The QSFP-DD (Quad Small Form-Factor Pluggable Double Density) module has a total of 8 electrical lanes. Each lane supports independent data transmission, contributing to the module's increased data capacity.

The "Quad" in QSFP-DD denotes four independent channels, and the "Double Density" indicates an increased number of lanes compared to previous QSFP modules. QSFP-DD is designed to support higher data rates, including 200 Gigabit Ethernet (200GbE) and 400 Gigabit Ethernet (400GbE), by doubling the number of electrical lanes compared to QSFP28 (which has 4 lanes).

In the QSFP-DD module, each of the 8 lanes can operate at data rates of 25 Gbps or higher, depending on the specific implementation and standard. The increased lane count is a key feature enabling the higher data rates and improved performance in next-generation data center and networking applications.