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Cable Technology Feature Article

September 30, 2010

Next Generation Cable Technology Released

By Deepika Mala, TMCnet Contributor

The next generation in cable technology for high data-rate applications has been introduced by W. L. Gore & Associates. This technology includes a new differential cable design with lower SCD21 and a very high level of signal fidelity.

According to company officials, this is the only cable solution that addresses the degradation in performance caused by SCD21. This new design, engineered for InfiniBand and other high data-rate applications, has 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 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.”

Gore’s low SCD21 technology, available in cables with smaller gauge sizes, allows for very precise cancellation of signals of equal amplitude and differential polarity, with very little phase difference between the differential legs.

It has become easy for Gore to engineer the smallest, most flexible cables for high-speed data rate applications, by using proprietary materials for the cable jacket and dielectric.

Hornung also noted that, “At Gore, we continue to assess the challenges of the industry before new developments in computer technology force drastic, immediate changes in cable technology. This new SCD21 cable design is the latest development not only for the more advanced SERDES technologies and the very aggressive firmware being implemented today, but also for the emerging InfiniBand EDR applications of tomorrow.”

In technology related news, Mexus Gold U.S, a Nevada Corporation, has announced Mexus's Tug "The Caleb" is moving our 230' barge to a boat yard north of Seattle, Wash., near the Canadian-U.S. border, where the boat yard has been retained to set special Automated Cable Pulling "ACP" Equipment on the large barge with their 100-ton crane.

Deepika Mala is a contributing editor for TMCnet. To read more of her articles, please visit her columnist page.

Edited by Stefania Viscusi