Conformity Magazine - October 2007 - (Page 15)

network elements, and helps to identify environmental compatibility problems before production. To receive NEBS compliance, a network element such as a battery must undergo a series of environmental, mechanical, and electrical tests. A battery cannot be deployed in the field without complying with NEBS. However, NEBS does not validate performance requirements, nor anticipate the possible failure modes and responses of lithium batteries. Complying with NEBS, therefore, does not necessarily mean that a battery will operate and perform as expected over its life. Consensus on the electrical, environmental, mechanical, physical design, battery management system, quality and reliability, documentation, and training requirements beyond NEBS is needed to determine if lithium batteries will perform as expected and will not endanger staff or infrastructure. • Verifying Electronics Reliability: Telcordia SR-332, Reliability Prediction Procedure for Electronic Equipment, stipulates that the electronics used in the network should provide a minimum mean time before failure (MTBF) failure. This metric is especially important for the safety circuits that govern lithium cells. Premature failure of the safety circuitry could result in battery system failure and loss of back-up power. It is the responsibility of carriers to make sure that supplier electronics reliability calculations are correct and provide adequate results. Generally, any additional circuitry decreases system reliability but, in the case of lithium batteries, the safety concerns go beyond the potential reduction in reliability. GR-3150 Meets the Challenge GR-3150 is the first vendor-neutral and concise GR document that addresses the use of telecom-grade, rechargeable, nonaqueous, large-format lithium batteries. With several funding participants from the battery/telecom industry to lend expertise in its development, Telcordia GR-3150 includes 154 generic2 requirements, 73 conditional requirements, 144 objectives, and no conditional objectives5 or conditionals6, all grouped into three criteria levels to address product selection. In total, there are 175 requirement objects in GR3150, categorized according to general product , safety, and performance. GR-3150-CORE is organized into 6 major sections, 3 appendixes, and an ROI list. Sections 1 through 4 are described in the remainder of this article. Sections 5 (Performance Criteria) and 6 (Service Life Criteria), as well as the appendixes and ROI list, are described in Part 2 of this series, which will be published in the November issue of Conformity. Section 1, Introduction This section provides the purpose and scope, lithium battery general product and safety and performance criteria levels, and explanations of the requirements terminology and labeling Figure 2: UPS cargo plane on fire due to lithium battery mishap october 2007 conformity 15 http://www.fair-rite.com http://www.fair-rite.com

Table of Contents Feed for the Digital Edition of Conformity Magazine - October 2007

Contents Editor’s Note Commission Proposes Changes for 57-64 GHz Spectrum Rules FCC Continues Actions Against Jamming Device Distributors Radio Operator Fined for Failing to Make Equipment Available for Inspection Commission Fines Unsolicited Fax Advertisers Firm Offering Quality Standards Training Also Fined Breaking New Ground with Lithium-Battery Generic Requirements for Use in Telecommunications Facilities ESD Open Forum EMC UK 2007 Conference Set Staying Abreast of U.S. E-Waste Legislation EU Commission Establishes RFID Expert Group Update on China's CCC Compliance Program System Level ESD Testing: The Waveforms An Alternative Approach to Surge Suppression Testing Equipment Buyer's Guide EU Scientific Committee Releases Updated Data on EMF Risks Updated Standards List For The EU’s EMC Directive Updated Standards List For The EU’s Directives on Measuring Instruments Call for Presentations for 2008 International ESD Workshop Announced CPSC Actions In The News IEC Standards Update Product Reviews UL Standards Update New Products From Our “You Can’t Make This Stuff Up” Department Looking Back: Items from Past Issues of Conformity Upcoming Events Advertisers

Conformity Magazine - October 2007

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