ANSI TIA EIA 569A-1995 电信通道和空间的商用建筑标准(英文版)

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商业建筑通信布线标准(TIA/EIA568)

商业建筑通信布线标准(TIA/EIA568)

商业建筑通信布线标准EIA/TIA 5681.1 目的这个标准确定了一个可以支持多品种多厂家的商业建筑的综合布线系统,同时也提供了为商业服务的电信产品的设计方向。

即使对随后安装的电信产品不甚了解,该标准可帮您对产品进行设计和安装。

在建筑建造和改造过程中进行布线系统的安装比建筑落成后实施要大大节省人力物力财力。

这个标准确定了各种各样布线系统配置的相关元器件的性能和技术标准。

为达到一个多功能的布线系统,已对大多数电信业务的性能要求进行了审核。

业务的多样化及新业务的不断出现会对所需性能作某些限制。

用户为了了解这些限制应知道所需业务的标准。

1. 2 相关的标准这个标准是一系列关于建筑布线中电信产品和业务的技术标准之一。

本文连同相关的标准满足了电信行业发展企业结构的需要。

为电信服务的商业建筑标准(EIA/TIA-569) (Ref B1.3) 和住宅及小型商业区综合布线标准(EIA/TIA-570)(Ref B1.2)。

1. 3 标准的说明标准分为强制性和建议性两种。

所谓强制性是指要必须的,而建议性要求意味着也许可能或希望。

(这两种概念将在本文替出现)。

强制性标准通常适于保护、生产、管理,兼容:它强调了绝对的最小限度可接受的要求,建议性或希望性的标准通常针对最终产品。

在某种程度上在统计围确保全部产品同使用的设施设备相适应体现了这些准则。

另一方面,建议性准则是用来在产品的制造中提高生产率,无论是强制性的要求还是建议性的都是为同一标准的技术规。

建议性的标准是为了达到一个目的,就是未来的设计要努力达到特殊的兼容性或实施的先进性。

在本文中。

图表中的注释是标准的一个正式的部分,是用来提供有益的建议。

其他文件的引用除了特殊说明外都指的是标准的最新修订本。

该标准是现行使用的,文中所涉及的标准都是服从修订本的,而且通过在网络的工作过程及终端设备的布线技术中得到了验证。

1. 4综合布线系统的结构图1.1给出现代建筑布线系统的各个功能部分的模型。

商用建筑物电信布线标准

商用建筑物电信布线标准

商用建筑物电信布线标准
商用建筑物的电信布线标准,可以参照EIA/TIA-568A、EIA/TIA-569、EIA/TIA-570和TIA/EIA-606等标准。

这些标准详细规定了电信布线的标准和要求,包括布线系统的配置、元件的性能和技术要求等。

考虑到商业建筑物的特性,如不确定性和易变化性,布线系统通常采用大开间设计,利用分隔板将大开间分成若干个小工作区,并预留适当的用户信息插座在墙面或柱子等固定结构上。

同时,这些标准还规定了工作区隔间的数量限制,例如不超过12个。

这些标准是商业建筑电信布线的关键参考,有助于确保布线系统的性能和兼容性,以满足商业服务的需求。

如需更多信息,建议咨询电信布线领域的专家。

综合布线系统标准

综合布线系统标准

综合布线系统标准综合布线系统自问世以来已经历了近二十年的历史,这期间,随着信息技术的发展,布线技术也在不断推陈出新;与之相适应,布线系统相关标准的发展也有相当长的时间,国际标准化委员会ISO/IEC,欧洲标准化委员会CENELEC和北美的工业技术标准化委员会TIA/EIA都在努力制定更新的标准以满足技术和市场的需求。

为使大家更好的了解和应用这些标准,我们在此将综合布线系统相关标准向大家作一介绍。

以下为与布线有关的组织与机构:ANSI美国国家标准协会American National Standards InstituteBICSI国际建筑业咨询服务Building Industry Consulting Service InternationalCCITT国际电报和电话协商委员会Consultative Committee on International Telegraphy and Telephony(现在,ITU-TSS)EIA电子行业协会Electronic Industries AssociationICEA绝缘电缆工程师协会Insulated Cable Engineers AssociationIEC国际电工委员会International Electrotechnical CommissionIEEE美国电气与电子工程师协会Institute of Electrical and Electronics EngineersISO国际标准化组织International Standards Organization(formally,International Organization for Standardization)ITU-TSS国际电信联盟-电信标准化分部International Telecommunications Union-Telecommunications Standardization SectionNEMA国家电气制造商协会National Electrical Manufacturers AssociationNFPA国家防火协会National Fire Protection AssociationTIA电信行业协会Telecommunications Industry AssociationUL安全实验室Underwriters LaboratoriesETL电子测试实验室Electronic Testing LaboratoriesFCC美国联邦电信委员会Federal Communications Commission(U.S.)NEC国家电气规范National Electrical Code(issued by the NFPA in the U.S.)CSA加拿大标准协会Canadian Standards AssociationISC加拿大工业技术协会Industry and Science CanadaSCC加拿大标准委员会Standards Council of Canada这些组织都在不断努力制定更新的标准以满足技术和市场的需求。

商业建筑通信布线标准EIA568和EIA569(英文)

商业建筑通信布线标准EIA568和EIA569(英文)

