GB1480488A - Low current transmission circuits - Google Patents

Low current transmission circuits

Info

Publication number
GB1480488A
GB1480488A GB2905974A GB2905974A GB1480488A GB 1480488 A GB1480488 A GB 1480488A GB 2905974 A GB2905974 A GB 2905974A GB 2905974 A GB2905974 A GB 2905974A GB 1480488 A GB1480488 A GB 1480488A
Authority
GB
United Kingdom
Prior art keywords
line
low current
current transmission
july
transmitter
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
GB2905974A
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.)
IND D SOULE ETS
Original Assignee
IND D SOULE ETS
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 IND D SOULE ETS filed Critical IND D SOULE ETS
Publication of GB1480488A publication Critical patent/GB1480488A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/738—Interface circuits for coupling substations to external telephone lines
    • H04M1/74—Interface circuits for coupling substations to external telephone lines with means for reducing interference; with means for reducing effects due to line faults
    • H04M1/745—Protection devices or circuits for voltages surges on the line
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters

Abstract

1480488 Line protective devices ETABS INDUSTRIELS D SOULE SA 1 July 1974 [17 July 1973] 29059/74 Heading H4R In a protective device for a low current transmission circuit a transmitter 2 and receiver 15 are connected to the line 1 via respective units each incorporating a lighting protector 3, 3<SP>1</SP>, 4, or 3a, 3a<SP>1</SP>, 4a, a filter 5, 6, 7 or 5a, 6a, 7a, and a transducer assembly which provides an electromagnetic radiation coupling between the transmitter or receiver and the line. The transducer assembly can be a light emitting diode 12 or 13 and photo-sensitive transistor 11 or 14, a radio wave link, or a device including an optical fibre or laser link. Zener diodes 8 are also provided in the filter circuits.
GB2905974A 1973-07-17 1974-07-01 Low current transmission circuits Expired GB1480488A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7326131A FR2238269B1 (en) 1973-07-17 1973-07-17

Publications (1)

Publication Number Publication Date
GB1480488A true GB1480488A (en) 1977-07-20

Family

ID=9122700

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2905974A Expired GB1480488A (en) 1973-07-17 1974-07-01 Low current transmission circuits

Country Status (3)

Country Link
DE (1) DE2429688B2 (en)
FR (1) FR2238269B1 (en)
GB (1) GB1480488A (en)

Also Published As

Publication number Publication date
DE2429688B2 (en) 1976-11-11
FR2238269B1 (en) 1981-03-06
DE2429688A1 (en) 1975-01-30
FR2238269A1 (en) 1975-02-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee