BRI (Basic Rate Interface) represents the user with 2 channels of 64Kbps each for the data transmission (B channel) and one channel of 16 Kbps for the service information transmission (D-channel). Total speed of the interface BRI for the user is 144 Kbps. The common speed in view of the service information is 192 Kbps. However, BRI does not only support the circuit 2B + D, but also B + D or even D.
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