ANSI/TIA/EIA 568 StandardsANSI/TIA/EIA 569 StandardsStructured Cabling SystemsANSI/TIA/EIA 568COMMERCIAL BUILDING TELECOMMUNICATIONSCABLING STANDARDI. PURPOSEThis standard outlines specifications for a generic telecommunications cabling system. The purpose is to enable the planning and installation of telecommunications cabling with limited knowledge of the products that will be installed.This standard also establishes performance criteria for various system configurations and their elements.II. CABLING STRUCTUREThe elements of a cabling system are listed below:A. Horizontal CablingB. Backbone CablingC. Work AreaD. Telecommunications ClosetE. Equipment RoomF. Entrance FacilitiesIII. SCOPEThis standard specifies cabling of commercial buildings which are office oriented. Typically, this includes sites of up to 3,000 to 1,000,000 M2with a population up to 50,000 users.IV. HORIZONTAL CABLINGA. Horizontal cabling shall be of star topology, each work area connector shall be connected to a telecommunications closet. The maximum horizontal distance shall be 90 meters. An additional 10 meters is allowed for work area cables, patch cables, etc.B. Recognized Cables1. 4-pair 100 ♎ UTP cable2. 2-pair 150 ♎ STP cable3. 2-fiber, 62.5/125 um optical fiber cableC. Outlet/Connector A minimum of two telecommunications outlets shall be provided to each work area. The two outlets shall be configured as follows:1. One connector shall be supported by a 4-pair 100 ♎ UTP cable, Category 3 or higher2. The other shall be supported by a minimum of one of the following:a. 4-pair 100 ♎ UTP cable (Category 5 recommended)b. 2-pair 150 ♎ STP cablec. 2-fiber, 62.5/125 um optical fiber cableD. The amount of untwisting of individual pairs to terminate shall be less than or equal to .5 in. for Category 5 and less than or equal to 1.0 in. for Category 4.E. Cable bend radius shall not be less than 4 times the cable diameter.V. BACKBONE CABLINGThe purpose of backbone cabling is to provide interconnections between telecommunications entrance facilities, equipment rooms and closets. The backbone cabling includes transmission media, intermediate and main cross-connects, and mechanical terminations.A. Backbone cabling shall use the conventional hierarchical star topologyB. Recognized Cables1. 100 ♎ UTP multipair backbone cable2. 150 ♎ STP cable3. 62.5/125 um optical fiber cable4. Single Mode Optical FiberC. Maximum Distance1. 100 ♎UTP cable - 800 meters2. 150 ♎ STP cable - 700 meters3. 62.5/125 um optical fiber - 2000 meters4. Single mode optical fiber - 3000 metersVI. WORK AREASome networks require application specific electrical components on the telecommunications outlet of the horizontal cabling. These application specific components shall not be installed as part of the horizontal cabling. When needed they shall be placed external to the outlet.A. TELECOMMUNICATION CLOSETS1. Shall be designed per ANSI/EIA/TIA 569B. Function is for the termination of horizontal cableVIII. EQUIPMENT ROOMSA. Shall be designed per ANSI/EIA/TIA 569IX. ENTRANCE FACILITIESA. Requirements are specified in ANSI/EIA/TIA 569X. UTP CABLING SYSTEMSA. Categories of UTP Cabling are as follows:1. Category 1 & 2: These cables and connecting hardware are not covered or recognized as a part of the standard.2. Category 3: This designation applies to UTP cable and hardware whose transmission characteristics are specified up to 16 MHz.3. Category 4: This designation applies to UTP cables and associated connecting hardware whose characteristics are specified up to 20 MHz.4. Category 5: This designation applies to UTP cable and hardware whose transmission characteristics are specified up to 100 MHz.B. AttenuationHorizontal UTP Cable Attenuation[per 1 00m (328 ft.) @ 20'C]Frequency---Category 3---Category 4---Category 5--(MHz)----------(dB)----------(dB)-----------(dB)--0.064----------0.9-----------0.8------------0.8--0.256----------1.3-----------1.1------------1.1--0.512----------1.8-----------1.5------------1.5--0.772----------2.2-----------1.9------------1.8--1.0------------2.6-----------2.2------------2.0--4.0------------5.6-----------4.3------------4.1--8.0------------8.5-----------6.2------------5.8-10.0------------9.7-----------6.9------------6.5-16.0-----------13.1-----------8.9------------8.2-20.0-------------------------10.0------------9.3-25.0----------------------------------------10.4-31.25---------------------------------------11.7-62.5----------------------------------------17.0100.0----------------------------------------22.0C. Near End CrosstalkHorizontal UTP Cable NEXT Loss (Worst Pair)[@ > 1 00m (328 ft.)]Frequency---Category 3---Category 4---Category 5--(MHz)----------(dB)----------(dB)--------(dB)---1.5------------53------------68----------74---0.772----------43------------58----------64---1.0------------41------------56----------62---4.0------------32------------47----------53---8.0------------27------------42----------48--10.0------------26------------41----------47--16.0------------23------------38----------44--20.0--------------------------36----------42--25.0--------------------------------------41--31.25-------------------------------------39--62.5--------------------------------------35-100----------------------------------------32XI. UTP CONNECTING HARDWAREIt is desirable that hardware used to terminate UTP cables be of the IDC (Insulation Displacement Contact) Type.A. AttenuationUTP Connecting Hardware AttenuationFrequency---Category 3---Category 4---Category 5--(MHz)----------(dB)----------(dB)----------(dB)----1.0------------0.4------------0.1------------0.1----4.0------------0.4------------0.1------------0.1----8.0------------0.4------------0.1------------0.1---10.0------------0.4------------0.1------------0.1---16.0------------0.4------------0.2------------0.2---20.0----------------------------0.2------------0.2---25.0-------------------------------------------0.2---31.25------------------------------------------0.2---62.5-------------------------------------------0.3--100.0-------------------------------------------0.4B. Near End CrosstalkUTP Connecting Hardware NEXT LossFrequency---Category 3---Category 4---Category 5--(MHz)----------(dB)----------(dB)----------(dB)----1.0--------------58----------->65----------->65----4.0--------------46------------58------------>65----8.0--------------40------------52-------------62---10.0-------------38------------50-------------60---16.0-------------34------------46-------------56---20.0---------------------------------------------54---25.0---------------------------------------------52---31.25--------------------------------------------50---62.5---------------------------------------------44--100.0---------------------------------------------40C. Each 4-pair UTP Cable shall be terminated in an 8 position modular jack at the work area.XII. UTP PATCH CABLE AND JUMPERSA. Length1. In main cross-connect and intermediate cross-connect, patch cord lengths should not exceed 20 meters.2. In the telecommunications closet, jumpers that bridge horizontal wiring should not exceed 6 meters. Lengths in excess of these shall be deducted for maximum cable length.B. To assure adequate flex-life, UTP patch cords shall have stranded conductors.TIA/EIA 568 EIGHT-POSITION JACK PIN/PAIR ASSIGNMENTSTIA/EIA T568ATIA/EIA T568BANSI/TIA/EIA 569COMMERCIAL BUILDING STANDARD FORTELECOMMUNICATIONS PATHWAYS & SPACESI. PURPOSEThe purpose is to standardize design and construction practices within and between buildings which are in support of telecommunications equipment and media. Standards are outlined for rooms or areas and pathways into and through which telecommunications media and equipment are installed.II. SCOPEThe scope of the standard is limited to the telecommunications aspect of commercial building construction and design. The standard does not cover safety aspects of building design.Selections within the standard include:A. Horizontal PathwaysB. Backbone PathwaysC. WorkstationD. Telecommunications ClosetE. Equipment RoomF. Entrance FacilitiesIII. HORIZONTAL PATHWAYSHorizontal Pathways are facilities for the installation of telecommunication media from the telecommunication closet to the work area outlet.IV. BACKBONE PATHWAYSBackbone Pathways consist of intra- and interbuilding pathways.A. Intrabuilding Pathways consist of conduit, sleeves and trays. They provide the means for routing cables from:1. The entrance room or space to telecommunications closets.2. Equipment rooms to the entrance room or space, or telecommunications closet.B. lnterbuilding Pathways interconnect separate buildings, and consist of underground, buried, aerial and tunnel pathways.V. WORKSTATIONA typical example is a 4' x 4' electrical box having the horizontal cable terminated by connectors on faceplate. A minimum of one outlet shall be installed per workstation.VI. TELECOMMUNICATIONS CLOSETA. There shall be a minimum of one closet per floor.B. Additional closets should be added if the floor area to be served exceeds 1000 square meters or the horizontal distance to the work area is greater than 300 ft.V. LABELING AND COLOR CODINGA. Labels are divided into 3 categories1. Adhesive2. Insert3. OtherB. Adhesive labels shall meet adhesion, defacement and legibility requirements defined in U.L. 969. Labels shall also meet exposure requirements in U.L. 969.C. Insert labels shall also meet U.L. 969 requirements for defacement, legibility and general exposure.D. Other labels include special purpose labels, such as tie-on labels.E. All bar codes shall be either Code 39 or Code 128 conforming to USS-39 and USS-128 respectively. All Code 39 bar code ratios shall be within 2.5:1 to 3.0:1. If a wand scanner is to be used, a minimum quiet zone of 6.35 mm is required on each side of the bar code.VI. COLOR CODING RULESA. Termination labels at the two ends of the cable shall be of the same color.B. Cross-connections made between termination fields are generally of two different colors.C. The color orange is used for the demarcation point.D. Green is for the network connections on the customer side of the demarcation point.E. Purple is for the termination of cables originating from common equipment.F. White is for the first level backbone media.G. Gray is for the second level backbone.H. Blue is for the termination of station telecommunicators media.I. Brown is for interbuilding backbone cable terminations.J. Yellow is for termination of auxiliary circuits, alarms, security and other miscellaneous circuits.K. Red is for termination of key telephone systems.L. White may be used to identify second level backbone terminations in remote "non-hub" buildings.VII. DIFFERENTIATION OF TERMINATION FIELDS BY PERFORMANCE CATEGORYIf cables are of different performance classes, their ends should indicate the difference. This can be done by suitable marking or enhanced color coding. Alternatively, the labels may be marked with the proper category of the cable.For further information or copies of the preceding standards contact:EIA STANDARD SALES OFFICEGLOBAL ENGINEERING DOCUMENTS2001 Pennsylvania Ave., N.W. o r2805 McGaw AvenueWashington, D.C. 20006Irvine, CA 92714202-457-4966800-854-7179。

