DD133387A5 - Schaltungsanordnung fuer teilnehmerleitungen fuer fernsprechaemter - Google Patents
Schaltungsanordnung fuer teilnehmerleitungen fuer fernsprechaemterInfo
- Publication number
- DD133387A5 DD133387A5 DD7700202662A DD20266277A DD133387A5 DD 133387 A5 DD133387 A5 DD 133387A5 DD 7700202662 A DD7700202662 A DD 7700202662A DD 20266277 A DD20266277 A DD 20266277A DD 133387 A5 DD133387 A5 DD 133387A5
- Authority
- DD
- German Democratic Republic
- Prior art keywords
- partnership
- lines
- circuit arrangement
- telephone alarm
- alarm
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/005—Interface circuits for subscriber lines
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7638031A FR2374795A1 (fr) | 1976-12-17 | 1976-12-17 | Equipement de ligne d'abonne pour central telephonique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DD133387A5 true DD133387A5 (de) | 1978-12-27 |
Family
ID=9181173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DD7700202662A DD133387A5 (de) | 1976-12-17 | 1977-12-15 | Schaltungsanordnung fuer teilnehmerleitungen fuer fernsprechaemter |
Country Status (17)
| Country | Link |
|---|---|
| US (1) | US4119806A (sv) |
| JP (1) | JPS5376605A (sv) |
| AR (1) | AR214764A1 (sv) |
| AU (1) | AU3149977A (sv) |
| BE (1) | BE861868A (sv) |
| BR (1) | BR7708306A (sv) |
| DD (1) | DD133387A5 (sv) |
| DE (1) | DE2754995A1 (sv) |
| ES (1) | ES464741A1 (sv) |
| FR (1) | FR2374795A1 (sv) |
| GB (1) | GB1540553A (sv) |
| IT (1) | IT1090819B (sv) |
| LU (1) | LU78693A1 (sv) |
| NL (1) | NL7713209A (sv) |
| OA (1) | OA05828A (sv) |
| SE (1) | SE7714362L (sv) |
| ZA (1) | ZA777417B (sv) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5537046A (en) * | 1978-09-06 | 1980-03-14 | Nec Corp | Subscriber's circuit |
| DE2903660C3 (de) * | 1979-01-31 | 1981-12-10 | Siemens AG, 1000 Berlin und 8000 München | Belegschaltung an einer "ankommenden" c-Ader in einer Fernmeldeeinrichtung |
| WO1981000658A1 (en) * | 1979-08-31 | 1981-03-05 | Electro Med Eng Pty Ltd | Telephone line data isolator |
| US4402039A (en) * | 1981-09-03 | 1983-08-30 | Bell Telephone Laboratories, Incorporated | Telephone line circuit |
| DE3171608D1 (en) * | 1981-10-28 | 1985-09-05 | Ibm | Line circuit containing impedance adaptation means |
| US4458112A (en) * | 1981-10-29 | 1984-07-03 | Telefonaktiebolaget L M Ericsson | Floating subscriber loop interface circuit |
| US4489222A (en) * | 1982-09-13 | 1984-12-18 | The Board Of Trustees Of The Leland Stanford, Junior University | Telephone line interface |
| US4532381A (en) * | 1984-02-13 | 1985-07-30 | Northern Telecom Limited | Active impedance line feed circuit |
| US4805213A (en) * | 1987-02-13 | 1989-02-14 | Unison Technologies, Inc. | Ring detector |
| AU623968B2 (en) * | 1989-01-19 | 1992-05-28 | Fujitsu Limited | Earth detecting circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4011410A (en) * | 1973-11-13 | 1977-03-08 | Thomas Robert M | Communication system interface circuits |
-
1976
- 1976-12-17 FR FR7638031A patent/FR2374795A1/fr not_active Withdrawn
-
1977
- 1977-11-30 NL NL7713209A patent/NL7713209A/xx not_active Application Discontinuation
- 1977-12-05 ES ES464741A patent/ES464741A1/es not_active Expired
- 1977-12-06 US US05/857,901 patent/US4119806A/en not_active Expired - Lifetime
- 1977-12-09 DE DE19772754995 patent/DE2754995A1/de active Pending
- 1977-12-12 GB GB51518/77A patent/GB1540553A/en not_active Expired
- 1977-12-13 AU AU31499/77A patent/AU3149977A/en active Pending
- 1977-12-13 AR AR270343A patent/AR214764A1/es active
- 1977-12-13 ZA ZA00777417A patent/ZA777417B/xx unknown
- 1977-12-14 BR BR7708306A patent/BR7708306A/pt unknown
- 1977-12-15 DD DD7700202662A patent/DD133387A5/xx unknown
- 1977-12-15 BE BE1008583A patent/BE861868A/xx unknown
- 1977-12-15 LU LU78693A patent/LU78693A1/xx unknown
- 1977-12-16 JP JP15158477A patent/JPS5376605A/ja active Pending
- 1977-12-16 IT IT52254/77A patent/IT1090819B/it active
- 1977-12-16 SE SE7714362A patent/SE7714362L/sv unknown
- 1977-12-16 OA OA56345A patent/OA05828A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| OA05828A (fr) | 1981-05-31 |
| SE7714362L (sv) | 1978-06-18 |
| BR7708306A (pt) | 1978-09-05 |
| BE861868A (fr) | 1978-03-31 |
| ZA777417B (en) | 1978-10-25 |
| LU78693A1 (sv) | 1978-04-17 |
| JPS5376605A (en) | 1978-07-07 |
| AR214764A1 (es) | 1979-07-31 |
| ES464741A1 (es) | 1978-09-01 |
| GB1540553A (en) | 1979-02-14 |
| DE2754995A1 (de) | 1978-06-29 |
| NL7713209A (nl) | 1978-06-20 |
| US4119806A (en) | 1978-10-10 |
| IT1090819B (it) | 1985-06-26 |
| FR2374795A1 (fr) | 1978-07-13 |
| AU3149977A (en) | 1979-06-21 |
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