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There are several inescapable facts about data communications signals that must be considered in any data communications system. Data, in the form of electromagnetic signals, must be created, sent along some kind of medium (which travels through a variety of environments) and detected at its destination. For the purposes of this document the signal is digital pulses and the medium is wire pairs. 

Digital pulses are voltages that represent binary states - ones and zeros. Voltages change from state to state, which creates rising and falling edges. The number of pulses per second (baud rate) determines how much data can be sent in a given period. 

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The transmitters, media and receivers must be able to create, transfer and detect the pulses reliably at the baud rate at which the system is operating. 
The noise picked up in transit can affect the receiver's ability to reliably detect real data. 

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