GB1343383A - Isolation circuits for telegraphic devices - Google Patents

Isolation circuits for telegraphic devices

Info

Publication number
GB1343383A
GB1343383A GB1343383DA GB1343383A GB 1343383 A GB1343383 A GB 1343383A GB 1343383D A GB1343383D A GB 1343383DA GB 1343383 A GB1343383 A GB 1343383A
Authority
GB
United Kingdom
Prior art keywords
comparator
line
light emitting
point
additional
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
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.)
ITT Creed Ltd
Original Assignee
ITT Creed 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 ITT Creed Ltd filed Critical ITT Creed Ltd
Publication of GB1343383A publication Critical patent/GB1343383A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/26—Circuits with optical sensing means, i.e. using opto-couplers for isolation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Dc Digital Transmission (AREA)
  • Amplifiers (AREA)

Abstract

1343383 Telegraphy; isolating arrangements ITT CREED Ltd 20 July 1972 34011/72 Heading H4P An arrangement to electrically isolate a line 1, 2 from telegraphic apparatus has a light emitting element 26 coupled thereto in optical relation to a sensitive element, not shown, connected to the apparatus. Components 10, 13, 14 provide a supply to a comparator 17 receiving a stabilized potential from point 22 and a potential proportional to the line from point 21 hence at a determined relation a transistor 23 conducts and discharges a capacitor 24 through the light emitting diode 26 and current limiting resistor 25. Zener diode 16 may be replaced by a resistor equal to 15 so that the reference voltage is always half maximum signal level; a separate supply circuit may be alternatively provided for the comparator 17. In Fig. 3 (not shown) an additional and identical but reversely connected circuit provides operation on both directions of line current. In a further arrangement (Fig. 4, not shown) comparator 17 is provided with an inverse output and an additional light emitter so that light flashes are given on both positive and negative transitions of signals.
GB1343383D 1972-07-20 1972-07-20 Isolation circuits for telegraphic devices Expired GB1343383A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3401172 1972-07-20

Publications (1)

Publication Number Publication Date
GB1343383A true GB1343383A (en) 1974-01-10

Family

ID=10360258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1343383D Expired GB1343383A (en) 1972-07-20 1972-07-20 Isolation circuits for telegraphic devices

Country Status (4)

Country Link
DE (1) DE2336624A1 (en)
FR (1) FR2194088A1 (en)
GB (1) GB1343383A (en)
IT (1) IT991125B (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1290562C2 (en) * 1965-03-23 1976-09-23 Siemens AG, 1000 Berlin und 8000 München CIRCUIT ARRANGEMENT FOR TRANSFERRING DC IMPULSES
FR2146946B1 (en) * 1971-07-27 1974-03-29 Lignes Telegraph Telephon

Also Published As

Publication number Publication date
IT991125B (en) 1975-07-30
FR2194088A1 (en) 1974-02-22
DE2336624A1 (en) 1974-01-31

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee