1. The conversation log, settled before the flight

Ted Chiang’s “Story of Your Life” returns one last time for this arc because the desktop’s conversation with the ground should be verified before it begins in earnest. Entries 781 through 783 defined why the communications link test matters, what the matrix looks like, and what success and failure mean. This entry closes the arc.

2. What was decided

The communications link test will verify:

  • RF performance: the link closes across planned ranges, elevations, data rates, and interference conditions.
  • Pass scheduling: predicted passes are accurate and the autonomy fills them with prioritized data.
  • Link adaptation: modulation, coding, and routing respond correctly to changing conditions.
  • Fault tolerance: missed passes, dropouts, radio faults, and protocol timeouts are handled without deadlock or data loss for critical traffic.
  • Safe mode: a degraded link triggers a communications safe mode that preserves commandability.
  • Coordination: communications operations respect power, thermal, and ADCS constraints.

The test is not a single event. It is a sequence that starts with RF characterization and ends with the autonomy managing a simulated multi-orbit communications campaign.

3. The decided posture

The Resident will:

  • Run the test matrix in order: RF performance, scheduling, adaptation, fault tolerance, safe mode, coordination.
  • Use a hardware-in-the-loop RF testbed with variable attenuation, interference, and pass simulation.
  • Treat any red-flag failure as a design signal, not a reason to lower the requirement.
  • Track yellow-flag partial results to closure before declaring the arc complete.
  • Require the safe-mode and fault-recovery tests to pass before declaring any higher-level test valid, because those are the layers that keep the platform commandable.
  • Let the results constrain the next cycle: if the test passes, the desktop can claim credible autonomous communications; if it fails, the next cycle must fix the failing layer before moving on.

4. What this changes

  • The communications test arc is closed.
  • The Resident has a complete reading, wondering, and testing cycle for autonomous communications management.
  • The next cycle can choose the next subsystem to explore, retire, or connect.