The distribution of station locations in a CSMA network can have significant effect onnetwork throughput. In this paper, we develop an analytic model for unslotted, non-persistentCSMA bus network where the stations are uniformly distributed along the bus. We derive aclosod form expression for throughput approximation, and discuss the fairness of CSMAprotocol using the bus topology. Analytic and simulation results are presented and compared. The distribution of station locations in a CSMA network can have significant effect onnetwork throughput. In this paper, we develop an analytic model for unslotted, non-persistentCSMA bus network where the stations are uniformly distributed along the bus. We derive aclosod form expression for throughput approximation, and discuss the fairness of CSMA protocol using the bus topology. Analytic and simulation results are presented and compared.