计算机网络基础(第二版)习题参考答案

计算机网络基础(第二版)习题参考答案

《计算机网络基础(第二版)》习题参考答案第一章1.填空题(1)计算机网络按网络的覆盖范围可分为_局域网_、城域网和__广域网__。

(2)从计算机网络组成的角度看,计算机网络从逻辑功能上可分为通信子网和__资源__子网。

(3)计算机网络的拓扑结构有星型、树型、总线型、环型和网状型。

2.简答题(1)计算机网络的发展经过哪几个阶段?每个阶段各有什么特点?答:单机系统:在单处理机联机网络中,由单用户独占一个系统发展到分时多用户系统,被称为第一代网络。

多机系统:将多个单处理机联机终端网络互相连接起来,以多处理机为中心的网络,并利用通信线路将多台主机连接起来,为用户提供服务,形成了以通信子网为核心的第二代网络,随着分组交换技术的使用,逐渐形成了以遵守网络体系结构的第三代网络。

Internet是计算机网络发展最典型的实例,该网络的发展也促使新的高速网络技术的不断出现,又提高了网络的发展。

(2)什么是计算机网络?计算机网络的主要功能是什么?答:利用通信设备和线路,将分布在地理位置不同的、功能独立的多个计算机系统连接起来,以功能完善的网络软件(网络通信协议及网络操作系统等)实现网络中资源共享和信息传递的系统。

