GB1537557A - Telegraph transmission - Google Patents

Telegraph transmission

Info

Publication number
GB1537557A
GB1537557A GB3506976A GB3506976A GB1537557A GB 1537557 A GB1537557 A GB 1537557A GB 3506976 A GB3506976 A GB 3506976A GB 3506976 A GB3506976 A GB 3506976A GB 1537557 A GB1537557 A GB 1537557A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
filter
shown
telegraph
amplifier
levels
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
GB3506976A
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.)
NOLTON COMMUNICATIONS Ltd
Original Assignee
NOLTON COMMUNICATIONS 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

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; Arrangements for supplying electrical power along data transmission lines
    • H04L25/0264Arrangements for coupling to transmission lines
    • H04L25/0266Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
    • H04L25/0268Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling with modulation and subsequent demodulation

Abstract

1537557 Telegraphy NOLTON COMMUNICATIONS Ltd 23 Nov 1977 [23 Aug 1976] 35069/76 Heading H4P A telegraph (telex) transmitter incorporates a known optical coupler 12 (LED-phototransistor) to isolate telegraph apparatus (not shown) operating at voltage levels 0, 12 V. from the line levels Π85 V. Bootstrap integrator 14, R5-R7, Cl, C2, acts as a second order Butterworth filter to control pulse flank slope to give trapezoidal pulses. An amplifier comprising a push-pull phase splitter and driver stage follows the filter. A buffer amplifier (not shown) may be interposed between the coupler, and filter. The input signal is of bipolar rectangular form. The arrangement shown is intended to replace a relay/filter isolator circuit, and may be encapsulated. The amplifier may incorporate negative feedback (not shown).
GB3506976A 1977-11-23 1977-11-23 Telegraph transmission Expired GB1537557A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3506976A GB1537557A (en) 1977-11-23 1977-11-23 Telegraph transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3506976A GB1537557A (en) 1977-11-23 1977-11-23 Telegraph transmission

Publications (1)

Publication Number Publication Date
GB1537557A true true GB1537557A (en) 1978-12-29

Family

ID=10373433

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3506976A Expired GB1537557A (en) 1977-11-23 1977-11-23 Telegraph transmission

Country Status (1)

Country Link
GB (1) GB1537557A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019920A1 (en) * 1979-05-31 1980-12-10 The Boeing Company Digital data communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019920A1 (en) * 1979-05-31 1980-12-10 The Boeing Company Digital data communication system

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Legal Events

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