BS ISO 22671:2021

This Recommended Standard defines, in an abstract manner, the Forward CLTU service in terms of: the operations necessary to provide the transfer service;the parameter data associated with each operation;the behaviors that result from the invocation of each operation; andthe relationship between, and the valid sequence of, the operations and resulting behaviors. It does not specify: individual implementations or products;the implementation of entities or interfaces within real systems;the methods or technologies required to radiate data to a spacecraft and to acquire telemetry frames from the signals received from that spacecraft for extraction of the Operational Control Field;the methods or technologies required for communications; orthe management activities necessary to schedule, configure, and control the Forward CLTU service.