GB1412420A - Signal transmission systems - Google Patents
Signal transmission systemsInfo
- Publication number
- GB1412420A GB1412420A GB666472A GB666472A GB1412420A GB 1412420 A GB1412420 A GB 1412420A GB 666472 A GB666472 A GB 666472A GB 666472 A GB666472 A GB 666472A GB 1412420 A GB1412420 A GB 1412420A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- earth
- repeaters
- balanced
- signal transmission
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Abstract
1412420 Repeater power supplies MARCONI CO Ltd 21 Dec 1972 ]12 Feb 1972] 6664/72 Heading H4R Current flowing between earth and the floating nominal earth point 40 of a balanced power supply 35A, 35B for repeaters 1-14, 16-29 is detected 41 and utilized 42 to reduce the earth current to zero whilst maintaining constant loop current to power the repeaters. Any other balanced supplies 36A, 36B have earthed centre points 38. Detected current above a threshold indicates a fault in one of the supply sections 35A, 35B.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB666472A GB1412420A (en) | 1972-02-12 | 1972-02-12 | Signal transmission systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB666472A GB1412420A (en) | 1972-02-12 | 1972-02-12 | Signal transmission systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1412420A true GB1412420A (en) | 1975-11-05 |
Family
ID=9818572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB666472A Expired GB1412420A (en) | 1972-02-12 | 1972-02-12 | Signal transmission systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1412420A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6614632B1 (en) | 1998-12-30 | 2003-09-02 | Alcatel | Powerfeed for a submarine communications system |
-
1972
- 1972-02-12 GB GB666472A patent/GB1412420A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6614632B1 (en) | 1998-12-30 | 2003-09-02 | Alcatel | Powerfeed for a submarine communications system |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |