28.Industry Applications by John G. Webster (Editor)

By John G. Webster (Editor)

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With most applications the quality of the transmission is determined by the signal-to-noise ratio, which depends on the ACR of the channel. Figure 8 shows the improvement in attenuation, NEXT, and ACR from one cable category to the next. There are many different ways to implement balanced cables. Many abbreviations are used to identify them. Abbreviations such as UTP, STP, FTP, S/UTP, and S/FTP hide more than they tell. A cable is characterized by its electrical and mechanical characteristics and not by three or four letters, especially since these letters have a second meaning: in the United States one often uses UTP to characterize cables with an impedance of 100 , while STP means 150 .

With most applications the quality of the transmission is determined by the signal-to-noise ratio, which depends on the ACR of the channel. Figure 8 shows the improvement in attenuation, NEXT, and ACR from one cable category to the next. There are many different ways to implement balanced cables. Many abbreviations are used to identify them. Abbreviations such as UTP, STP, FTP, S/UTP, and S/FTP hide more than they tell. A cable is characterized by its electrical and mechanical characteristics and not by three or four letters, especially since these letters have a second meaning: in the United States one often uses UTP to characterize cables with an impedance of 100 , while STP means 150 .

Inner and outer conductor together provide the transmission link. As the outer conductor is part of the transmission channel, it may only be grounded at one point; otherwise the protective ground might carry currents caused by the information transfer. Such currents would cause earth potential differences and ground loops. In principle 22 BUILDING WIRING Fig. 8. Attenuation and NEXT of 100 m cable. ) Values for categories in italics are under consideration. the electromagnetic energy used for transmission is enclosed between the inner and the outer conductor.

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