Maintenance termination unit
US4626632A · kind A · utility
7Cited by
3References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1985 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | Jul 25, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/301
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved and simplified voltage sensitive switching unit for opening a telephone subscriber pair at the line of demarcation for purposes of conducting line tests of the pair from the telephone central office to determine the state of the line. Relatively complex prior art circuitry is replaced by a combination of inexpensive solid state devices which eliminates the need for a prior art combination of diode bridge and transistor switching network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.