Burstable T3 is ideal for businesses which commonly need far less than a full T3/DS3 (45 mbps), but occasionally have surges in bandwidth usage which approach a full T3. Burstable T3 is efficient for these companies because they are only billed for the average bandwidth used. With burstable T3, pricing is based on the average of past transmission rates, usually at the 95th percentile. When this averaged bandwidth rate is exceeded, the bill is adjusted for that specific billing period. If a company has predictable bandwidth usage, however, then fractional t3/ds3, bonded t1, or full t3 can be more efficient.