In recent years, Carrier-Grade Open Architecture (CGOA) becomes a significant trend in telecom equipment industry. Based on this unified architecture, system, module and component manufactures produce compatible Commercial Off-The-Shelf (COTS) building blocks for telecom operators in order to deploy highly available, 99.999%, carrier-grade services. In this paper, we explain the trends of CGOA related standards and markets and introduce the technical specifications and chassis-based network protocols of the CGOA's hardware platform, AdvancedTCA. The technical roadmap of CGOA industry in the future will be explored in the last section.