Delta Desktop Devices Phoenix Contact Delta Desktop Devices provide a high level of security and performance in a compact metal housing for desktop applications. The devices are also ideal for use in the distributor room. The desktop devices act as a firewall between office and production networks. The mGuard Delta is a reliable teleservice infrastructure in medium-scale machine building and systems manufacturing. The user can connect machines, controllers, or engineers in a secure way. Utilizing an intelligent firewall with a full scope of functions, the devices provide maximum security and ease of configuration. These Phoenix Contact devices include an SD card slot, router with NAT/1:1 NAT, and optional VPN/CIFS integrity monitoring.