主要功能:1. 数据交换和通信:在计算机之间快速可靠地相互传递数据、程序或文件;2. 资源共享:充分利用计算机网络中提供的资源(包括硬件、软件和数据);3. 提高系统的可靠性:通过计算机网络实现的备份技术可以提高计算机系统的可靠性。

4. 分布式网络处理和负载均衡:将任务分散到网络中的多台计算机上进行,减轻任务负荷过重的单台主机。

(3)计算机网络分为哪些子网?各个子网都包括哪些设备,各有什么特点?答:从计算机网络系统组成的角度看,典型的计算机网络分为资源子网和通信子网。

资源子网由主机、终端、终端控制器、连网外设、各种软件资源与信息资源组成。

主机是资源子网的主要组成单元,为本地用户和网络中远程用户访问网络其他主机设备与资源提供服务。

《商业建筑物电信布缆规范》综合介绍

《商业建筑物电信布缆规范》综合介绍
水平电缆和基干电缆之间的所有连线应为交叉连线。
《商业建筑物电信布缆规范》综合 介绍
8. 设备房
8.1 设备房与电信柜是有区别的; 8.2 设备房应根据ANSI/TIA/EIA-569中的要求进行设计
与装备; 8.3功能设备室将提供控制环境,以便安装电信设备,连
接硬件、接线盒,接地及连接设备以及在可能时安装 保护仪表。
b) 2-纤维多模光纤电缆,或62.5/125或50、125μm
(ANSI/TIA/EIA-568-B.3)。
《商业建筑物电信布缆规范》综合 介绍
4.5 电缆选型
每个工作区有“声音”和“数据”两个电信出口/连接器.
a) 一个电信引出口/连接器将由4-线对100欧姆3类以上 电缆(推荐采用5e类)支持; b)另一个/第二个电信引出口/连接器将最少由下面的其中 一个水平介质支持。此介质的选择是以目前预计的需求为 基础的。
《商业建筑物电信布缆规范》综合 介绍
9进局设备
9.1进局设备由电(光)缆、连接硬件、保安器件和其他 设备组成;
9.2设计:引入设备通路和空间可按照ANSI/TIA/ELA-569A的要求进行设计和安装。
9.3 功能: 9.3.1网路分界点 9.3.2电气保护 9.3.3汇接与接地 9.3.4引入设备的连接
等等………
《商业建筑物电信布缆规范》综合 介绍
3.2缩略语
例如:
ANSI AWG EMI FDDI IEEE STP NEXT UTP …….
美国国家标准协会 美国线视 电磁干扰 光纤配线数据接口 电气和电子工程协会 屏蔽绞线对 近端串音 未屏蔽的扭绞线对
《商业建筑物电信布缆规范》综合 介绍
《商业建筑物电信布缆规范》综合 介绍

EIA-TIA5684-8商用建筑物电信布线标准-1995

EIA/TIA5684/8商用建筑物电信布线标准-19951.总体规划一般来说,国际信息通信标准是随着科学技术的发展,逐步修订、完善的。

综合布线系统也是随着新技PDS期间,要提出并研究近年质量保证体系,并没有提出多少年投资保证。

为了保护建筑物投资者的利益,我们可采取花板内或管道里,要损坏建筑结构,影响整体美观。

2.系统设计综台布线是智能大厦建设中的一项新兴技术工程项目,它不完全是建筑工程中的“弱电”工程。

智能化建筑是由智能化建筑环境内系统集成中心利用综合布线系统连接和控制“3A”系统组成的。

布线系统设计是否合理,直接影响到“3A”的功能。

(3A即楼宇自动化—Building Automation、办公自动化—Office Automation、通信自动化—Communication Automation)设计与实现一个合理综合布线系统一般有六个步骤:n 获取建筑物平面图;n 分析用户需求;n 系统结构设计;n 布线路由设计;n 绘制布线施工图;n 编制布线用料清单。

星型拓扑结构布线方式,具有多元化的功能,可以使任一子系统单独地布线,每一子系统均为一独立的单元组,更改任一子系统时,均不会影响其它子系统。

一个完善确定设计的布线走线系统,其目标是,在既定时间以外,允许在有新需求的集成过程中,不必再去进行水平布线,损坏建筑装饰而影响审美。

等级:1.基本型(1)每个工作区(站)(2)每个工作区(站)4对双绞线,引至楼层配线架;(3)完全采用夹接式交接硬件;(4)每个工作区(站)的干线电缆(即楼层配线架至设备间总配线架电线)至少有2对双绞线。

2.增强型适用于综合布线系统中中等配置标难的场合,用铜芯电缆组网。

增强型综台布线系统配置:(1)每个工作区(站)(2)每个工作区(站)(3)采用夹接式(110A系列)(4)每个工作区(站))至少有3对双绞线。

3.综合型适用于综合布线系统中配置标准较高的场合,用光缆和铜芯电缆混合组网。

六类综合布线系统

第一章六类综合布线系统1.1设计标准及规范1、信息技术---用户房屋的综合布线ISO/IEC 118012、信息技术综合布线系统EN501733、商业建筑物电信布线标准TIA/EIA –568A、B4、电信通道和空间的商业建筑物标准EIA/TIA –5695、建筑与建筑群综合布线系统工程设计规范GB/T 50311-20076、建筑与建筑群布线系统工程验收规范GB/T 50312-20077、智能建筑设计标准GB/T 50314-20078、民用闭路监视电视系统工程技术规范GB/T 50198-949、工业企业通信设计规范GBJ 42-8110、工业企业通信接地设计规范GBJ 79-8511、通信用单模光纤系列GB/T 9771-199812、通信用多模光纤系列GB/T 12357-199013、电子计算机机房设计规范GB 50174-9314、火灾自动报警系统施工及验收规范 GB 50166-9215、火灾自动报警系统设计规范GB 50116-9816、智能建筑工程质量验收规范GB 50339-200317、大楼通信综合布线系统第一部分总规范YD/T 26.1-199718、大楼通信综合布线系统第二部分综合布线用电缆光缆技术要求YD/T 26.2-199719、大楼通信综合布线系统第三部分综合布线用连接硬件技术要求YD/T 26.3-199820、综合布线系统电气特性通用测试方法YD/T 1013-1999 信息产业部21、光纤配线架YD/T 778-199922、数字配线架YD/T 779-199923、地下通信管道用塑料管YD/T 841-199624、通信管道工程施工及验收技术规范 YDJ 39-9025、通信工程建设环境保护技术规定YD 5039-9726、中国公用计算机互联网工程设计暂行规定YD 5037-9727、公用计算机互联网工程验收规范YD 5070-9828、建筑与建筑群综合布线系统工程设计规范(修订本)CECS 72:9729、建筑与建筑群综合布线系统施工及验收规范CECS 89:971.2设计原则●实用性:系统设计根据大楼规划有的放矢,从实际需要出发,注重性价比。

