The AWACS Block 40/45 Modification 

The AWACS Block 40/45 Modification system upgrade replaces the 1970's vintage mission computer system with an open system, LAN-based architecture. It also incorporates Multi-Sensor Integration of on-board and off-board sensors into a real-time database allowing for a "single target-single track" to be displayed to the operator and transmitted to the shooter. Block 40/45 also incorporates an improved Data Link Infrastructure that decreases the latency of data link transmissions for high priority targets, thus allowing targets to be transmitted quickly to the shooter. This upgrade improves machine-to-machine interfaces that ultimately compress the kill chain timeline and postures the system to more easily integrate future modifications and support. These future modifications will support horizontal integration and network centric operations. Initial System Development and Design began in 2003.