GB1437032A - Power feed and bidirectional signalling arrangement - Google Patents

Power feed and bidirectional signalling arrangement

Info

Publication number
GB1437032A
GB1437032A GB1303974A GB1303974A GB1437032A GB 1437032 A GB1437032 A GB 1437032A GB 1303974 A GB1303974 A GB 1303974A GB 1303974 A GB1303974 A GB 1303974A GB 1437032 A GB1437032 A GB 1437032A
Authority
GB
United Kingdom
Prior art keywords
line
voltage
current
station
balanced
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
GB1303974A
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 GB1303974A priority Critical patent/GB1437032A/en
Publication of GB1437032A publication Critical patent/GB1437032A/en
Priority to KE276977A priority patent/KE2769A/en
Priority to MY7800010A priority patent/MY7800010A/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

Abstract

1437032 Automatic exchange system PLESSEY CO Ltd 18 March 1974 [4 April 1973] 13039/74 Divided out of 1437031 Heading H4K A bidirectional signalling arrangement on a two-wire power-feeding subscriber line comprises a constant voltage source VL at one end of the line, a balanced modulator 3 for modulating the line voltage with (binary) data signals which are to be transmitted from station 1 to station 2, a series connected voltage regulator 6 at the other end of the line for supplying a stabilized voltage to a threshold detector 4 which is capacitor coupled to the line, so as to detect the incoming voltage modulations and to a current modulator 7 which modulates the series D.C. line current with data signals which are to be transmitted to station 1. In the latter, the current variations appear as voltage changes across series resistors RD and these are detected in a capacitively coupled balanced threshold detector 9. All the devices shown use conventional transistor circuits which are described with reference to Figs. 2-5, not shown. The balanced circuits overcome longitudinal current problems.
GB1303974A 1973-04-04 1973-04-04 Power feed and bidirectional signalling arrangement Expired GB1437032A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1303974A GB1437032A (en) 1973-04-04 1973-04-04 Power feed and bidirectional signalling arrangement
KE276977A KE2769A (en) 1973-04-04 1977-09-01 A power feed and bidirectional signalling arrangement
MY7800010A MY7800010A (en) 1973-04-04 1978-12-31 A power feed and bidirectional signalling arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1303974A GB1437032A (en) 1973-04-04 1973-04-04 Power feed and bidirectional signalling arrangement

Publications (1)

Publication Number Publication Date
GB1437032A true GB1437032A (en) 1976-05-26

Family

ID=10015694

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1303974A Expired GB1437032A (en) 1973-04-04 1973-04-04 Power feed and bidirectional signalling arrangement

Country Status (2)

Country Link
GB (1) GB1437032A (en)
MY (1) MY7800010A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4211895A (en) * 1976-12-10 1980-07-08 Plessey Canada Ltd. Electronic telephone system with time division multiplexed signalling
FR2518858A1 (en) * 1981-12-23 1983-06-24 Jeumont Schneider DEVICE FOR TRANSMITTING SIGNALS ON A LINE ALSO PROVIDING A CONTINUOUS VOLTAGE SUPPLY
US4716584A (en) * 1985-05-24 1987-12-29 Nec Corporation Noise-free terminal station compatible with existing master stations
US4739205A (en) * 1986-02-24 1988-04-19 Rockwell International Corporation Telephone signal multiplexing system
US20190095378A1 (en) * 2017-09-22 2019-03-28 Zodiac Pool Systems Llc Select communications and data aspects of pool and spa equipment such as salt-water chlorinators

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4211895A (en) * 1976-12-10 1980-07-08 Plessey Canada Ltd. Electronic telephone system with time division multiplexed signalling
FR2518858A1 (en) * 1981-12-23 1983-06-24 Jeumont Schneider DEVICE FOR TRANSMITTING SIGNALS ON A LINE ALSO PROVIDING A CONTINUOUS VOLTAGE SUPPLY
EP0082791A1 (en) * 1981-12-23 1983-06-29 JEUMONT-SCHNEIDER Société anonyme dite: Signal transmission device over a line also assuring a D.C. current supply
US4716584A (en) * 1985-05-24 1987-12-29 Nec Corporation Noise-free terminal station compatible with existing master stations
US4739205A (en) * 1986-02-24 1988-04-19 Rockwell International Corporation Telephone signal multiplexing system
US20190095378A1 (en) * 2017-09-22 2019-03-28 Zodiac Pool Systems Llc Select communications and data aspects of pool and spa equipment such as salt-water chlorinators
WO2019060134A1 (en) * 2017-09-22 2019-03-28 Zodiac Pool Systems Llc Select communications and data aspects of pool and spa equipment such as salt-water chlorinators

Also Published As

Publication number Publication date
MY7800010A (en) 1978-12-31

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Legal Events

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