Abstract
This paper presents the relationship between the intensity of network damage and the network survivability. Then a method for quantitatively analyzing the survivability of tree network is studied. Based on the analysis, the survivability of Ethernet Passive Optical Network (EPON) with three kinds of protection schemes (i.e., Trunk-Fiber protection scheme, Node-Fiber protection scheme, and Bus-Fiber protection) is discussed. Following this, the comparisons of the survivability among these three kinds of protection schemes of EPON are put forward. The simulation results show that, when the coverage area is the same, the survivability of EPON with Node-Fiber protection scheme is better than that of EPON with Trunk-Fiber protection scheme, and when the number and distribution of Optical Network Unit (ONU) are the same, the survivability of EPON with Bus-Fiber protection scheme is better than that of EPON with Node-Fiber protection scheme. Under the same constraints, the needed fiber of EPON with Bus-Fiber protection scheme is the least when there are more than 12 ONU nodes. These results are useful not only for forecasting and evaluating the survivability of EPON access network, but also for its topology design.
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