The FRM220-CWMD40-5561 is a compact and efficient 4-channel optical transceiver that supports both CWDM and DWDM technologies, operating at wavelengths of 1551 nm, 1571 nm, 1591 nm, and 1611 nm. Designed for high-performance data transport over long distances, it allows multiple signals to be transmitted simultaneously over a single optical fiber, enhancing bandwidth efficiency. Equipped with LC/UPC connectors, it ensures stable, low-loss connections, making it ideal for use in telecommunications, data centers, and metropolitan area networks (MANs). This module is easy to install in compatible FRM220 systems, offering scalability and seamless integration while maximizing the capacity of existing optical infrastructure. With its robust design and versatility, the FRM220-CWMD40-5561 is an ideal solution for users seeking cost-effective, high-capacity optical networking.