Network2/Concept/Capacity
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Suppose that Alice is trying to send messages to Bob over a noisy channel like a radio link.
No matter what sort of link they possess, there are only finitely many different messages that Bob might reliably receive from Alice in a single unit of time.
This quantity is the capacity of their link. Link capacity is typically expressed in bits per second or some unit derived therefrom like Mbps (mega-bits per second).