GB1471925A - Transmission line terminations - Google Patents

Transmission line terminations

Info

Publication number
GB1471925A
GB1471925A GB1576174A GB1576174A GB1471925A GB 1471925 A GB1471925 A GB 1471925A GB 1576174 A GB1576174 A GB 1576174A GB 1576174 A GB1576174 A GB 1576174A GB 1471925 A GB1471925 A GB 1471925A
Authority
GB
United Kingdom
Prior art keywords
line
diodes
transmission line
connection
terminal
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
GB1576174A
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.)
Hewlett Packard Ltd
Original Assignee
Hewlett Packard 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 Hewlett Packard Ltd filed Critical Hewlett Packard Ltd
Priority to GB1576174A priority Critical patent/GB1471925A/en
Publication of GB1471925A publication Critical patent/GB1471925A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/44—Arrangements for feeding power to a repeater along the transmission line
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/46—One-port networks
    • H03H11/48—One-port networks simulating reactances

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

1471925 Active impedances HEWLETT PACKARD Ltd 9 April 1974 15761/74 Heading H3U Line terminating circuit for connection to a transmission line to permit a D.C. to be drawn therethrough, e.g. to maintain relays establishing the connection, while providing a high A.C. load, comprises a pair of oppositely poled controllable current circuits which are connected across the line and controlled in accordance with the D.C. voltage sensed across the line. Preferably the current is drawn through the emitter collector path of a transistor 10, Fig. 1, or a Darlington pair, Fig. 3, whose base, or control input, is connected to one line terminal by a resistor 14, or 114, and decoupled to the other terminal by a capacitor 16, or 116. In the arrangement of Fig. 3 diodes 120 and 220 prevent current flow through the circuit which is connected in the wrong polarity and diodes 122 and 222 prevent breakdown of capacitors 116 and 216 if they are polarity sensitive.
GB1576174A 1974-04-09 1974-04-09 Transmission line terminations Expired GB1471925A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1576174A GB1471925A (en) 1974-04-09 1974-04-09 Transmission line terminations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1576174A GB1471925A (en) 1974-04-09 1974-04-09 Transmission line terminations

Publications (1)

Publication Number Publication Date
GB1471925A true GB1471925A (en) 1977-04-27

Family

ID=10065001

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1576174A Expired GB1471925A (en) 1974-04-09 1974-04-09 Transmission line terminations

Country Status (1)

Country Link
GB (1) GB1471925A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135854A (en) * 1983-02-10 1984-09-05 Robert James Redding Line-powered modem
EP0119422A2 (en) * 1983-02-10 1984-09-26 Robert James Redding Inductance simulation circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2135854A (en) * 1983-02-10 1984-09-05 Robert James Redding Line-powered modem
EP0119422A2 (en) * 1983-02-10 1984-09-26 Robert James Redding Inductance simulation circuit
EP0119422A3 (en) * 1983-02-10 1986-03-26 Robert James Redding Inductance simulation circuit

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Legal Events

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