Network Data Transmission PDF

2.1.1 Network Data Transmission Network data transfer works by modulating the properties of a transmission medium —electric current, infrared light, or radio waves—to encode a signal. One example of modulation is transitioning between low and high voltage states in an electrical circuit. These v...

2.1.1 Network Data Transmission Network data transfer works by modulating the properties of a transmission medium —electric current, infrared light, or radio waves—to encode a signal. One example of modulation is transitioning between low and high voltage states in an electrical circuit. These voltage pulses can encode symbols, which can be mapped to digital bits—ones and zeros. Each media type supports a range of possible frequencies. Higher frequencies allow for more data to be transferred per second. The range of frequencies is referred to as the media bandwidth. The narrow definition of bandwidth is a frequency range measured in cycles per second or Hertz (Hz), but the term is very widely used in data networking to mean the amount of data that can be transferred, measured in multiples of bits per second (bps). Encoding methods mean that, for instance, a signal with 100 MHz frequency bandwidth can transfer much more than 100 Mbps. Copyright © The Computing Technology Industry Association, Inc. All rights reserved.