Data is carried through networks by signals. A signal is transmitted over a phys
ID: 3882764 • Letter: D
Question
Data is carried through networks by signals. A signal is transmitted over a physical medium according to some transmission technique(e. g., analog, digital, baseband, modulated, multiplexed, compressed, spread spectrum). Physical media include metallic cables, optical fibers, and the open air (chapter 7 in this week's reading is devoted to this topic). A transmission medium is characterized primarily by a raw bandwidth (in Hertz) and a level of "noise" that corrupts signal transmission. These 2 criteria determine basically the transmission speed in bits/sec. The speed keeps being enhanced by advanced transmission and signal processing techniques, like equalization, compression (source coding), OFDM, MIMO, code division multiplexing, and frequency hopping.
1. Discuss important issues in transmission media as well as transmission and signal processing techniques in networks. 300 Words
Explanation / Answer
Data transmission involves transfer of data from one point to another, though electrical fibers, copper wires, storage media etc. There are the means through which data is transformed from one place to another . This process is called as transmission or communication media. There are two broad categories of transmission media used in computer communications, these are
Therefore, it may be said that, although both types of transmission are necessary for quality data transmission but both types at times face various issues in doing so. The characteristics of the medium and that of the signal distinctiveness are important in determining the value of a data transmission. For guided media, the medium is more important in identifying the limitations of transmission whereas in unguided media, the bandwidth of the signal produced by the transmitting antenna is imperative than the medium in determining transmission characteristics. One very important factor among these is directionality of antennae in question. Generally, signals at lower frequencies are omni-directional in nature. As opposed to higher frequencies, directional beam is required for signal transmission.
Therefore, transmission interference, bandwith and transmission impairements are imperative and must be taken care of during media transmission.
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