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+# Signal-to-Noise Ratio
+is defined as some variation of $$ \frac{P_{signal}}{P_{noise}} $$.
+In analog, e.g. radio voice communications, it thus describes how clearly the desired signal is distinguishable from noise/interference.
+
+In digital communications, it determines the maximum possible amount of data that can be reliably transmitted
+as stated by the Shannon-Hartley theorem.
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+# Channel access method for shared mediums