ATIS - Alliance for Telecommunications Industry Solutions
适用范围
The surface temperature considerations and criteria in this standard are applicable to network equipment intended to be installed in environmentally controlled telecommunications network facilities. Examples of such locations are Central Offices@ Controlled Environmental Vaults@ and aboveground Huts. This standard does not apply to auxiliary monitoring equipment such as oscilloscopes@ personal computers@ portable test equipment@ etc.@ which are not integral to the equipment. It also does not apply to network equipment that is designed for use solely in an outside plant cabinet/enclosure or equipment intended to be located solely at a customer premises location. Purpose Application The purpose of this standard is to provide test methods and define limits for surface temperatures of network equipment. Network equipment shall not have hot exterior surfaces that would cause injury or accident through deliberate or accidental contact. Limiting surface temperatures or preventing contact will reduce the potential risk of injury to craft personnel or the possibility of damage to equipment that could result in a service outage. The equipment surfaces that face aisles or surfaces where normal maintenance functions are anticipated shall be in conformance to temperature limits established in Table 1. Passive equipment@ wherein no heat is generated@ are exempt from testing. Surfaces protected from normal craft access are not subject to temperature limits described. These protected surfaces are as follows: 1) Equipment side surfaces shielded by cable bundles@ cabinet side panels@ and/or rack uprights; 2) Top and bottom panels isolated by equipment vertically stacked above/below; 3) Protective shields@ backplanes inboard of cables ear; or 4) Internal circuit boards and board components. The surfaces to which craftsperson may be exposed are typically equipment parts that are as a normal function of the operation or servicing of the equipment: 1) Equipment surfaces that the hands@ arms@ or face of the craftsperson may contact. 2) Equipment surfaces that could cause burns or result in unexpected reaction of craftsperson. 3) Equipment surfaces such as handles@ circuit pack dislodging levers@ or retaining hardware that require a craftsperson to have prolonged exposure shall have lower temperature limits than surfaces with shorter exposure time. These surfaces shall have lower temperature limits than surfaces with shorter exposure time. The stated temperature limits do not include the direct exhaust air discharge temperatures of equipment. However@ if applicable equipment surface temperatures should become elevated by the heated exhaust airflow@ the temperature limits would apply to those surfaces.