Adjusting data transmission rate based on received signal quality
US4606044A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1984 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Mar 5, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2213/13332
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A data transmission control system for allowing remote transceiver stations to transmit data via a telephone line or like analog transmission line through modems. When transmit and receive stations have been interconnected by a call, a training sequence for the modem is executed and, also, a test signal transmission sequence is effected to set up a data transmission rate before delivery of information. When the receive station has received test training data inclusive of a plurality of transmission rates from the transmit station, the function of the modem at the receive station is checked with respect to each of the transmission rates on a signal space diagram, thereby determining whether the receive station is capable of normally receiving data at the transmission rate. Training on the transmission rates which a modem can use is executed satisfying a predetermined protocol and without increasing the protocol time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.