The Common Subsystem software comprised six computer software configuration items (CSCIs). (CSCI is government jargon for a set of components that is managed, configured, and documented as a unit and allocated to a single team for development.) CSCIs are defined and described in DOD-STD-2167A [DOD, 1988], The CSCIs were identified as follows:
1. Network Architecture Services (NAS). This foundation middleware provided reusable components for network management, interprocess communications, initialization, reconfiguration, anomaly management, and instrumentation of software health, performance, and state. This CSCI was designed to be reused across all three CCPDS-R subsystems.
2. System Services (SSV). This CSCI comprised the software architecture skeleton, real-time data distribution, global data types, and the computer system operator interface.
3. Display Coordination (DCO). This CSCI comprised user interface control, display formats, and display population.
4. Test and Simulation (TAS). This CSCI comprised test scenario generation, test message injection, data recording, and scenario playback.
5. Common Mission Processing (CMP). This CSCI comprised the missile warning algorithms for radar, nuclear detonation, and satellite early warning messages.
6. Common Communications (CCO). This CSCI comprised external interfaces with other systems and message input, output, and protocol management.
Table D-l summarizes the distinguishing characteristics of each CSCI.
CD phase: 20 people
Start of FSD: 23 people
Peak staffing: 82 people
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