Which function is not typically included in the Link 16 maintenance tasks?

System upgrades are not typically included in the routine maintenance tasks for Link 16. Maintenance tasks generally focus on ensuring the operational effectiveness and reliability of the current system rather than modifying or upgrading the system itself. This includes roles such as data link management, which entails monitoring and controlling the data exchanges over the network, message routing, which concerns how messages are directed to their respective endpoints, and synchronization management, ensuring that all systems and users on the network are properly synchronized for effective communication. System upgrades, on the other hand, are usually part of broader developmental or procurement processes, which aim to enhance capabilities and are often conducted separately from day-to-day maintenance activities.