综合布线系统标准

1 综合布线系统国际标准当前国际上主要的综合布线技术标准有北美标准TIA/EIA 568—B、国际标准ISO/IEC 11801: 2002和欧洲标准CELENEC EN 50173:20021.北美标准(1)TIA/EIA 568系列① TIA/EIA 568② ANSI/TIA/EIA 568 A(1995):定义5e类、引入了3dB原则③ TIA/EIA 568 B (2002):定义6类、引入永久链路④TIA/EIA 568 C (2009):正式定义6A类,引入外部串扰(2)TIA/EIA 569 A商业建筑电信通道和空间标准Ø569的目的是使支持电信介质和设备的建筑物内部和建筑物之间设计和施工标准化,尽可能地减少对厂商设备和介质的依赖性(3)TIA/EIA 570 A住宅电信布线标准Ø家居电信布线标准(4)TIA/EIA 606商业建筑电信基础设施管理标准Ø用于对布线和硬件进行标识,目的是提供一套独立于系统应用之外的统一管理方案(5)TIA/EIA 607商业建筑物接地和接线规范Ø这个标准的目的是规范建筑物内电信接地系统的规划、设计和安装2.国际标准综合布线国际标准主要是ISO/IEC 11801系列标准(1)ISO/IEC 11801:1995Ø定义到100MHz,定义了使用面积达100万平方米和5万个用户的建筑和建筑群的通信布线,建立了“级(Classes)”,即Class A,Class B,Class C,Class D等级的概念。

(2)ISO/IEC 11801:2000Ø定义了永久链路,对永久链路和通道的等效远端串扰ELFEXT、综合近端串扰和传输延迟进行了规定。

(3)ISO/IEC 11801:2002Ø定义了Cat6/Class E和Cat7/Class F类链路3.欧洲标准欧洲标准CELENEC EN50173(信息系统通用布线标准)与国际标准ISO/IEC 11801是一致的。

机房建设标准及规范

★设备间内所有设备应有足够的安装空间,其中包括计算机主机,网络连接设备等。

★设备间的地面面层材料应能防静电。

★设备间至少提供离地板255CM高度的空间,门的高度应大于210CM,门宽应大干90CM,地板的平均荷载应大于5kN/m2。

凡是安装综合布线硬件的地方,墙壁和天棚应涂阻燃漆。

★设备间应采用全封闭房间,防止有害气体(如SO2、H2S、NH3、NO2等)侵入,并应有良好的防尘措施。

★设备间室温应保持在10℃至25℃之间,相对温度应保持60%至80%。

★设备间应安装符合法规要求的消防系统,应使用防火防盗门,至少能耐火1小时的防火墙。

★机房内的尘埃要求低于0.5um;对于开机时机房内的噪音,在中央控制台处测量时应小于70dB。

★机房内无线电干扰场强,在频率范围为0.15—1000MHz时不大于120d B。

机房内磁场干扰场不大于800A/m。

★计算机房内的照明要求在离地面0.8m处,照度不应低于200lx,其它房间的照明不应低于5lx,主要通道及有关房间可根据需要设置,但其照度要求是在离地面0.8m处不低于1lx。

★设备间应采用UPS不间断电源,防止停电造成网络通讯中断。

UPS电源应提供不低于2小时后备供电能力。

UPS功率大小应根据网络设备功率进行计算,并具有20-30%的余量。

设备间电源设备应具有过压过流保护功能,已防止对设备的不良影响和冲击。

★防雷接地可单独接地或同大楼共用接地体。

接地要求每个配线柜都应单独引线至接地体,保护地线的接地电阻值,单独设置接地体时,不应大于2欧姆;采用同大楼共用接地体时,不应大于1欧姆。

机房建设所涉及系统★机房装修系统★机房布线系统(网络布线、电话布线、DDN、卫星线路等布线)★机房屏蔽、防静电系统(屏蔽网、防静电地板等)★机房防雷接地系统★机房保安系统(防盗报警、监控、门禁)★机房环境监控系统★机房专业空调通风系统★机房网络设备放置色设备(机柜、机架等)★机房照明及应急照明系统★机房UPS配电系统机房环境1.空调机房环境温湿度:温度:冬季:20±2℃夏季:23±2℃温度变化率≤5℃/h 相对湿度:50%±5%洁净度:符合标准ASHRAE52-76,粒度≥0.5mm,个数≤10000粒/dm 噪声:关闭主设备的条件下,在工作人员正常办公位置处测量不高于6 8dB(A).(GB)机房单位面积的冷负荷为:257w/m2h系统控制室单位时间换气数:≥23次/h数据中心机房单位时间换气数:≥22次/h2.防火防火系统基于以下原则建设:- 采用高灵敏度火灾自动报警系统;-采用环保型FM200气体灭火系统;FM-200气体火火系统保护区及存储环境温度为0~54℃,存储压力25kg/cm2-本气体灭火系统能以自动、机械手动和远程启动三种方式启动;设有备用电源,操作时间为24小时。

