Analysis of blocking probabilities in skipped gradings which are offered unbalanced traffic

A method for calculating the individual group congestion and the overall loss in a sequentially hunted skipped grading which is offered unbalanced traffic is presented. Based on Wilkinson´s equivalent random theory, the paper offers two approaches to the solution of the blocking equations, one iterative, and the other making use of Rapp´s approximations. The values produced by both are compared with those obtained from simulation for a number of different gradings.