NZ196834A (en) 1984-03-16
IE810880L (en) 1981-10-19
PT72845A (en) 1981-05-01

Similar Documents

Publication Publication Date Title
JPS57128075A (en) Detector
GB2080945B (en) Intrusion detector
GB2090418B (en) Thermopile detector
GB2078047B (en) Distance detector
GB2076456B (en) Buckles
GB2087564B (en) Object detector
GB2081999B (en) Am detector
GB2067295B (en) Proximity detector
JPS5728202A (en) Position detector
DE3161173D1 (en) Pyroelectric detector
JPS57149985A (en) Compound detector
JPS56153269A (en) Detector
JPS5710432A (en) Tension detector
JPS576379A (en) Motion detector
JPS56129865A (en) Acceleration detector
JPS5770438A (en) Detector
JPS56101335A (en) Independent operation detector
JPS5770439A (en) Detector
JPS56141524A (en) Motion detector
GB2072461B (en) Loop detectors
GB2074813B (en) Loop detectors
JPS5718392A (en) Position detector
JPS57124260A (en) Phase detector
JPS56120045A (en) Detector
JPS5770440A (en) Detector

Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930419