1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0600010.2014 TEMPERATURE, HUMIDITY, AND ALTITUDE REQUIREMENTS FOR NETWORK TELECOMMUNICATIONS EQUIPMENT UTILIZED IN CONTROLLED ENVIRONMENTAL SPACES As a leading technology and solutions development organization, ATIS brings together the top glob
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11、ational Standards Institute. Notice of Disclaimer however, only the editions cited are applicable for this standard. GR-63-CORE, NEBS Requirements: Physical Protection, Issue 4, April 2012.1ATIS 0600010.03.2011, Heat Dissipation Requirements for Network Telecommunications Equipment.23 Definitions 3.
12、1 Ambient Temperature and Humidity: The environmental temperature and humidity surrounding telecommunications equipment. 3.2 Central Office (CO): A building or part of a building under the exclusive control of a telecommunications utility designed to house wireline telecommunications equipment. 1Tel
13、cordia documents are available from Telcordia at . 2This document is available from the Alliance for Telecommunications Industry Solutions (ATIS) at . ATIS-0600010.2014 2 3.3 Climatogram: A chart used to graphically display an envelope of climatic conditions expected as part of an environmental clas
14、s. 3.4 Controlled Environment: A space housing telecommunications equipment that provides ambient temperature and humidity conditions within the ranges specified in this standard. 3.5 Controlled Environmental Vault (CEV): A small (e.g., 10 x 20), environmentally controlled underground concrete struc
15、ture used to house telecommunications equipment. 3.6 Customer Premises: Any space that houses telecommunications equipment that is not under the exclusive control of a telecommunications utility (and has limited access). 3.7 Equipment Under Test (EUT): The equipment being reviewed for conformance to
16、 the requirements specified in this standard. 3.8 Frame Level: An equipment frame consists of structural framework that occupies floor space and all the equipment mounted in it. 3.9 Hut: A small (e.g., 10 x 20), environmentally controlled aboveground structure used to house telecommunications equipm
17、ent. 3.10 Mobile Telecommunications Switching Offices (MTSO): A building or part of a building under the exclusive control of a telecommunications utility designed to house wireless telecommunications equipment. 3.11 Operating Temperature and Humidity: Temperature and humidity range that equipment m
18、ay be exposed to during continuous operation. 3.12 Relative Humidity (RH): The ratio, expressed in percent, of the amount of atmospheric moisture present relative to the amount that would be present if the air were saturated at a specific temperature. 3.13 Shelf Level: A single chassis of equipment
19、that mounts inside a framework. 3.14 Short Term Temperature and Humidity: Temperature and humidity range that equipment may be exposed to during short durations of time, not to exceed 4 days continuous exposure or 15 days over a 12 month period. 3.15 Storage: Network equipment placed at a site for a
20、 period of time while packaged or unpackaged and not intended to be operated during the storage period. 3.16 Thermal Stabilization: A steady state condition by which the average temperature measured varies by no more than 2C (3.6F) over the span of one hour. 3.17 Transportation: The loading, unloadi
21、ng, and movement of network equipment from one place to another before installation in the network. 4 Environment Classification 4.1 Operating Temperature & Humidity The temperature and humidity operating environments are shown in Table 4.1. This defines the typical operating environments in which e
22、quipment is deployed. Table 4.1: Temperature and Humidity Range of Operation Temperature Range Humidity Range Operating Short Term* Operating Short Term 5 to 40C (41 to 104 F) -5 to 50C (23 to 122F)5 to 85% RH 5 to 90% RH * Test requirements may be higher than the specified operating environment. AT
23、IS-0600010.2014 3 4.2 Operating Altitude It is expected that network equipment may be routinely installed at elevations up to 1829 m (6,000 ft) above sea level. In some cases, network equipment may be installed at elevations up to 3962 m (13,000 ft) above sea level. At high elevations, the lower den
24、sity of the air reduces its cooling capacity. Appropriate cooling capacity must therefore be provided. The high altitude environment is defined in Table 4.2. Table 4.2: Elevation and Temperature Range for High Altitude Environments Altitude (Above Sea Level) Maximum Operating Temperature* All Equipm
25、ent 1829 m (6,000 ft) 50C (122F) Equipment intended for very high altitude installations 3962 m (13,000 ft) 40C (104F) * The test temperature may be higher than the specified operating environment. 4.3 Storage & Transportation Conditions Network equipment may be exposed to a variety of extreme tempe
26、ratures and humidity while being transported or stored. The storage and transportation environments are defined in Table 4.3. Table 4.3: Temperature and Humidity Range for Storage and Transportation Environments Temperature Relative Humidity, % Low Temperature -40C (-40F) Not controlled High Tempera
27、ture 70C (158F) Not controlled High Humidity 40C (104F) 95 5 Equipment Cooling Category Equipment cooling categorizations are defined based on the cooling media and methodology. 5.1.1 Natural or Free Convection Natural or free convection is heat transfer that relies on fluid motion caused by the dif
28、ference in density of heated fluids and the action of gravity. Telecommunications equipment cooled by natural or free convection does not rely on fans, blowers, or pumps for cooling. 5.1.2 Forced Convection Forced convection is heat transfer that relies on powered means to cool a device. See ATIS-06
29、00010.03, Heat Dissipation Requirements for Network Telecommunications Equipment, to determine airflow directions and designations. Any telecom equipment manufacturer should pictorially specify the location of the inlet air and exhaust air as it applies to each specific design in its intended enviro
