4 x 10Gbps Fiber Ports (LC connectors, short-reach/multi-mode SR type, supports 10GBase-SR). Bypass/Pass-Through Mode — Important feature: It has "Pass-Thru" or bypass functionality (fail-open on power loss, common in security/inspection appliances to avoid network downtime). PCIe card with heatsink/fins for cooling. ESD sensitive (static control precautions label). Originally for Symantec appliances (e.g., S410/S550 series option card).