Spectral analysis of connection utilization masking in ATM networks

“Cell injection” is a technique for masking virtual connection (VC) utilization in ATM networks from third parties by providing a constant or near-constant flow of traffic over the connection. This paper models the cell injection process as a Markov modulated Poisson process (MMPP) and discusses both the theoretical and applied aspects of the cell injection approach. Analytic results are compared with measurements of real cell-injected ATM traffic and the effects of injection on the original traffic are summarized. Second order statistics, autocorrelation and power spectral density, of the cell-injected and original streams are used compare and justify these effects. These measurements show that cell injection shifts the power in the mid and high frequency regions towards low frequency regions, which is the dominant factor in queue length distributions