With the scale characteristics of real network traffic, a theoretical derivation of critical time scale(CTS) based on FBM model was presented, and it was found that the performance is not only related to the correlation but the network environment (such as buffer size, utilization and so on). At the same time, a novel depict method of traffic performance in CTS and wavelet transform was proposed. The numerical simulation was in agreement with the fact, which could be explained by the phenomena of resetting effect and truncating effect of the limited buffer.
