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The new Smart Grid communications architecture for the distribution power grid and customers needs to be reliable, effective in terms of delay, and secure. To manage reliability and latency, a novel adaptive admission control algorithm is defined for a recently proposed Smart Grid FiWi communications infrastructure. To show one of the benefits of the proposed admission control algorithm, a scenario of power blackouts during a security breach is performed with an experimental FiWi network testbed. Results show that the proposed admission control algorithm effectively controls latency and reliability in the event of power blackouts, even under a DDoS attack.