30、nment. For example, for a shelf that is to be deployed in a third-party rack, the manufacturer should designate the air inlet and exhausts with respect to the rack. ATIS-0600010.2014 4 5.1.3 Liquid Cooled Liquid cooling is expected to be at the component-level or frame-/cabinet-level, not at the roo
31、m-level. For reasons of cost and feasibility, liquid cooling is not a preferred cooling method for telecom equipment and currently is not widespread. However, as the power densities grow, it is possible that in the future some elements of the network may have to use this technology to be able to acc
32、ommodate the desirable speed, size, or capacity. Therefore, it is advisable that telecom industry and standard bodies look into various technologies and adopt some, so that manufacturers can move some designs to liquid cooling if needed. 6 Environmental Test Conditions 6.1 Temperatures & Humidity Th
33、e baseline temperature and humidity test conditions for the EUT are shown in Table 6.1 covering variations in equipment configuration such as frame-level, shelf-level, and air intake designs. It is preferred that the air intake be at the front of the EUT. EUTs with air deflecting systems that bring
34、the air in from the front are considered as front-air intake equipment and must be tested with these systems in place. For EUTs with other air-flow configurations, the maximum test temperature (TMAX) shall be raised by 10C as shown in Table 6.1. NOTE: These air deflecting systems become part of the
35、EUT configuration and are subject to tests applicable for that configuration. Such air deflecting systems may also be subject to other mechanical tests as specified in the applicable ATIS standards. Table 6.1: Environment Temperature and Humidity Max Temp (TMAX) Nominal Temp Nominal Humidity Min Tem
36、p Low Humidity Max Humidity Frame-level 50C (122F) 25.6C (78.1F) 35%RH -5C (23F) 5%RH* non-condensing 93%RH non-condensing Shelf-level 55C (131F) Frame-level without front air intake 60C (140F) Shelf-level without front air intake 65C (149F) *Humidity is uncontrollable at temperatures below 5C. 6.2
37、Altitude The pressure levels and temperature conditions shown in Table 6.2 below provide the test conditions for equipment used in high altitude applications. ATIS-0600010.2014 5 Table 6.2: Altitude Temperature - Pressure Levels Temp (TMAX) Altitude (Above Sea Level) Pressure Relative Humidity, % Du
38、ration (Hrs) 1Temperature Compensation 2All Equipment Frame-level 50C (122F) 1829 m (6000 ft) 80 kPa (600 torr) Not controlled 8 refer to 9.3 Shelf-level 55C (131F) Frame-level without front air intake 60C (140F) Shelf-level without front air intake 65C (149F) Equipment intended for high altitude in
39、stallations Frame-level 40C (104F) 3962 m (13000 ft) 60 kPa (450 torr) Not controlled 8 refer to 9.3 Shelf-level 45C (113F) Frame-level without front air intake 50C (122F) Shelf-level without front air intake 55C (131F) NOTE 1: Where cooling capability is determined by the temperature compensation m
40、ethod, the sensitivity of components to reduced air density is determined with a duration of 4 hours. NOTE 2: Temperature compensation may be used to simulate the reduced cooling capability of air at high altitudes. A linear compensation of 1C/304.8 m (1.8F/1000 ft) is used. 6.3 Storage/Transportati
41、on Temperature & Humidity The test conditions for simulating the possible storage/transportation conditions of the equipment are provided below in Table 6.3. Table 6.3: Storage/Transportation, Temperature and Humidity Levels Temp Relative Humidity, % Duration, Hrs Rate of Temp Change Low Temperature
42、 -40C (-40F) Not controlled 72 Return to room temp in less than 5 minutes High Temperature 70C (158F) Not controlled 72 Return to room temp in less than 5 minutes High Humidity 40C (104F) 95 96 7 General Test Conditions 7.1 Test Apparatus For each test, it is desirable that the test apparatus consis
43、t of a single test chamber that is able to produce the exposure conditions described in this test procedure and have the following characteristics: To ensure proper airflow around the EUT, the volume of the test chamber should be at least five times the total volume of the EUT. The EUT should be kep
44、t a minimum of 15.2 cm (6 in) from all chamber walls. The air flow in the test chamber should be less than 1 m/s (197 ft/min) near the EUT in order to prevent undue influence on the ventilation system of the EUT. This allows components inside the equipment to reach their working temperature during t
45、he test in relation to the ambient conditions of the chamber. Chamber airflow velocity can be assessed prior to insertion of EUT. The test chamber shall control the temperature and humidity such that the specified rates of change can be obtained. ATIS-0600010.2014 6 Environmental chambers shall be c
46、apable of controlling temperature within a tolerance of 3C, and humidity within a tolerance of 5% RH. Altitude chambers shall be capable of controlling temperature within a tolerance of 3C, and pressure within a tolerance of 3kPa while dwelling. For purposes of this standard, 80 kPa (600 torr) absol
47、ute pressure will be equivalent to an altitude of 1829 m (6000 ft), and 60 kPa (450 torr) absolute will be equivalent to an altitude of 3962 m (13,000 ft). 7.2 Support Equipment The equipment should be appropriate for controlling, powering, or monitoring system performance for extended periods of ti
48、me. 7.3 Sample Requirements All testing shall be performed on equipment that is representative of the equipment deployed. Actual production samples are not required. If testing is performed with pre-release hardware and product changes occur prior to release, the changes must be analyzed to determin
49、e if they may reasonably impact the outcome of the tests. If a significant impact is indicated, the testing shall be repeated on released hardware. These simulations are “type tests” and are generally performed on a single equipment assembly or a single integrated system. For the purpose of this test, an equipment assembly is the smallest grouping of equipment sold by the manufacturer as a standalone piece of equipment. Equipment assemblies do not exceed 0.914 m (36”) in height. Equipment greater than 0.914 m (36
