LU72147A1 - - Google Patents
Info
- Publication number
- LU72147A1 LU72147A1 LU72147A LU72147A LU72147A1 LU 72147 A1 LU72147 A1 LU 72147A1 LU 72147 A LU72147 A LU 72147A LU 72147 A LU72147 A LU 72147A LU 72147 A1 LU72147 A1 LU 72147A1
- Authority
- LU
- Luxembourg
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
-
- 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
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
- H04Q1/448—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency with conversion of a single frequency signal into a digital signal
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Telephonic Communication Services (AREA)
- Facsimiles In General (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2415368A DE2415368B1 (de) | 1974-03-29 | 1974-03-29 | Schaltungsanordnung für Fernsprechanlagen, insbesondere Fernsprechnebenstellenanlagen, zur einwandfreien Erkennung des ankommenden Ruf wechselstromes bei ankommender Belegung einer Verbindungsleitung |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU72147A1 true LU72147A1 (en, 2012) | 1975-08-20 |
Family
ID=5911640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU72147A LU72147A1 (en, 2012) | 1974-03-29 | 1975-03-27 |
Country Status (11)
| Country | Link |
|---|---|
| AT (1) | AT334983B (en, 2012) |
| BE (1) | BE827366A (en, 2012) |
| CH (1) | CH588196A5 (en, 2012) |
| DE (1) | DE2415368B1 (en, 2012) |
| DK (1) | DK115975A (en, 2012) |
| FR (1) | FR2266392B1 (en, 2012) |
| GB (1) | GB1495994A (en, 2012) |
| IT (1) | IT1034679B (en, 2012) |
| LU (1) | LU72147A1 (en, 2012) |
| NL (1) | NL7503440A (en, 2012) |
| SE (1) | SE7503635L (en, 2012) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT380978B (de) * | 1984-04-27 | 1986-08-11 | Uher Ag | Einrichtung zur bewertung von empfangssignalen in tonfrequenz-rundsteuerempfaengern (tre) |
-
1974
- 1974-03-29 DE DE2415368A patent/DE2415368B1/de not_active Ceased
-
1975
- 1975-03-03 AT AT163075A patent/AT334983B/de not_active IP Right Cessation
- 1975-03-10 CH CH297075A patent/CH588196A5/xx not_active IP Right Cessation
- 1975-03-13 GB GB10420/75A patent/GB1495994A/en not_active Expired
- 1975-03-20 DK DK115975A patent/DK115975A/da not_active IP Right Cessation
- 1975-03-21 NL NL7503440A patent/NL7503440A/xx not_active Application Discontinuation
- 1975-03-24 FR FR7509080A patent/FR2266392B1/fr not_active Expired
- 1975-03-27 LU LU72147A patent/LU72147A1/xx unknown
- 1975-03-27 SE SE7503635A patent/SE7503635L/xx unknown
- 1975-03-28 BE BE154932A patent/BE827366A/xx unknown
- 1975-03-28 IT IT21783/75A patent/IT1034679B/it active
Also Published As
| Publication number | Publication date |
|---|---|
| FR2266392A1 (en, 2012) | 1975-10-24 |
| FR2266392B1 (en, 2012) | 1977-11-18 |
| DE2415368B1 (de) | 1975-07-03 |
| NL7503440A (nl) | 1975-10-01 |
| GB1495994A (en) | 1977-12-21 |
| ATA163075A (de) | 1976-06-15 |
| BE827366A (fr) | 1975-09-29 |
| DK115975A (en, 2012) | 1975-09-30 |
| CH588196A5 (en, 2012) | 1977-05-31 |
| IT1034679B (it) | 1979-10-10 |
| AT334983B (de) | 1977-02-10 |
| SE7503635L (en, 2012) | 1975-09-30 |