One of the well-known brands among metropolitan area network manufacturers is Huawei. As a global leader in information and communications technology (ICT) solutions, Huawei has deep technical expertise and rich practical experience in the field of metropolitan area networks. Huawei is dedicated to promoting urban digital transformation by providing high-quality metropolitan area network solutions, including software and hardware devices, platform services, etc., in support of smart city development. Another well-known metropolitan area network manufacturer includes telecom operators such as China Telecom, China Unicom, and China Mobile. These operators have vast network infrastructure and coverage, enabling them to offer a wider coverage and more comprehensive services to metropolitan area network users. China Telecom, China Unicom, and China Mobile not only have well-equipped communication infrastructure in every corner of the city but also possess rich experience and professional teams in metropolitan area network services to provide efficient and reliable services to their customers. Optical Link Century, another renowned metropolitan area network manufacturer, has unique advantages in the wide area network field. Optical Link Century focuses on providing enterprise wide area network networking, LAN-WAN integration networking, and cloud network security integration services, offering secure, stable, fast, and efficient enterprise intelligent simplified network technology solutions and operation services to help enterprises reduce costs and increase efficiency. Leveraging its expertise and rich experience in the metropolitan area network field, Optical Link Century has served thousands of medium and large enterprise customers across various industries, helping them build digital network infrastructure and enhance network efficiency. Furthermore, Fnetlink is a new force in the metropolitan area network field, dedicated to providing metropolitan area network solutions for small and medium-sized enterprises. Fnetlink focuses on meeting the networking needs of small and medium-sized enterprises by offering customized metropolitan area network services, including network planning, deployment, management, and more, all in one-stop service. With a professional technical team and quality customer service system, Fnetlink provides the most suitable metropolitan area network solutions for its customers. In conclusion, metropolitan area network manufacturers include well-known brands such as Huawei, China Telecom, China Unicom, China Mobile, Optical Link Century, and Fnetlink. These manufacturers have their own characteristics and advantages in the metropolitan area network field, providing customers with diversified metropolitan area network solutions and driving continuous development in urban digital construction.