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TIA/EIA TELECOMMUNICATIONS SYSTEMS BULLETIN Transmission Performance Specifications for Field Testing of UnshieldedTwisted-Pair Cabling SystemsTSB67OCTOBER 1995TELECOMMUNICATIONS INDUSTRY ASSOCIATIONNOTICETIA/EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of TIA/EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than TIA/EIA members, whether the standard is used either domestically or internationally.Standards, Publications and Bulletins are adopted by TIA/EIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Publication or Bulletin.Technical Bulletins are distinguished from TIA/EIA Standards and Interim Standards, in that they contain a compilation of engineering data or information useful to the technical community, and represent approaches to good engineering practices that are suggested by the formulating committee.This Bulletin is not intended to preclude or discourage other approaches that similarly represent good engineering practice, or that may be acceptable to, or have been accepted by, appropriate bodies. Parties who wish to bring other approaches to the attention of the formulating committee to be considered for inclusion in future revisions of this Bulletin are encouraged to do so. It is the intention of the formulating committee to revise and update this Bulletin from time to time as may be occasioned by changes in technology, industry practice, or government regulations, or for other appropriate reasons.(From Project No. 3287, formulated under the cognizance of the TIA TR-41.8 Subcommittee on Commercial and Residential Building a Building Cabling Systems.)Published byTELECOMMUNICATIONS INDUSTRY ASSOCIATION 1995Standards and Technology Department2500 Wilson BoulevardArlington, VA 22201PRICE: Please refer to the currentCatalog of EIA, JEDEC and TIA STANDARDS and ENGINEERING PUBLICATIONS or call Global Engineering Documents, USA and Canada (1-800-854-7179)International (303)397-7956)All rights reservedPrinted in the U.S.A.PLEASE!DON'T VIOLATE THE LAW!This document is copyrighted by the TIA and may not be reproduced without permission. Organizations may obtain permission to reproduce a limited number of copies through entering into a license agreement. For information, contact:Global Engineering Documents15 Inverness Way EastEnglewood, CO 80112-5704 or callU.S.A. and Canada 1-800-854-7179, International (303)397-7956ANSI/TIA/EIA-569-AForeword(This foreword is not part of this Standard)This Standard was produced by TIA/EIA Working Group TR-41.8.3 and was a joint effort between the U.S. and Canada, with the Canadian Standards Association publishing the Canadian equivalent of this Standard (CSA T530) at approximately the same time.Approval of StandardThis Standard was approved by TIA/EIA Working Group TR-41.8.3, TIA/EIA Sub committee TR-41.8, TIA/EIA Technical Committee TR-41, and the American National Standards Institute (ANSI). Contributing organizationsMore than 30 organizations within the telecommunications industry contributed their expertise to the development of this Standard (including manufacturers, consultants, end users, and other organizations).The initial development of the standard was carried out with the support of the American Institute of Architects and the Construction Specifications Institute. Because this standard greatly influences both the design and construction of commercial buildings, it was important that these two organizations were cognizant of this particular standards activity. Additionally, the prospect of the architectural and construction industries being confronted with a national standard related to access to telecommunications services made it necessary that they be given a clear rationale for the need of such a standard. Documents supersededThis Standard replaces the first edition of ANSI/EIA/TIA-569, originally published October, 1990. Significant technical changes from previous editionTerminology changes:--Work station has been replaced by work area. This change harmonizes use of terminology across all telecommunications infrastructure standards (ANSI/TIA/EIA-568-A, -569-A, -606 and -607).--Conduit dimensions have been replaced by their respective electrical trade-size nomenclature.For example, 21 (¾) trade size conduit refers to a conduit with a metric trade designator of 21and an English trade designator of ¾. Units (mm, in) are not included with the designator it isunderstood that the metric designator is in millimeters and the English designator is in inches. A table is located in annex B showing trade-size designators and their corresponding dimensions.--Manhole has been replaced by maintenance hole to degenderize the term.--Maintenance holes, handholes, pull boxes, and splice boxes are now considered spaces for the purposes of this Standard to harmonize with the administration standard (ANSI/TIA/EIA-606). Technical global changes:--Grounding and bonding requirements have been harmonized with ANSI/TIA/EIA-607 throughoutthis Standard.--Administrative requirements have been referenced to ANSI/TIA/EIA-606.Highlights of changes made to the various sections:--Foreword:This foreword section has been changed per the requirements of the TIA stylemanual.--Section 3:All definitions have been harmonized across all telecommunications infrastructure standards.--Section 4:Transition box sizing has changed. Backbone-related information has beenmoved to sections 5 and normative annex C. Consolidation points and multi-usertelecommunications outlet assemblies have been added.--Section 5:Only intrabuilding backbone pathways and spaces are now considered.--Section 6:Pathway and space requirements for open office cabling are now included.--Section 7:The telecommunications closet diagram is changed.--Section 8:Floor loading and vibration requirements for equipment rooms have changed.Additionally, requirements for a main terminal space have been added.--Section 9:All interbuilding requirements have been moved to normative annex C.--Section 10:Pathway separation from EMI sources has significant changes.--The firestopping annex has been significantly modified and changed from an informative to a normative annex.--The Symbols annex was removed because ANSI/TIA/EIA-606 includes symbols.