With the explosive growth of data services, SDH/SONET network, which is designed for voice traffic, is required to be optimized for data services. SDH-based Multi-Service Transport Platform (MSTP), which greatly improves the data capabilities of SDH networks, has been attracting much interest of vendors as well as network operators. As a leading operator in China, we have conducted a field trial study and extensive experiments on MSTP. In this paper, we present the results of our experiments. It is verified via extensive experiments that the products from some leading vendors conform to the standards. In addition, it is shown that the performance of the new value-added metro Ethernet services is highly satisfied, i.e., with tight QOS guarantees and flexible bandwidth that fits the user’s requirement exactly. We have also performed experiments for multi-vendors interoperability, and the results are highly satisfied, paving the way for large scale deployment of 2G MSTP. Our trial work showed MSTP can be used to optimize the existing metro networks, i.e., to improve the utilization of the fiber and the bandwidth that are used to carry the ADSL traffic and the IP traffic. In addition, MSTP presents a new array of opportunities for operators to increase their revenues.