An ATM network uses a token bucket scheme for traffic shaping. A new token is put into the bucket every 5 microseconds. What is the maximum substantial net data rate (excluding the header bits)?

This is the right answer. Net token is put every 5 microseconds. Maximum output data rate = m Token arrival rate = 1/5 microsecond =>1000000/5 = 200 kbps The maximum output rate can be obtained from the following expression: C= S(m - token arrival rate), where C = bucket capacity, M = Maximum output rate, S = time for which maximum output is obtained M = C/S + token arrival rate Assume C = 1 Mbps and S = 20 msec to get: M = 1000000000/20 + (200 x 1000) M = 50.2 Mbps