-- A new normative annex C was created, placing all material related to interbuilding pathway/space topics under one heading. It is the intent of TR-41.8.3 to remove this annex at a later date, after TIA issues a new standard covering the same material (tentatively, a standard on outside plant).NOTE -Pathway fill is under study by TR-41.8.3.Relationship to other standards and documentsThis Standard is a member of a family of standards related to the telecommunications infrastructure supporting modern commercial buildings. Other standards within this family are--Commercial Building Telecommunications Cabling Standard (ANSI/TIA/EIA-568-A);--Residential and Light Commercial Telecommunications Wiring Standard (ANSI/EIA/TIA-570);--Administration Standard for the Telecommunications Infrastructure of Commercial Buildings ( ANSI/TIA/EIA-606);--Commercial Building Grounding and Bonding Requirements for Telecommunications ( ANSI/TIA/EIA-607).A useful supplement to this Standard is the Building Industry Consulting Service International (BICSI) Telecommunications Distribution Methods Manual. This manual provides practices and methods by which many of the requirements of this Standard are implemented.The National Electrical Code (ANSI/NFPA-70) contains requirements for telecommunications pathways within buildings that govern the use of this Standard.Other references are listed in annex D.The following list may be useful to the reader in acquiring safety and other additional code-related information:a)American Insurance Association:National Building Code (NBC)b)Building Officials and Code Administrators (BOCA):The BOCA Basic Building Codec)Institute of Electrical & Electronics Engineers (IEEE):National Electrical Safety Coded)International Conference of Building Officials (ICBO):Uniform Building Code (UBC)e)National Fire Protection Association (NFPA):1)Automatic Fire Detectors2)Auxiliary Protective Signaling Systems3)Central Station Signaling Systems4)Life Safety Code5)Lightning Protection Code6)Local Protective Signaling Systems7)National Electrical Code (NEC)8)Remote Station Protective Signaling Systems9)Proprietary Protective Signaling Systems10)Protection of Electronic Computer/Data Processing Equipmentf)Southern Building Code Congress International, Inc.:Standard Building Code (SBC)This Standard does not replace any code, either partially or wholly. The reader should also be aware of local codes which may impact the use of this Standard.AnnexesAnnexes A and C of this Standard are normative and considered a mandatory part of this Standard. Annexes B and D are informative and not considered a mandatory part of this Standard.ANSI/TIA/EIA-569-A Commercial Building Standards for Telecommunications Pathways and SpacesContentsTitle PageForeword1_Introduction2_Scope3_Definitions, abbreviations and acronyms, units4 _Horizontal pathways and related spaces5_Intrabuilding backbone pathways and related spaces6_Work area7_Telecommunications closet8 _Equipment room9_Entrance facilities10_Miscellaneous itemsAnnex A (normative) FirestoppingAnnex B (informative) Additional section informationAnnex C (normative) Interbuilding backbone pathways and related spaces Annex D (informative) ReferenceFiguresTablesANSI/TIA/EIA-569-A Commercial Building Standards for Telecommunications Pathways and SpacesContentsTitle PageForeword1_Introduction1.1_General1.2_Purpose1.3_Expected usefulness1.4_Relation to other organizations1.5_Mandatory, advisory terms1.6_Metric equivalents of U.S. customary units1.7_Life of this Standard2_Scope2.1_General2.2_Basic building elements2.3_Normative references3_Definitions, abbreviations and acronyms, units3.1_Definitions3.2_Abbreviations and acronyms3.3_Units4 _Horizontal pathways and related spaces4.1_General4.2_Underfloor pathways4.3_Access floor4.4 Conduit444.5_Cable trays and wireways4.6_Ceiling pathway4.7_Perimeter pathways4.8_Miscellaneous5_Intrabuilding backbone pathways and related spaces5.1_General5.2_Design guidelines6_Work area6.1_General6.2_Telecommunications outlet locations6.3_Furniture pathways and spaces6.4_Control center, attendant, and reception areas 7_Telecommunications closet7.1_General7.2_Design considerations8 _Equipment room8.1_General8.2 _Design considerations8.3_Main terminal space9_Entrance facilities9.1_General9.2 _Entrance location considerations9.3_Service entrance pathway9.4_Entrance point9.5_Entrance room or space10_Miscellaneous items10.1_Firestopping10.2_Elevator telecommunications10.3_Horizontal pathway separation from EMI sourcesAnnex A (normative) FirestoppingA.1_ScopeA.2_Terminology and definitionsA.3_FirestopsA.4_Quality control considerationsA.5_Categories of firestop systemsA.6_Design consideration checklistAnnex B (informative) Additional section informationB.1_GeneralB.2_Horizontal pathwaysB.3_Smaller building telecommunications closetB.4_Requirements for equipment deliveryB.5_Grounding and bondingAnnex C (normative) Interbuilding backbone pathways and related spacesC.1_GeneralC.2 _Building site and entrance considerationsC.3_Interbuilding and entrance pathwaysC.4_General considerations for pathway typesC.5_Interbuilding pathway design considerationsC.6_Space design considerationsAnnex D (informative) ReferenceFiguresFigure 2.2-1_Intrabuilding elementsFigure 4.2-1_Single-level underfloor ductFigure 4.2-2_Two-level underfloor ductFigure 4.2-3_Flushduct underfloor systemFigure 4.2-4_Multichannel racewayFigure 4.2-5_Header duct closet terminationFigure 4.2-6_Underfloor duct layoutFigure 4.2-7_Steel cellular floorFigure 4.2-8_Concrete cellular floorFigure 4.2-9_Trenchduct cellular floorFigure 4.3-1_Typical access floorFigure 4.5-1_Ventilated cable trayFigure 4.5-2_Lay-in wirewayFigure 4.6-1_Typical utility columnFigure 4.6-2_Typical ceiling distribution systemFigure 4.7-1_Typical perimeter racewayFigure 4.8-1_Typical transition boxes in columnsFigure 5.2-1_Typical office building layoutFigure 5.2-2_Typical sleeve and slot installationsFigure 6.3-1_Dimensions for furniture telecommunications outlet opening Figure 7.2-1_Typical floor layoutFigure 7.2-2_Typical telecommunications closetFigure 9.3-1_Typical Underground EntranceFigure 9.4-1_Entrance conduit or sleeve terminationFigure 9.4-2_Encased entrance conduit terminationFigure A.5-1_Mechanical firestopsFigure B.3-1_Typical shallow closetFigure C.1-1_Typical interbuilding underground layoutFigure C.4-1_Typical Underground EntranceFigure C.4-2_Plate wall strapFigure C.4-3_Large cable entranceFigure C.4-4_Small cable entranceFigure C.4-5_Attachment unfinished buildingsFigure C.4-6_Typical tunnel sectionFigure