Concern about transmitting raw bits over a communication channel • Bits stream: 0 and 1 • Sending 1 Receiving 1 (Not 0) • What kind of signal should represent 1 or 0 – Voltage? – Analog / Digital • Number of pins in the connector • Mechanical, Electrical
Concern about transmitting raw bits over acommunication channel• Bits stream: 0 and 1• Sending 1 Receiving 1 (Not 0)• What kind of signal should represent 1 or 0– Voltage?– Analog / Digital• Number of pins in the connector• Mechanical, Electrical