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In this white paper:
  1. Introduction and History of Shielding
  2. Balanced Transmission
  3. Fundamentals of Noise Interference
  4. Ground Loops
  5. Design of Screens and Shields
  6. Grounding of Cabling Systems
  7. The Antenna Myth
  8. The Ground Loop Myth
  9. Conclusion - Why Use Screened/ Fully-Shielded Cabling?

Screened and Shielded Cabling - Noise Immunity, Grounding, and the Antenna Myth

Why use Screened/Fully-Shielded Cabling

The performance benefits of using screened and fully-shielded systems are numerous and include:

  1. Reduced pair-to-pair crosstalk in fully-shielded designs
  2. Reduced alien crosstalk in screened and fully-shielded designs
  3. Screened category 6A cable diameters are generally smaller than 6A UTP cables allowing greater pathway fill/utilization
  4. Substantially improved noise immunity at all frequencies and especially above 30 MHz when cable balance starts to significantly degrade
  5. Significantly increased Shannon capacity for future applications

Achievable SNR margin is dependent upon the combined properties of cabling balance and the common mode and differential mode noise immunity provided by screens and shields. Applications rely on positive SNR margin to ensure proper signal transmission and minimum BER. With the emergence of 10GBASE-T, it's become clear that the noise isolation provided by good balance alone is just barely sufficient to support transmission objectives. The alien crosstalk and noise immunity benefits provided by F/UTP and S/FTP cabling designs have been demonstrated to offer almost double the Shannon capacity and this performance advantage has caught the attention of application developers and system specifiers. It's often said that the telecommunications industry has come full circle in the specification of its preferred media type. In actuality, today's screened and fully-shielded cabling systems represent a fusion of best features of the last two generations of LAN cabling: excellent balance to protect against low frequency interference and shielding to protect against high frequency interference.