Embedded communication networks are playing an increasingly important role in embedded and mission-critical systems. In this paper, a new architecture of FC-based embedded mission-critical network (FEMN) has been proposed firstly, FEMN adopt novel simplified architecture and compact signaling protocol that are different from FC standard. In the second part, paper focus on the topology survivability of embedded mission-critical network, introduce the vertex segment set to describe the amount of work done to destroy the network and how badly the network's damage is. We observe several existing parameters and introduce k-cutset tenacity to measure topology survivability of embedded mission-critical network. At last, we put forward a method to construct graph that could achieve the upper bound of k-cutset tenacity under special case.