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DIN EN 300451-2002 通路和终端(AT).普通质量音频带宽四线模拟租用专线(A4O).连接特性和网络接口表示

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【英文标准名称】:AccessandTerminals(AT)-Ordinaryqualityvoicebandwidth4-wireanalogueleasedline(A4O)-Connectioncharacteristicsandnetworkinterfacepresentation(EndorsementoftheEnglishversionEN300451V1.2.1(2001-07)asGermanStandard)
【原文标准名称】:通路和终端(AT).普通质量音频带宽四线模拟租用专线(A4O).连接特性和网络接口表示
【标准号】:DINEN300451-2002
【标准状态】:现行
【国别】:德国
【发布日期】:2002-01
【实施或试行日期】:
【发布单位】:德国标准化学会(DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:远程通信;专业网络;通信设备;接口;终端装置;定义;规范(验收);通信网;网络接口;电气工程;模拟;电信;租用专线;商务电信;特性;通信传输线路
【英文主题词】:
【摘要】:Thedocumentspecifiesrequirementsinthetelecommunicationssector.
【中国标准分类号】:M30
【国际标准分类号】:33_040_50
【页数】:1P;A4
【正文语种】:德语


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【英文标准名称】:Testingofmetallicmaterials;tensiletestpieces
【原文标准名称】:金属材料的检验.拉力试样
【标准号】:DIN50125-1986
【标准状态】:作废
【国别】:
【发布日期】:
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:
【国际标准分类号】:
【页数】:
【正文语种】:


Product Code:SAE J1661
Title:Procedure Retrofitting CFC-12 (R-12) Mobile Air-Conditioning Systems to HFC-134a (R-134a)
Issuing Committee:Interior Climate Control Committee
Scope:The purpose of this SAE Recommended Practice is to provide a service procedure for retrofitting a CFC-12 (R-12) system to HFC-134a (R-134a) while preserving performance and integrity of the air-conditioning (A/C) system. The steps outlined in this procedure are complete when combined with good service practices and the vehicle manufacturer's recommendations (if available) for retrofitting their models.Separate service equipment, for CFC-12 (R-12) and HFC-134a (R-134a), including refrigerant recovery/recycle (R/R), service manifolds, vacuum pumps, and charging equipment shall be used to preserve the purity of the refrigerants and the mobile A/C systems. This procedure will minimize release of refrigerant to the atmosphere, and will preserve the integrity of the recycled CFC-12 (R-12) and HFC-134a (R-134a) supplies.This document applies to A/C systems used to cool the passenger compartment of automobiles, light trucks, and other vehicles with similar CFC-12 (R-12) systems. Due to technical advancements in recent years, this procedure is recommended for common vehicle platforms produced in the mid-1980s and later. Vehicles produced before this time period may require additional retrofit requirements. A/C systems used on mobile vehicles for refrigerated cargo that have hermetically sealed systems are not covered by this document.This document is only complete when combined with the requirements of SAE J1657 "Selection Criteria for Retrofit Refrigerants to Replace CFC-12 (R-12) in Mobile Air-conditioning Systems."