Fig. 1
From: A network business availability modeling method based on Markov chain
Network state transition probability diagram. This figure describes the state transition probability diagram of the network. The state X(t) of the network is defined by the number of failed nodes. X(t) = j (j = 0, 1, 2, … n – k + 1) means that at moment t, j nodes of the network have failed and are waiting to be repaired. The λ and μ are the parameters of exponential distributions that the node life and the node repair time obey, respectively