In 2024, CCSA TC6 WG1 completed the Technical Requirements for N×400G Ultra-Long-Haul WDM. This standard specifies DWDM optical systems using QPSK modulation above 120 GBd. Attract more industrial participants for FTTR applications, and promotion. Dig out the deployment requirements of FTTR Establish regular communication? Twice every year or annual workshop? When and what. CCSA is a non-profit organization for carrying out standardization activities in the field of Information and Communications Technology (ICT) across China. FTTH/O dominates, what's next ? targets for Gigabit fiber network. MSA (Multi-Source Agreement) standards define the mechanical, electrical, and management interfaces of optical transceivers, enabling multi-vendor interoperability, supply chain flexibility, and large-scale network deployment. Understanding MSA is critical for compatibility validation, cost. At present, single-wavelength 100G/200G WDM systems have been commercially deployed on a large scale in operators' backbone networks, and single-wavelength 400G systems have moved from metropolitan area networks to backbone networks, becoming the focus of attention and application in the industry. This guide provides an in-depth look at what an MSA is, why it's a critical component of the industry's ecosystem, and what it means for end-users, manufacturers, and the future of data transmission. This shift extends beyond the traditional backbone network (>1000km) to encompass metro areas.
