A Time Synchronization Algorithm with Delay Jitter Tolerance in Single Twisted Pair Ethernet

The single twisted pair ethernet uses one twisted pair to provide ethernet service with fast data transmission and low cost. It can reuse the cables in the field bus, such that it becomes a promising solution for connecting field devices to the industrial internet. Nevertheless, due to delay jitter generated by the relatively harsh transmission media, the accuracy of time synchronization can hardly be guaranteed in the single twisted pair ethernet. To solve this problem, in this paper, we build a testbed of single twisted pair ethernet, and analyze its performance of time synchronization. Based on the study of the delay jitter, we propose a time synchronization algorithm which uses an adaptive offset threshold to tolerate the delay jitter. Experiments are executed in the testbed to prove the effectiveness of the proposed algorithm.