| 摘要 |
<p>Method and apparatus for effecting mode switching from a transmission mode to a command mode of an intelligent modem operatively coupled to a digital data device and a telephone line is disclosed. A termination of the modem's transmission mode (400) is effected after a predetermined silent time interval (406) in which no data is received from the device and prior to the transmission of additional data on the line. Operation of the modem switches to a buffer mode (410) in which data sent from the device is temporarily stored instead of being transmitted on the telephone line. If the stored data is a proper escape sequence (424) operation of the modem switches to the command mode. If a proper escape sequence is not received, operation of the modem switches to a purge mode (418) in which the stored data is transmitted on the telephone line. The apparatus comprises a data interface, a novel modem controller and a modem engine. The modem controller (20) includes the data buffer (60) for storing the data received from the digital data device (22) when operating in the buffer mode.</p> |
