Telemetry data are generated cyclically by the on-board software (OBS) for transmission to the ground station. They represent (a subset of) the software state of the OBS and are used on ground to reconstruct (a subset of) the software state of the OBS. Telemetry data are transmitted in frames. A telemetry frame represents the set of data that are sent by the AOCS to the ground in one telemetry transmission cycle. The telemetry stream is the data sink to which telemetry data are written. It represents the channel through which telemetry data are forwarded to the ground station.
The telemetry concept proposed by the framework assumes an application
that is organized as a collection of objects with each object potentially
capable of writing its own state to the telemetry stream. Objects that
are capable of writing their own state to telemetry are called telemeterable
objects. They are characterized by interface Telemeterable.
A telemetry manager component is responsible for managing the flow
of telemetry data.