Multi-speed, full duplex modem
US4691342A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 1986 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Apr 21, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/0008
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A multi-speed, full duplex modem is disclosed for transmitting and receiving analog signals over a telephone network in communication with a remote modem. The analog signals are converted to digital data for processing by a signal processor and a microcomputer. A bi-directional bus is disposed between the signal processor and the microcomputer for selectively transferring multiple bits of data in either a transmit or receive direction. One or more of the multiple bits of data are restricted to convey bus direction data in one of the transmit and receive directions, and not restricted in the other direction. The full duplex modem allows simultaneous transmission and reception of analog signals over the telephone network, at one of the multispeed data rates selected for compatability between the full duplex, multispeed modem and the remote modem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.