The Alveo U50/U50 LV card comes with a single 4-lane QSFP28 (U50 production) that can electrically accept modules up to 5W. The QSFP28 can connect interfaces up to 100G using optical modules or cables. The QSFP case temperature must be less than 85°C for class 3 optical modules (< 2.5W), and less than 70°C for class 4 optical modules (< 3.5W). The user needs to provide sufficient airflow and ambient temperature to ensure the optical module remains within the manufacturer's specification. A 161.1328125 MHz clock is provided to the QSFP28 interface such that different Ethernet IP cores can be enabled. Multiple I/O brackets are shipped with the U50/U50 LV card, and the correct bracket can be attached to the card to match the panel interface size of the server slot. For the latest information about platform support for these connectors, see Vitis Unified Software Platform Documentation: Application Acceleration Development (UG1393).