POWER POINT for second Week : 03-datatransmission
Key Points (intro in chapter 3 Stallings):
* All of the forms of information (voice, data, image, video) can be represented by electromagnetic signals.
* Any electromagnetic signal, analog or digital, is made up of a number of constituent frequencies. Key parameter is bandwidth
* A major problem in designing a communication facility is transmission impairment (attenuation, distortion, delay and noise)
* The designer of a communication facility must deal with four factors: bandwidth of the signal, data rate, amount of noise or other impairments and level of error rate.