Radio frequency modem and method
US4794620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1984 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Jul 6, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A radio frequency modulator/demodulator (modem) and method for receiving and transmitting data over a radio frequency data link. The modem has a transmitting section which includes a modulator which modulates a radio frequency signal in response to data provided by, for example, an associated processor. The transmitting section further includes a watchdog or enable circuit which monitors a request-to-send signal produced by the associated processor, with the request-to-send signal being present when the processor is generating data to be transmitted over the data link. The enable circuit will disable the modulator should a transmission exceed a maximum predetermined time period, thereby preventing the associated processor from monopolizing the data link in the event of a processor failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.