思科认证精华知识:NEBS[1]
来源:学生作业帮助网 编辑:作业帮 时间:2024/04/28 20:13:26 Cisco认证
中文名:NEBS
外文名:Network Equipment-Building System
表示:网络设备构建系统
起源:70年代,
主要的贝尔核是:GR-63-CORE
系统要求:物理保护。
起源
NEBS 的历史可以追溯到70年代,当时它由贝尔实验室开发,被用于标准化被最终安装到中心局的设备。其目的是让设备商更容易地设计兼容于典型本地贝尔运营公司的设备。标准化导致开发费用的降低和更容易将新设备引进到网络中。
2组成文件
主要的贝尔核(Bellcore)是 GR-63-CORE, 网络设备建造系统(NEBS)要求:物理保护。
这个文件确定了用于安装到本地贝尔运营公司中心局的新电信设备最小空间和环境标准。
安装空间要求:
* 缆线分布系统
* 分布和互联框架
*t电源设备
*操作支持系统
*缆线增强设施
工作环境要求:
* 温湿度
*防火性
*设备操作性
*抗震性
*工作环境振动和运输振动
* 空气污染
* 声学噪音
* 照明
3认证标准级别
NEBS认证标准分为三种级别,每个级别有自己的目标和用途,但第3级确保最大的设备可操作性,用于关键网络设备。 X335和x343提供符合NEBS 第3级标准的产品。What is "NEBS Level 3"? "NEBS Level 3" is a term from Bellcore special report, SR-3580. This report details 3 distinct functional levels of NEBS compliance based on GR-63-CORE and GR-1089-CORE. The levels allow a wide range of NEBS requirements to be applied to equipment based on application and network impact.
一级
NEBS第1级是指设备通过了确保网络设备中安全部署的一系列最小测试。"NEBS Level 1" means that people and equipment hazards and network degradation are minimized. NEBS Level 1 addresses the personnel and equipment safety requirements of GR-63-CORE and GR-1089-CORE. This is useful for getting prototypes into a lab trial. It's also a requirement that is imposed on Competitive Local Exchange Carriers (CLECs) in order for them to deploy equipment into an RBOC's network. This level doesn't address operability, this is addressed in Levels 2 and 3.
二级
NEBS第2级提供网络设备中设备可操作性的有限保证。"NEBS Level 2" addresses equipment operability, but in a controlled environment. For example, equipment could be used in a data center, however, if the equipment performs non-critical operations it could be used under environmental extremes. Note that this level is very rarely used because it is ambiguous.
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