The Cisco PIX 515E Firewall is an enhanced version of the widely popular Cisco PIX 515 platform, providing industry-leading stateful firewall and IP Security (IPSec) virtual private networking (VPN) services. Designed for small and medium businesses, as well as enterprise remote offices, the Cisco PIX 515E features increased processing power and integrated, hardware-based IPSec acceleration (certain models) delivering even more robust performance for high throughput security requirements.The Cisco PIX 515E is a purpose-built firewall appliance that offers an unprecedented level of protection. It is tightly integrated with the Cisco PIX Operating System (OS); a proprietary, hardened system that eliminates security holes and performance-degrading overhead typically found in general-purpose operating environments.