The Alveo U55C card comes with a dual 4-lane QSFP28 that can accept modules up to 3.5W. The QSFP28 can connect interfaces up to 100G using optical modules or cables. A 161.1328125 MHz clock is provided to the QSFP28 interface such that different Ethernet IP cores can be enabled. The Alveo U55C card is shipped with eight unique MAC IDs. These IDs are located on a sticker on the back of the unit and can be retrieved through the card management solution IP. See the Card Management Solution Subsystem Product Guide (PG348) for more information.