White Paper: Shortlinks Structured Cabling - Data Center - R&M

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Short Links in Structured Cabling – More Performance and Reliability with Cat. 6A Contents 1. The development of ISO/IEC 11801 ...........................................................................................................3 2. The wish for shorter links and the question of headroom ...........................................................................4 3. The advantage of additional headroom ......................................................................................................5 4. How to measure short permanent links? ....................................................................................................6 5. Conclusion: short and sweet.......................................................................................................................8 Annex: The permanent link model of ISO/IEC 11801 Amendment 2.................................................................9 © Copyright 2011 Reichle & De-Massari AG (R&M). All rights reserved. Dissemination and reproduction of this publication or parts hereof, for any purpose and in any form whatsoever, are prohibited without the express written approval of Reichle & De Massari AG. Information contained in this publication may be altered without prior notice. This document was produced with the greatest possible care; it presents the state of the art at the time of preparation. The right to make technical changes is reserved. White Paper | Short Links in Structured Cabling | v1.0 | ENG | Peter Fischer, Bruno Ritter 2
In the course of the development of Class EA, changes in cabling structure definitions were introduced in the standard ISO/IEC 11801 2010 Amendment 2. As a consequence, the standard no longer guaranteed the fulfilling of permanent link requirements with links below 15 meters in length. In various applications, however, lengths of below 15 m are regularly used, for example in data centers and office cabling. This white paper informs about the latest developments in standardized copper cabling solutions for short links. It aims to present new possibilities, provide information on the planning of high-performance data networks and decision support for product selection. 1. The development of ISO/IEC 11801 In 2006, the IEEE published the standard IEEE 802.3an, which defined the protocol for 10 Gigabit Ethernet (10GBase-T). After that the relevant standardization bodies set out to incorporate the requirements in the cabling standards. In 2008, the ISO/IEC 11801 Amendment 1 was released, defining the channel specifications – Class EA. The definition of the components, however, was not specified. The release of the ISO/IEC 11801 Amendment 2 in 2010 has closed this gap. The new standard defines the connecting hardware, i.e. cables and plug connectors of Cat. 6A (Table 1). Frequency IEEE EIA/TIA ISO/IEC Channel etc. Channel Components Channel Components 1-500 MHz 10GBase-T IEEE 802.3an (2006) Cat. 6A EIA/TIA 568B.2-10 (2008) Cat. 6A EIA/TIA 568B.2-10 White Paper | Short Links in Structured Cabling | v1.0 | ENG | Peter Fischer, Bruno Ritter 3 (2008) Application: Structured cabling, 10 Gigabit Ethernet Class EA ISO/IEC 11801 Amendment 1 (2008) Table 1: Current cabling standards for typical requirements in data center and office cabling. Technology: Cat. 6A ISO connection modules, RJ45 plug connectors, twisted pair copper cabling Format: White Paper Topics: ISO/IEC 11801 Amendment 2, Channel Link and Permanent Link, NEXT headroom, planning of links and link lengths, benefits in efficiency, performance and cost thanks to high-grade components in short links Target: Inform about the use of short links in structured cabling, discuss planning and product selection, and R&M's quality positioning in Cat. 6A ISO/IEC Target group: Network managers, installers, data center planners Authors: Peter Fischer, Bruno Ritter Published: June 2011 Cat. 6A ISO/IEC 11801 Amendment 2 See also the online available R&M white papers, published between 2006 and 2009, on the topics 10GBase- T and Cat. 6A. The standard specifies that Class EA can only be fulfilled with Cat. EA components when the minimum length of 15 m for the permanent link (PL) is observed. The use of shorter PLs is allowed when the manufacturer guarantees that the PL requirements are met. (2010)
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