What are the two types of Link 16 networks?

The two types of Link 16 networks are indeed classified as System Time Reference Network and External Time Reference Network. In a System Time Reference Network, the time reference is based on the network's internal system, which ensures that all participants within the network utilize a synchronized time format intrinsic to that network. This synchronization is crucial for effective communication and operational coordination.

On the other hand, the External Time Reference Network allows participants to utilize a common time reference from an external source, which can enhance interoperability in joint operations, especially when connecting different networks or systems that may not inherently share a synchronized time.

Understanding these distinctions is important for managing network operations effectively, as each type supports specific operational needs and scenarios, emphasizing the necessity of timing integrity in communication networks like Link 16.