Definition Uplinks pl Crossover or Relay Downlinks Rel Crosslinks Intersatellite links Relays T&C tt& c TT&C satellit TT&c Tracking, Teler and Control ind station The communications architecture consists of satellites and ground stations interconnected with communications links. (Adapted from SMAD.Definition • Uplinks • Downlinks • Crosslinks • Relays • TT & C Uplink Downlink Intersatellite links Relay satellite Relay satellite Relay satellite Sensor satellite Sensor satellite Crossover or Intersatellite links Mission data Launch phase TT&C TT&C Satellite Ground station TT&C Tracking, Telemetry and Control The communications architecture consists of satellites and ground stations interconnected with communications links. (Adapted from SMAD.)