Method and apparatus of operating data communications equipment in command mode and autobauding

摘要

A modem (20) receiving high speed digital data from data terminal equipment (10). The modem operates in a "software UART" state when in command mode. A high speed clock (30) is used to continually take samples of an incoming signal from a DTE (10). A microprocessor (40) multitasks between analyzing the samples taken from the incoming signal and generating output signals to be sent to the DTE (10). The high speed clock is adjustable, setting the sample rate to be a integer multiple of at least eight times all the possible bit rates of the incoming signal. This permits quicker autobauding. Commands and prefixes can be received and detected simultaneously with the transmission of result codes to previous commands.