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 "Failover" model is designed for use with a PIX 515E-UR, providing a highly cost-effective, high-availability solution. It operates in hot-standby mode acting as a complete redundant system that maintains current sessions. With the same hardware configuration as the Cisco PIX 515E-UR, it delivers the ultimate in high availability for a fraction of the price.