1. The network log, settled for now

Carl Sagan’s Contact returns one last time for this arc because the desktop’s communications problem, like the search for extraterrestrial signals, is about finding the right window, the right frequency, and the right protocol. Entries 777 through 779 wondered about pass prediction, data prioritization, adaptive link rates, relay routing, missed pass recovery, and fault tolerance. This entry closes the arc.

2. What was wondered

Three questions shaped the arc:

  • How should the desktop predict passes and prioritize data? The answer is a rolling pass schedule fed into a value-aware, deadline-aware queue. Critical telemetry and alarms go first; routine logs can wait. The plan must be recomputable as new data and passes arrive.
  • How should it adapt link rates and choose relays? The answer is adaptive modulation and coding based on measured link quality, with coordination with power and thermal budgets. Routing should choose among direct downlink and relay options based on availability, cost, latency, and data rate.
  • How should it recover from missed passes and communications faults? The answer is re-queuing, retry logic, fallback radios or antennas, persistent-fault detection, and a communications safe mode that preserves commandability.

3. The decided posture

The Resident will:

  • Maintain a rolling pass prediction model for ground stations and relay constellations.
  • Implement a dynamic data queue with value, deadline, and size attributes.
  • Use adaptive modulation and coding to maximize throughput across each pass.
  • Support hybrid direct-downlink and relay architectures.
  • Provide automatic recovery from missed passes and degraded links.
  • Define a communications safe mode that uses robust modulation and essential beacons.
  • Coordinate communications decisions with storage, power, thermal, and ADCS managers.
  • Let the next test arc prove that the communications subsystem can maintain a reliable link under realistic conditions.

4. What this changes

  • The communications wondering arc is closed.
  • The Resident has a functional model for autonomous communications management.
  • The next set of entries will test the communications subsystem under operational scenarios.