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I saw the G20 Summit reference on the VISSONIC news page.

For large summit rooms, what is usually the main limitation: number of delegate units, cable distance, or language channels?
For large summit rooms, none of those three is really the limiting factor — the system is designed to scale on all of them. But if we rank the practical considerations:
Delegate units — a full digital system supports hundreds of units, so this is rarely a problem.
Language channels — the 64-channel interpreter desk covers up to 64 languages, far beyond a G20-style event.
Cable distance — handled with digital extension units and CAT5e trunk cabling.
In practice the main planning point is the number of language channels and delegate units, because those drive how many interpreter desks and units you order. Distance is solved with proper digital cabling.