Cable technology design with low SCD21, high signal fidelity
W. L. Gore and Associates’ new design in cable technology for high data-rate applications features a lower SCD21 and a high level of signal fidelity, addressing degradation in performance.
W. L. Gore and Associates introduced a new design in cable technology for high data-rate applications. This technology consists of a new differential cable design with lower SCD21 (differential-to-common-mode conversion) and a very high level of signal fidelity. Additionally, it provides the only cable solution that addresses the degradation in performance caused by SCD21, according to Gore. Engineered for InfiniBand and other high data-rate applications, this new design has reportedly yielded SCD21 values that are typically below -40 dB and consistently well below -25 dB across a 20 GHz bandwidth.
SCD21 is a differential s-parameter matrix element that represents the unwanted conversion between differential mode and common mode in a transmission line. This conversion reduces the signal’s energy in differential mode, which causes unpredictable phase delays and skin-effect losses across frequencies. In coupled differential cables, the conversion results in differential-mode jitter. If these effects are not taken into account, the signal may not be recovered. According to Russ Hornung, Gore Cable Product Manager, "In the past year, we have seen more applications employing advanced serializer/deserializer (SERDES) technologies and signal recovery processing that should include a specification for SCD21 performance; however, SCD21 currently is not addressed in most manufacturer or industry specifications. This new technology allows for faster digital data rates that can exceed 20 Gbps without signal integrity being compromised."
Available in cables with smaller gauge sizes (AWG24 to AWG32), Gore’s low SCD21 technology allows for precise cancellation of signals of equal amplitude and differential polarity, with very little phase difference between the differential legs. Using proprietary materials for the cable jacket and dielectric has enabled Gore to engineer the smallest, most flexible cables for high-speed data rate applications.
Hornung said new developments in computer technology force drastic, immediate changes in cable technology. The new SCD21 cable design helps with advanced SERDES technologies, aggressive firmware, and emerging InfiniBand EDR applications, he suggested.
W.L. Gore and Associates, Inc.
- Edited by Amanda McLeman, Control Engineering, www.controleng.com
- Events & Awards
- Magazine Archives
- Oil & Gas Engineering
- Salary Survey
- Digital Reports
- Survey Prize Winners
Annual Salary Survey
Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.
There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.
But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.
Read more: 2015 Salary Survey