TELE-TRAFFIC ANALYSIS OF ALL-OPTICAL PACKET/ BURST SWITCHED NODES

The blocking behavior of an asynchronous all-optical OBS/OPS node with shared wavelength converters has been successfully analyzed using classical Tele-traffic models. It has been proved that the Engset traffic model with modification in off time of an on-off traffic source is more realistic for analysis of such a system. It has been shown that the degree of conversion affects the blocking behavior of an optical packet/burst switched node which is not ignorable especially when the switching node under consideration is of medium or small port count. To be exact, continuous time Markov chains have been used. The important quantitative measures which are the time, call and traffic blocking have been evaluated and compared. Additionally, we have compared two approaches: 1) using pure Engset traffic source which assumes a lost packet/burst to be immediately removed from the system, 2) using modified Engset traffic source where the more realistic behavior is assumed that the lost packet/burst is to be dumped at the node which takes finite time and during this time source cannot generate more packets/bursts. The work done here will contribute to the Tele-traffic analysis of all-optical burst/packet switched nodes.