LU78745A1 - - Google Patents
Info
- Publication number
- LU78745A1 LU78745A1 LU78745A LU78745A LU78745A1 LU 78745 A1 LU78745 A1 LU 78745A1 LU 78745 A LU78745 A LU 78745A LU 78745 A LU78745 A LU 78745A LU 78745 A1 LU78745 A1 LU 78745A1
- Authority
- LU
- Luxembourg
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J1/00—Frequency-division multiplex systems
- H04J1/02—Details
- H04J1/14—Arrangements providing for calling or supervisory signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
- H04Q5/24—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange for two-party-line systems
- H04Q5/245—Circuit arrangements in which for one subscriber low frequency speech and/or signalling signals proceed on the line, while for the other subscriber the low frequency speech and/or signalling signals are modulated upon a high frequency carrier signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Telephonic Communication Services (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7639412A FR2408956A1 (fr) | 1976-12-29 | 1976-12-29 | Dispositif pour l'emission d'un signal basse frequence de tension elevee par l'intermediaire d'une liaison a courants porteurs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU78745A1 true LU78745A1 (de) | 1978-07-14 |
Family
ID=9181669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU78745A LU78745A1 (de) | 1976-12-29 | 1977-12-22 |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US4197433A (de) |
| BE (1) | BE861736A (de) |
| CA (1) | CA1076724A (de) |
| DE (1) | DE2757437C2 (de) |
| FR (1) | FR2408956A1 (de) |
| GB (1) | GB1526619A (de) |
| IE (1) | IE45880B1 (de) |
| IT (1) | IT1088940B (de) |
| LU (1) | LU78745A1 (de) |
| NL (1) | NL7714452A (de) |
| ZA (1) | ZA774771B (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4361731A (en) * | 1981-02-13 | 1982-11-30 | Bell Telephone Laboratories, Incorporated | Coin telephone control circuit |
| DE69940348D1 (de) * | 1999-11-19 | 2009-03-12 | Alcatel Lucent | Telefonsystem, zentrale Vermittlungsstelle und Trennvorrichtung für analoge Telefonsignalen und digitale Datensignalen |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2837605A (en) * | 1955-02-28 | 1958-06-03 | Bell Telephone Labor Inc | Subscriber-loop carrier telephone ringing systems |
| US3886321A (en) * | 1973-11-05 | 1975-05-27 | Seismograph Service Corp | Ringing generator for telephone station terminal |
| US3927266A (en) * | 1974-01-16 | 1975-12-16 | Gte Automatic Electric Lab Inc | Ringer power generator circuit for subscriber carrier station terminal |
-
1976
- 1976-12-29 FR FR7639412A patent/FR2408956A1/fr active Granted
-
1977
- 1977-08-08 GB GB33102/77A patent/GB1526619A/en not_active Expired
- 1977-08-08 ZA ZA00774771A patent/ZA774771B/xx unknown
- 1977-12-12 BE BE1008578A patent/BE861736A/xx not_active IP Right Cessation
- 1977-12-22 DE DE2757437A patent/DE2757437C2/de not_active Expired
- 1977-12-22 LU LU78745A patent/LU78745A1/xx unknown
- 1977-12-23 IT IT31258/77A patent/IT1088940B/it active
- 1977-12-27 NL NL7714452A patent/NL7714452A/xx not_active Application Discontinuation
- 1977-12-28 CA CA293,958A patent/CA1076724A/fr not_active Expired
- 1977-12-29 IE IE2637/77A patent/IE45880B1/en unknown
- 1977-12-29 US US05/865,554 patent/US4197433A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| IT1088940B (it) | 1985-06-10 |
| NL7714452A (nl) | 1978-07-03 |
| BE861736A (fr) | 1978-06-12 |
| ZA774771B (en) | 1978-06-28 |
| DE2757437C2 (de) | 1986-12-11 |
| DE2757437A1 (de) | 1978-07-06 |
| US4197433A (en) | 1980-04-08 |
| IE45880L (en) | 1978-06-29 |
| CA1076724A (fr) | 1980-04-29 |
| GB1526619A (en) | 1978-09-27 |
| IE45880B1 (en) | 1982-12-15 |
| FR2408956B1 (de) | 1980-04-25 |
| FR2408956A1 (fr) | 1979-06-08 |