ABSTRACT
This chapter highlights the basics of electrical communication and the associated concepts of signals and systems. The scope of electrical communication covers in a global sense the totality of techniques and electrical/electronic means necessary for optimal transfer of information via a given transmission medium in the presence of possible impairments such as electrical noise. Accessing digital broadband services at home or in an office is an objective of modern telecommunications. In digital transmissions delay distortion would cause inter-symbol interference. In essence, the copper-wire transmission line is a low-pass filter and hence, the high frequency spectral components of digital pulses will be filtered out when the pulses are transmitted across these wires. The modulation of digital waveforms representing the bits of information from a personal computer is done by a modem and at the receiving end another modem converts the analog format of the signal into digital pulses.
