ZA722858B - Two-wire to four-wire conversion circuit for a data switcing centre - Google Patents
Two-wire to four-wire conversion circuit for a data switcing centreInfo
- Publication number
- ZA722858B ZA722858B ZA722858A ZA722858A ZA722858B ZA 722858 B ZA722858 B ZA 722858B ZA 722858 A ZA722858 A ZA 722858A ZA 722858 A ZA722858 A ZA 722858A ZA 722858 B ZA722858 B ZA 722858B
- Authority
- ZA
- South Africa
- Prior art keywords
- wire
- switcing
- centre
- data
- conversion circuit
- Prior art date
Links
- 238000006243 chemical reaction Methods 0.000 title 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/58—Anti-side-tone circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/20—Repeater circuits; Relay circuits
- H04L25/22—Repeaters for converting two wires to four wires; Repeaters for converting single current to double current
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR717118151A FR2138208B1 (forum.php) | 1971-05-19 | 1971-05-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA722858B true ZA722858B (en) | 1973-04-25 |
Family
ID=9077306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA722858A ZA722858B (en) | 1971-05-19 | 1972-04-28 | Two-wire to four-wire conversion circuit for a data switcing centre |
Country Status (8)
| Country | Link |
|---|---|
| BE (1) | BE783554R (forum.php) |
| CH (1) | CH586489A5 (forum.php) |
| DE (1) | DE2223861C3 (forum.php) |
| ES (1) | ES402899A1 (forum.php) |
| FR (1) | FR2138208B1 (forum.php) |
| GB (1) | GB1337101A (forum.php) |
| IT (1) | IT1001487B (forum.php) |
| ZA (1) | ZA722858B (forum.php) |
-
1971
- 1971-05-19 FR FR717118151A patent/FR2138208B1/fr not_active Expired
-
1972
- 1972-04-28 ZA ZA722858A patent/ZA722858B/xx unknown
- 1972-05-11 GB GB2213072A patent/GB1337101A/en not_active Expired
- 1972-05-16 DE DE2223861A patent/DE2223861C3/de not_active Expired
- 1972-05-16 CH CH722572A patent/CH586489A5/xx not_active IP Right Cessation
- 1972-05-16 IT IT24366/72A patent/IT1001487B/it active
- 1972-05-17 BE BE783554A patent/BE783554R/xx active
- 1972-05-18 ES ES402899A patent/ES402899A1/es not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE783554R (fr) | 1972-11-17 |
| ES402899A1 (es) | 1975-04-16 |
| DE2223861A1 (de) | 1972-12-07 |
| GB1337101A (forum.php) | 1973-11-14 |
| IT1001487B (it) | 1976-04-20 |
| DE2223861C3 (de) | 1979-01-11 |
| FR2138208B1 (forum.php) | 1973-05-11 |
| DE2223861B2 (de) | 1978-05-03 |
| FR2138208A1 (forum.php) | 1973-01-05 |
| CH586489A5 (forum.php) | 1977-03-31 |
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