To execute call with the multiplex bit rate transmission channel method and bit rate switching method in order, correspond call it is conveyed with

摘要

(57) Abstract This invention following to primary bit rate and the secondary bit rate which differ respectively, central module of the type which at least includes one 1st transmission channel and one 2nd transmission channel (33) with remote module (37) with regards the method in order to set up call in between. According to this invention, the aforementioned method relation could attach the acknowledgment signal which was transmitted in setup stage of the aforementioned default during step and the specified mask period which suppose the detection of the aforementioned signal which shows step and the secondary bit rate important matter which you listen and search the signal which shows step and the secondary bit rate important matter which on the aforementioned 1st channel set up the aforementioned call with default, to the step in order the mask to do, it is something which includes with the stage in order the switching to do bit rate from aforementioned 1st primary bit rate transmission channel to aforementioned secondary bit rate transmission channel.