CS485 Sylabus

### The Maximum data rate of a transmission medium

• Another factor that affect reception quality

• Fact:

• Beside physical constraints imposed by the property of the the transmission media, another factor that affects the quality of the received signal is:

 noise

• Maximum data rate of a transmission channel

• The factors that determine the data transmission rate over a transmission medium (from electronics):

 Bandwith of the transmission medium (i.e., the physical property)             Ambient noise

• Theoretical maximum data rate of a transmission channel: (no proof)

• Maximum data rate of a transmission medium is:

where:

 ``` C = maximum data rate (in # bits/sec) --- a.k.a. capacity B = Bandwidth of the transmission medium (in Hz) S = power of the transmited signal (in Watt) N = power of the ambient noise (in Watt) S/N is called the "Signal to Noise ratio" ```

Note:

 This famous result is derived by the late Mathematician Claude Shannon (see: click here )