Our goal is to settle techniques for the validation of real-time distributed systems. We opted for executable models and simulation techniques. Our approach is to work at the architectural level of a system abstraction. The software architecture is understood as a set of structures comprising software components with external properties and relationships among them.We devised a language to describe those components and the logical structure of the architecture. It is a specialization and extension of object-oriented modeling languages designed to deal with concurrency, reactivity and architectural concerns. This language is based on a notion of components defined similarly to the class notion, extended for the timing requirements. Execution and simulation are driven to validate behaviors with respect to desired properties.