The Cisco PIX 535 Security Appliance delivers a wealth of advanced security and networking services for large enterprise and service provider networks, in a high performance, purpose-built appliance. Its highly modular three-rack unit (3RU) design supports a combination of up to fourteen 10/100 Fast Ethernet interfaces or nine Gigabit Ethernet interfaces as well as redundant power supplies, making it an ideal choice for businesses requiring the highest levels of performance, port density, reliability, and investment protection.