Patent ID: 6823396
Filing Date: 2004-11-23
Classification: H04M,H04W

Abstract:
A method for controlling data transmission in a wireless V.24 data transmission system operating between a data terminal and a data transmission device, the V.24 data transmission system having a first V.24 data transmission apparatus and a second V.24 data transmission apparatus interconnected via an air interface, the first V.24 data transmission apparatus being connected to the data terminal, the second V.24 data transmission apparatus being connected to the data transmission device, the data transmission device being connected to a remote data transmission device having a downstream remote data terminal, the method comprising the steps of:providing the V.24 data transmission apparatuses with time-critical control information known to the data terminal and to the data transmission device which can be changed by the user of the data terminal, wherein if the control information is unchanged, preconfiguring the control information in the V.24 data transmission apparatuses, or if the control information is changed, determining in at least one of the V.24 data transmission apparatuses the changed control information transmitted in a command data transmission mode of the data terminal, the data transmission device and the V.24 data transmission apparatuses in a command data stream from the data terminal to the data transmission device, and notifying the other V.24 data transmission apparatus of the changed control information; determining in the first V.24 data transmission apparatus, in a user data transmission mode of the data terminal, the data transmission device and the V.24 data transmission apparatuses, from a user data stream sent from the data terminal to the data transmission device, a first actual pause time of a first transmission pause of the control information which immediately precedes the transmission of a first character of a character set of the control information, and a second actual pause time of a second transmission pause of the control information which immediately follows the transmission of the last character of the character set; comparing in the first V.24 data transmission apparatus, the first actual pause time with a first nominal pause time and the second actual pause time with a second nominal pause time; transmitting in the user data transmission mode via signaling, from the first V.24 data transmission apparatus special information to the second V.24 data transmission apparatus, notification of the results of the comparison if the comparison shows that the first actual pause time is greater than or equal to the first nominal pause time or the second actual pause time is greater than or equal to the second nominal pause time; and transmitting from the second V.24 data transmission apparatus in the user data transmission mode, to the data transmission device the user data stream in which the first transmission pause, having a third actual pause time immediately precedes the transmission of the first character of the character set, and in which the third actual pause time is greater than or equal to the first nominal pause time, wherein the second transmission pause having a fourth actual pause time immediately follows transmission of the last character of a character set in which the fourth actual pause time is greater than or equal to the second nominal pause time.