GB549948A - Carrier frequency telephone system - Google Patents

Carrier frequency telephone system

Info

Publication number
GB549948A
GB549948A GB4071/42A GB407142A GB549948A GB 549948 A GB549948 A GB 549948A GB 4071/42 A GB4071/42 A GB 4071/42A GB 407142 A GB407142 A GB 407142A GB 549948 A GB549948 A GB 549948A
Authority
GB
United Kingdom
Prior art keywords
line
stations
phase
networks
carrier
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
GB4071/42A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB549948A publication Critical patent/GB549948A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5429—Applications for powerline communications
    • H04B2203/5437—Wired telephone

Abstract

549,948. Carrier telephony particularly over power lines. STANDARD TELEPHONES & CABLES, Ltd. March 27, 1942, No. 4071. Convention date, Oct. 22, 1940. [Class 40 (iv)] A system of carrier telephony particularly over a power line PL employs a single carrier source 40 which may be located at one of the stations, for example the central station CO, or connected to the line at any suitable point. and to avoid differences of phase at stations remote from the source, the transmission is either restricted to a single side-band or if both side-bands are used those stations are provided with phase-correcting networks. If communication between the out-stations is desired, the networks should be adjustable in accordance with the various lengths of line that may be involved. Each station is provided with a rectifier-bridge 20 for modulation and demodulation and is connected to the line PL through a filter 32, phase-correcting network if required, transformer 34 and condenser 36, one wire of the line being grounded. Calling current is generated by an interrupter 30 under the control of a key 28 and is amplified to operate the bells 24 and a lamp 52 at the central station CO. The latter is provided with a jack 44 for interconnection with an extraneous system.
GB4071/42A 1940-10-22 1942-03-27 Carrier frequency telephone system Expired GB549948A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US362244A US2264396A (en) 1940-10-22 1940-10-22 Power line carrier frequency telephone system

Publications (1)

Publication Number Publication Date
GB549948A true GB549948A (en) 1942-12-15

Family

ID=23425300

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4071/42A Expired GB549948A (en) 1940-10-22 1942-03-27 Carrier frequency telephone system

Country Status (2)

Country Link
US (1) US2264396A (en)
GB (1) GB549948A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120046A (en) * 1982-04-22 1983-11-23 Western Electric Co Intercommunication system
US5852785A (en) 1993-03-22 1998-12-22 Bartholomew; David B. Secure access telephone extension system and method in a cordless telephone system
US5970127A (en) 1997-10-16 1999-10-19 Phonex Corporation Caller identification system for wireless phone jacks and wireless modem jacks
US6055435A (en) 1997-10-16 2000-04-25 Phonex Corporation Wireless telephone connection surge suppressor

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR908688A (en) * 1942-02-20 1946-04-16 Constr Telephoniques High frequency traffic system on power transmission lines
US2535906A (en) * 1946-06-06 1950-12-26 Dillon & Co W C Carrier wave communication system
NL93838C (en) * 1953-02-18
US5554968A (en) * 1994-08-22 1996-09-10 Lee; Raymond Data communication using power lines
US6480510B1 (en) 1998-07-28 2002-11-12 Serconet Ltd. Local area network of serial intelligent cells
US6549616B1 (en) 2000-03-20 2003-04-15 Serconet Ltd. Telephone outlet for implementing a local area network over telephone lines and a local area network using such outlets
IL135744A (en) 2000-04-18 2008-08-07 Mosaid Technologies Inc Telephone communication system over a single telephone line
US6842459B1 (en) 2000-04-19 2005-01-11 Serconet Ltd. Network combining wired and non-wired segments
US6492897B1 (en) 2000-08-04 2002-12-10 Richard A. Mowery, Jr. System for coupling wireless signals to and from a power transmission line communication system
IL144158A (en) 2001-07-05 2011-06-30 Mosaid Technologies Inc Outlet for connecting an analog telephone set to a digital data network carrying voice signals in digital form
EP2523358A3 (en) 2001-10-11 2012-11-21 Mosaid Technologies Incorporated Outlet with analog signal adapter
IL154921A (en) 2003-03-13 2011-02-28 Mosaid Technologies Inc Telephone system having multiple distinct sources and accessories therefor
IL159838A0 (en) 2004-01-13 2004-06-20 Yehuda Binder Information device
US7873058B2 (en) 2004-11-08 2011-01-18 Mosaid Technologies Incorporated Outlet with analog signal adapter, a method for use thereof and a network using said outlet

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120046A (en) * 1982-04-22 1983-11-23 Western Electric Co Intercommunication system
US5852785A (en) 1993-03-22 1998-12-22 Bartholomew; David B. Secure access telephone extension system and method in a cordless telephone system
US5970127A (en) 1997-10-16 1999-10-19 Phonex Corporation Caller identification system for wireless phone jacks and wireless modem jacks
US6055435A (en) 1997-10-16 2000-04-25 Phonex Corporation Wireless telephone connection surge suppressor

Also Published As

Publication number Publication date
US2264396A (en) 1941-12-02

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