Behavioral modeling, simulation and synthesis of an output queuing Batcher-Banyan ATM switch with internal speedup network .

B-ISDN is expected to support diverse applications ranging from lowest to highest bit rate communications. In this mode, information is transferred in a connection oriented fashion among communicating entities using fixed size packets know as ATM cell. The Batcher-Banyan combinational switches are one of high speed space division switches. But it finds difficulties in routing two cells with same destination thus it routes one at the cost of other. The output queues placed at the output stages of banyan can resolve above problem up to great extent .Those are equipped with an internal speed- up network and free from head of blocking problem faced in input queuing . It offers a trade-off between the hardware complexity and cell loss probability. Hence ATM switches with output queues have been selected for designing, simulation using project navigator, Active HDL tools and synthesized for target device XC3S250E-5FT256.