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The QSFP-40G-ER4 is a high-performance transceiver module designed and manufactured by ETU-Link Technology Co., Ltd. This module is a cost-effective solution for extending the reach of 40Gbps networks, making it ideal for data centers and enterprise networking applications, With its compact QSFP form factor, the QSFP-40G-ER4 is easy to install and provides a reliable and high-speed connection. It is designed to deliver extended reach for up to 40km over single-mode fiber, making it suitable for long-distance transmissions, Equipped with four independent optical channels, the QSFP-40G-ER4 achieves excellent performance and reliability. It supports Digital Diagnostics Monitoring (DDM) functions for real-time monitoring of the transceiver's status, enhancing network management and maintenance, ETU-Link Technology Co., Ltd. is a trusted manufacturer of optical transceivers, and the QSFP-40G-ER4 is designed and manufactured to the highest standards, ensuring quality and reliability. With its excellent performance, compatibility, and cost-effectiveness, the QSFP-40G-ER4 is the perfect choice for high-speed data transmission requirements