Patent ID: 6574315
Filing Date: 2003-06-03
Classification: H04M

Abstract:
A method for controlling data transmission in a cordless V.24 data transmission system operated between a data terminal equipment unit and a data communication equipment unit for data telecommunication, the V.24 data transmission system having a first V.24 data transmission device and a second V.24 data transmission device connected to one another via an air interface, the first V.24 data transmission device being connected to the data terminal equipment unit, the second V.24 data transmission device being connected to the data communication equipment unit, and the data communication equipment unit being connected to a remote data communication equipment unit with a downstream remote data terminal equipment unit, comprising the steps of:when the terminal equipment unit, the data communication equipment unit and the V.24 data transmission devices are switched on, operating the V.24 data transmission devices, the data terminal equipment unit and the data communication equipment unit in an instruction data transmission mode; in the instruction data transmission mode, with the data terminal equipment unit, transmitting instruction data at different baud rates depending on data transmission phase; when an autobauding function is activated, with the first V.24 data transmission device detecting that instruction data have been transmitted at different baud rates or that a change in baud rate has taken place, transmitting the respective baud rate to the second V.24 data transmission device by means of signaling, and transmitting the instruction data sent by the data terminal equipment unit with the different baud rates to the second V.24 data transmission device; with the second V.24 data transmission device, setting the baud rates received from the first V.24 data transmission device in parallel with the received instruction data and transmitting the instruction data thus set to the data communication equipment unit; and when the autobauding function is activated, with the data communication equipment unit detecting that the instruction data have been transmitted at different baud rates or that a change in baud rate has taken place.