ETU-LINK 40G QSFP+ optical module is a small form-factor pluggable optical module with four channels and a transmission rate of 40Gbps. It utilizes the QSFP+ (Quad Small Form-factor Pluggable Plus) interface, making it more suitable for applications with high port density compared to CFP optical modules. It supports a maximum transmission rate of 40 Gbps. It is commonly used in scenarios such as data centers, enterprise networks, and telecommunications networks for high-speed data transmission and communication.