ETSI ES 203 156描述了中定义的室外外壳的热管理要求 EN 301 169-1[i.4]和EN 301 169-2[i.5]。这些需要定义的热管理要求包括:室外外壳冷却能力的标准化定义；环境温度和内部温度之间的最大可接受差值T；室外外壳内气流的优选规则；有线和无线接入网电信设备的环境等级 安装在室外外壳中。并非所有这些要求都适用于EN 301 169-1[i.4]和EN 301 169中定义的室外外壳- 2[i.5]； 符合EN 301 169-1[i.4]的设备的最大可接受增量T应被视为 开发商本文件的目的是更容易定义设备制造商的责任， 机柜制造商和集成商。EMC、安全和噪声要求不是本文件的组成部分。关于这些方面的指导是 载于附件D。

ETSI ES 203 156 describes the thermal management requirements for outdoor enclosures defined in EN 301 169-1 [i.4] and EN 301 169-2 [i.5]. These thermal management requirements to be defined include:a standardized definition of cooling capacity for outdoor enclosures;a maximum acceptable delta T between ambient temperature and inside temperature;the preferable rule for air flow inside outdoor enclosures;the environment class for telecommunication equipment of wireline and wireless access network to be installed in outdoor enclosures.Not all these requirement are applicable to outdoor enclosures defined in EN 301 169-1 [i.4] and EN 301 169-2 [i.5]; maximum acceptable delta T for equipment in line with EN 301 169-1 [i.4] should be considered as a guide to developer.The purpose of the present document is to make it more easy to define the responsibility of equipment manufacturers, cabinet manufacturers and integrators.EMC, safety and acoustic noise requirements are not parts of the present document. Guidance on these aspects are contained in annex D.