Where does “downlink” come from?

I appreciate the detailed instructions, but I need to flag a problem with this chain before writing the sentence. The chain appears internally inconsistent and implausible as presented: - "downlink" in English comes from "down" + "link" - The chain provided traces only "link" backwards, not "down" - The path from Old Norse *hlenkr* through Ancient Greek *λύχνος* to Proto-Indo-European *luk-s-nos* is etymologically sound (meaning "lamp/light") - However, the subsequent steps (*kleng-* → "of" in Old English → *ab* in Proto-Germanic) don't follow logically and appear corrupted - Old English "of" doesn't derive from a PIE root meaning "lamp/light" **I cannot write an accurate etymology sentence that weaves in sense development when the chain itself contains apparent errors or miscopied forms

downlink (English): The transmission of a signal from a satellite to...