Space data and information transfer systems — Space link extension (SLE) — Forward communications link transmission unit (CLTU) service specification (ISO 22671:2021)
This Recommended Standard defines, in an abstract manner, the Forward CLTU service interms of:a) the operations necessary to provide the transfer service b) the parameter data associated with each operation c) the behaviors that result from the invocation of each operation andd) the relationship between, and the valid sequence of, the operations and resultingbehaviors.It does not specify:a) individual implementations or products b) the implementation of entities or interfaces within real systems c) the methods or technologies required to radiate data to a spacecraft and to acquiretelemetry frames from the signals received from that spacecraft for extraction of theOperational Control Field d) the methods or technologies required for communications ore) the management activities necessary to schedule, configure, and control the ForwardCLTU service.
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