Switchable line powered modem
US4578533A · kind A · utility
97Cited by
18References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1984 |
| Grant date | Mar 25, 1986 |
| Priority date | — |
| Expiry date | Feb 17, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L12/10
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A modem for coupling a data terminal or other apparatus to a telephone line and deriving its operating power for both transmitting and receiving operation from the telephone line, and providing electrical isolation between the telephone line and the data terminal. The modem is switchable to provide orginate or answer operation in either of two operating frequency bands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.