This is a continued lecture on Networks. Last notes and class we went over the physical and wireless transmission mediums. The way computers are connected in a Network. Analog - Continous electrical wave, normal phone lines were designed to carrry only voice transmissions this way. Digital signals come from computers, are individual electrical pulses that represent the bits grouped together in bytes.
Modems translate the digital to analog and back again.
Baseband Baseband can transmit only one signal at a time. Normal phonelines Broadband can transmit multiple signals simultaneously. DSl and Cable lines. Asynchronous vs Synchronous Asynchronous - A sending device can send at any time and the receiving device must be ready to accept. They have a start bit and a stop bit so the receiving device can determine the start and finish.