BE571163A - - Google Patents
Info
- Publication number
- BE571163A BE571163A BE571163DA BE571163A BE 571163 A BE571163 A BE 571163A BE 571163D A BE571163D A BE 571163DA BE 571163 A BE571163 A BE 571163A
- Authority
- BE
- Belgium
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/22—Arrangements for supervision, monitoring or testing
- H04M3/2272—Subscriber line supervision circuits, e.g. call detection circuits
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL835534X | 1957-09-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE571163A true BE571163A (US07122603-20061017-C00145.png) |
Family
ID=19843126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE571163D BE571163A (US07122603-20061017-C00145.png) | 1957-09-14 |
Country Status (5)
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE632293A (US07122603-20061017-C00145.png) * | 1961-03-03 | |||
| DE1157665B (de) * | 1962-04-04 | 1963-11-21 | Telefunken Patent | Schaltungsanordnung zur Pruefung des Belegungszustandes von Teilnehmerleitungen in Fernmelde-, insbesondere Fernsprechanlagen |
| DE1263865B (de) * | 1966-03-24 | 1968-03-21 | Telefunken Patent | Schaltungsanordnung zur Speisung von Fernmeldeleitungen, insbesondere von Fernsprechteilnehmerleitungen |
| US3851108A (en) * | 1972-12-20 | 1974-11-26 | Bell Lab Inc | Communication line supervisory circuit |
| US4099032A (en) * | 1977-03-25 | 1978-07-04 | Wescom, Inc. | Loop current detector |
| US4197431A (en) * | 1978-10-02 | 1980-04-08 | Digital Telephone Systems, Inc. | Subscriber loop feed apparatus |
| US4524246A (en) * | 1982-07-07 | 1985-06-18 | Harris Corporation | SLIC II--common-mode current rejection |
| US5333192A (en) * | 1990-06-26 | 1994-07-26 | Northern Telecom Limited | Line interface circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2676210A (en) * | 1948-08-11 | 1954-04-20 | Hartford Nat Bank & Trust Co | Potential comparing selector circuit |
| NL106485C (US07122603-20061017-C00145.png) * | 1955-11-03 |
-
0
- BE BE571163D patent/BE571163A/xx unknown
-
1958
- 1958-09-11 GB GB29140/58A patent/GB835534A/en not_active Expired
- 1958-09-11 DE DEN15575A patent/DE1067873B/de active Pending
- 1958-09-12 FR FR1203287D patent/FR1203287A/fr not_active Expired
- 1958-09-15 US US761220A patent/US3042816A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US3042816A (en) | 1962-07-03 |
| DE1067873B (de) | 1959-10-29 |
| FR1203287A (fr) | 1960-01-18 |
| GB835534A (en) | 1960-05-25 |
