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In this letter we study the performance of wireless sensor networks in Rayleigh fading channel, transmitted power of every sensor is assumed to be fixed during the packet transmission. The probability of packet loss (or instantaneous outage) and the accessibility are used as the performance measures. The accessibility is defined in this letter as the probability that the sensor having the weakest link gets successful access. Closed form mathematical representation of the performance is given without Gaussian approximation of the interference. Monte Carlo simulations are provided to validate the results.