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环境要求

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维普资讯 http://www.cqvip.com 。 甏 霞 薹 逶 环境要求 The variety of closures that are available today can be 光缆的大量使用促进了接头盒种类 attributed to the surge in fiber applications. In 1994,Bellcore 的发展。1994年,Bellcore根据具体应用 modified its universal TR——77 1 specification to test closures in 环境要求修改了测试接头盒的通用TR一 accordance to environmentla requirements of speciifc applications. 771标准。例如,新GR一771标准把接头 For example,the new GR一77 1 speciifcation groups closures into 盒的应用类型分为六类:埋地式、地下 six deployment families:buried,underground,pedestal,outdoor 式、支架式、外墙式、架空式及内墙式。这 wall,aerial pole and strand and indoor wal1.This specification 个标准是确定接头盒是否适合特殊应用 is a useful tool to determine if a closure is suitable for a 的一个有用的工具。虽然有些接头盒只 targeted application. While some closures fit into only one 适用于一种应用类型,但其它的接头盒 deployment family,"others may cross a few lines.Therefore,users 也许可以通用。因此,用户应根据自己的 should conslut with closure manufacturers on their unique needs. 特殊需要与接头盒制造商进行协商。 Following is a cursory review of four environmental 下面我们来简单分析一下四种接头 categories:aerial,pedestal,combined buried and underground, 盒类型:架空型、支架型、埋地与地下结 nad universa1.hTe following recommendations address both 合型以及通用型。以下所提建议既适合 typical and unique needs and highlight areas where Bellcore 一般应用也适合特殊应用,重点放在超 speciifcations should be exceeded.For more detailed information 出Bellcore技术规范的地方。若想了解 on environmentla requirements and the tests for certification, 对环境要求和认证测试的详细资料,请 reference Bellcore GR-77 1. 参考Bellcore GR一771标准。 hTis group includes weather—tight, free-breathing closures 此类接头盒包括要求能遮风挡雨、 that are required to pass a wind—driven rain test.Their tongue— 透气性好的接头盒,需要通过风雨测试 and——rgoove design allows these closures to maintain weather 舌榫接合的设计结构让这些接头盒能防 tightness.Typically, breathable openings can be found on the 风挡雨。一般来说,在接头盒的底部有一 bottom of the closure.A metal screen that is sonically welded to 个通气口。通气口上有一层用波峰焊接 the plastic to prevent infestation by insects should cover these 方式焊到塑料上的金属丝网,以防昆虫 openings. Bellcore requires d 90-day salt fog test to identify 侵入。Bellcore还要求进行90天的盐雾 corrosion problems. Bellcore also speciifes a conditional bullet 测试来测试防腐性能。如有特殊要求, resistance test, if the unique need exists.This test requires a Bellcore还要求进行防弹测试。做此测试 12——gauge shotgun to fire from a 50-foot distance using 71/2 时需用12mm口径猎,71/2子弹从 shot. 15m外射击。 Splice closures are designed to do a lot more than simply 光纤接头盒除满足应用/环境要求 meet application/environmentla requirements.For example,they 外还能做很多事。比如,通过重返、重新 should also be designed to keep the plant operating for at least 配置和高水平的工艺,它能使有线设施 20 years by allowing re-entyr,re—confiugrations and a high level 至少运行20年。为充分发挥其优越性, of craft—firendliness.To get the full benefit,there are several 在挑选和比较各种接头盒时有几个因素 factors to consider when selecting and comparing closures. 需要加以考虑。A ・ (陈华) 

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