Bit rate interface is another name for basic rate interface, or BRI. BRI is used in ISDN configurations for voice-grade telephone operations.

Basically the baud rate can never be greater than the bit rate. Baud rate can only be equal or less than the bit rate. However, there are instances that baud rate maybe greater than the bit rate. In Return-to-zero or Manchester encoding, where there are two signaling elements, the baud rate is twice the bit rate and therefore requires more bandwidth.

bit rate is half the baud rate

Bit rate is related to the maximum frequency being sent over a channel; it is roughly twice this maximum frequency.

Bit period is the time it takes to send a bit; it is 2/(bit rate).

baud rate is the rate of symbol changes...symbol can be of 1 bit, 2 bit , 3 bit etc.... Where as frequency is the inverse of rate of lowest unit in a digital transimission...