Implementing a clock synchronization protocol on a multi-master Switched Ethernet network

Abstract

The interest to use Switched Ethernet technologies in real-time communication is increasing due to its absence of collisions when transmitting messages. Nevertheless, using COTS switches affect the timeliness guarantee inherent in potentially overflowing internal FIFO queues. In this paper we focus on a solution, called the FTT-SE protocol, which is developed based on a master-slave technique. Recently, an extension of the FTT-SE protocol has been proposed where the transmission of messages are controlled using multiple master nodes. In order to guarantee the correctness of the protocol, the masters should be timely synchronized. Therefore, in this paper we investigate the possibility of using a clock synchronization protocol, based on the IEEE 1588 standard, among master nodes. Moreover, we evaluate the overhead that is imposed by the clock synchronization protocol to the FTT-SE protocol. Finally, we present a formal verification of this solution by means of model checking technique to prove the correctness of the FTT-SE protocol when the clock synchronization protocol is applied.