Shielded copper cabling solutions favoured

The world’s first independent 10GBASE -T comparative study

The AmpNetconnect business unit of Tyco Electronics(TE) is one of the companies supporting the world’s first independent study of UTP (unshielded twisted pair) and STP (shielded twisted pair) systems for 10 Gigabit Ethernet (10GBASE-T) communications, which has recently been completed by third-party test laboratory GHMT AG.

Does a shielded cabling system provide better protection against Background Noise and AlienNEXT effects than an unshielded cabling system???
While this has always been the assumption of most cabling engineers around the globe, it has now been proven by this comparative live test study of the GHMT AG!

Since its establishment in 1992 as a vendor-independent and impartial test lab, GHMT AG has been concerned with the complex field of physical transmission security in networks, computer centres and industrial plants. The facility provides high-end services including analyses, expert opinions and concepts, as well as tests, expert inspections and the development of installation standards in the areas of cabling and systems, electromagnetic compatibility and wireless applications.

The first-of-a-kind comparative study, which evaluated two U/UTP and one F/UTP and two S/FTP systems from five market-leading vendors, offers conclusive proof that the ideal cabling infrastructure system to support 10GBASE-T and larger applications is shielded copper.

“With the growing demand for IP bandwidth and end-user driven broadband services for transmitting huge quantities of data or multimedia entertainment files, there is a need to guarantee the performance of high-speed communications technologies like 10 Gigabit Ethernet”, comments David Richens, Senior Systems Application Engineer for Tyco Electronics’ AmpNetconnect business unit in Britain: “For the first time, the industry now has a detailed insight into these performance aspects, backed by detailed evaluation from a world-leading independent test house.”

The tests were conducted ‘live’ using real 10GBASE-T equipment and traffic in environmental conditions established in international MICE (mechanical, ingress, chemical and electromagnetic) classifications.

The study was conducted by GHMT AG, an independent test laboratory founded in 1992. GHMT is an ISO/IEC 17025 certified third-party laboratory and one of the world’s leading cabling test houses. GHMT specialises in cabling and
systems, EMC analysis and concepts, as well as wireless applications.

Key findings in the study include the fact that 10GBASE-T is very noise sensitive because of the higher transmission frequency and lower signal levels caused by more complex coding schemes. In this context, shielded systems offer high coupling attenuation and therefore extraordinary ANEXT (alien cross-talk) and EMC performance, whereas unshielded systems show significantly weaker ANEXT performance and coupling attenuation because of balance-only based noise reduction.

In the GHMT evaluation, unshielded systems failed four out of five electromagnetic immunity tests as specified by the international MICE definitions to describe different environmental levels. In contrast, shielded systems work with 10GBASE-T ‘by design’, UTP systems require an increased level of time consuming and costly ‘immunity installation’
practices.

Read the details of this study.

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