Patent ID: 6625210
Filing Date: 2003-09-23
Classification: H04L,H04W

Abstract:
A method of setting up a call over a multiple bit-rate transmission channel between a central module and a remote module, the channel comprising at least one first transmission channel having a primary bit rate and at least one second transmission channel having a secondary bit rate, each of said first and second transmission channels being a two-way channel comprising a respective first transmission half-channel in one direction and a respective second transmission half-channel in another direction, the method comprising the steps of:setting up a call on the first transmission channel, scanning for a signal indicating a secondary bit-rate requirement, and if a signal indicating a secondary bit rate requirement is detected, bit-rate switching from said first transmission channel to the second transmission channel, the switching being undertaken at different points in time for said first transmission half-channels and said second transmission half channels.