The telecom industry is moving towards a "greener" supply chain for manufacturing. As part of this greening, more emphasis is being placed on logistics management, remanufacturing and recycling of e-waste. There has been much publicity concerning the environmental benefits of remanufacturing electronic equipment and reselling it to customers in lieu of manufacturing new like-kind equipment. This paper will provide an assessment of the environmental benefits associated with remanufacturing network telecommunications equipment by employing lifecycle assessment (LCA) methodology and commercially available LCA software / database information on these products. The results will demonstrate the significant environmental benefits of remanufacturing network telecommunications equipment as an "eco-sustainable" alternative to manufacturing new equipment.

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Background and Objective: The purpose of this study was to develop a feedback control system for the pulsed holmium: YAG medical laser that enhances tissue selectivity and safety by discriminating between soft and hard biological tissue such as urinary and biliary calculi and bone. Study Design/Materials and Methods: The ability to discriminate is achieved by monitoring prompt laser-induced visible/ NIR photoemissions via retrograde transmission over the laser delivery fiber in conjunction with a developed detection algorithm. Results: Experimental data are presented for a system that employs this discrimination scheme with an electro-optic shutter for rapid intrapulse feedback control of holmium laser-based lithotripsy procedures. The results demonstrate the feasibility of a lithotriptor that can deliver 1 J per pulse to calculi yet limit errant discharges to surrounding urinary tract tissue to Շ 0.1 J. Conclusion: Based on animal tissue safety data, the laser margin of safety is improved by an order of magnitude. Lasers Surg. Med. 21:20-28, 1997 © 1997 Wiley-Liss, Inc.

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