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In this paper, a new queuing model G (General arriving) /G (General Service) /1 (One Server)/ S (Number of limited buffers ) / FCFS (First Come, First Served) is proposed for integrated service with limited buffers in loop LAN. The model is build through reconstructed probability space in discrete time. According to the imbedded Markov chain theory and the generating function, a mathematical analysis and computer simulation have been developed in this paper. The delay time of packet of the system are explicitly obtained. The results of computer simulation show their concordance with the theoretical analysis.2009 World Congress on Computer Science and Information Engineering 978-0-7695-3507-4/08 $25.00