Several stability and robustness properties of control systems can be unified under the notion of dissipativity. This concept has been recently studied for network control systems with communication constraints. However, the obtained results suffer from a concrete proof of Zeno-freeness property for the sampling times. In this article, we study different forms of dissipativity property for the network-communicated physical processes. The triggering instants are also shown to guarantee the well known separation property. A comparison of the result with the existing approaches is given through a case study.