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Using the TA allows the BTS to receive the bursts from a particular MS in the proper receiver window. The BTS calculates the first TA when receiving a RACH and reports the value to the BSC. TA can take any value between 0 and 63, which relates to a distance between 0 km and 35 km. The steps are about 550 m (35 km/63 = 550 m). It is important to note that this value of TA represents twice the propagation delay.