C.5-1_Entrance conduit or sleeve terminationFigure C.5-2_Maximum section length between maintenance holes Figure C.6-1_Typical maintenance hole (Type A)Figure C.6-2_Typical handholeTablesTable 4.4-1_Conduit sizingTable 4.8-1_Transition box sizesTable 5.2-1_Conduit fill for backbone cableTable 5.2-2_Pull box sizingTable 5.2-3_Splice box sizingTable 7.2-1_Telecommunications closet sizeTable 8.2-1_Equipment room floor spaceTable 8.2-2_Contamination limitsTable 8.3-1_Minimum termination wall lengthTable 8.3-2_Minimum termination floor spaceTable B.1-1_Conduit dimensionsTable B.2-1_Performance criteria for dynamic loadingTable B.2-2_Performance criteria for static loadingTable C.5-1_Conduit fill for backbone cableANSI/TIA/EIA-569-AC OMMERCIAL B UILDING S TANDARD F OR T ELECOMMUNICATIONSP ATHWAYS A ND S PACES1Introduction1.1General1.1.1This Standard recognizes three fundamental concepts related to telecommunications and buildings:a)Buildings are dynamic.Over the life of a building, remodeling is more the rule than the exception. This Standardrecognizes, in a positive way, that change takes place.b)Building telecommunications systems and media are dynamic.Over the life of a building, both telecommunications equipment and media changedramatically. This Standard recognizes this fact by being as independent as possible fromspecific vendor equipment and media.c)Telecommunications is more than just voice and data.Telecommunications also encompasses many other building systems including environmental control, security, audio, television, sensing, alarms and paging. Indeed, telecommunicationsembraces all low voltage and power limited signal systems that convey information withinbuildings.1.1.2This Standard also recognizes an important precept: in order to have a building successfully designed, constructed, and provisioned for telecommunications, it is imperative that the telecommunications design be incorporated during the preliminary architectural design phase.1.1.3This Standard recognizes that floor space is occupied by each tenant, which usually occurs after the building has been build and provisioned, based on the requirements of this Standard. In a multitenant building the buildout design of the tenant space may include telecommunications pathways and spaces, in addition to the base building design, to accommodate distinct tenant needs. It is expected that, at the time of occupancy, each individual tenant will design their telecommunications cabling in conformance to ANSI/TIA-EIA-568-A. As a result, the buildout design may also include pathways and spaces to support a two-level backbone cabling hierarachy for each tenant.1.2PurposeThe purpose of this Standard is to standardize specific design and construction practices (in support of telecommunications media and equipment) within and between (primarily commercial) buildings. Standards are given for spaces (rooms or areas) and pathways into and through which telecommunications equipment and media are installed.1.3Expected usefulness1.3.1In recognition of the above fundamental concepts, a principal goal of this Standard is that it beuseful to those who matter the most the building owners and occupants who otherwise would live with the daily problems associated with buildings that are not properly designed and constructed to support telecommunications. A properly designed and constructed facility is adaptable to change over the life of the facility. Owners and occupants can assume that better facilities are constructed through the use of this Standard. Indeed, part of the expected usefulness of this Standard is that it be referenced in documents such as bid requests, specifications, and contracts leading up to the construction of facilities.1.3.2The Standard should also prove useful to the team that is responsible for delivering awell-designed facility to the owner the architects, engineers, and the construction industry. A good understanding of this Standard by this team will significantly reduce problems associated with the final product. Two team organizations, in particular, are lauded for their supportive role as this Standard was initially developed the American Institute of Architects (AIA) and the Construction Specifications Institute (CSI).1.3.3Other organizations will also benefit from an understanding of the Standard. In particular, the Building Owners and Managers Association (BOMA), the Building Industry Consulting Service International (BICSI), and the International Facility Management Association (IFMA) will find the Standard closely aligned with their goals for good building design and construction.1.3.4This Standard generally makes no specific recommendations among the design alternatives available for telecommunications pathways and spaces. For example, the choice between a conduit system vs. a tray system is not delineated. It is up to the telecommunications designer to properly select among the alternatives based upon the applications at hand and the constraints imposed. Readers, especially building end users and owners, should ensure that qualified designers of telecommunications pathways and spaces are selected.1.4Relation to other organizationsThe relationship of this Standard to both the American Institute of Architects (AIA) and the Construction Specifications Institute (CSI) has already been mentioned. A wealth of additional information related to buildings and this Standard is available from many other organizations including--Building Industry Consulting Service International (BICSI);--Building Owners and Managers Association (BOMA);-- International Facility Management Association (IFMA);-- National Electrical Manufacturers Association (NEMA);--National Research Council (NRC) - Building Research Board;--National Fire Protection Association (NFPA);--National Society of Professional Engineers (NSPE);--Underwriters Laboratory (UL).1.5Mandatory, advisory terms1.5.1In accordance with EIA Engineering Publication EP-7B (Ref D.13), two categories of criteria are specified: mandatory and advisory. The mandatory requirements are designated by the word "shall"; advisory requirements are designated by the words "should," "may," or "desirable" which are used interchangeably in this Standard.1.5.2Mandatory criteria generally apply to protection, performance and compatibility; they specify the absolute minimum acceptable requirements.1.5.3Advisory criteria represent above minimum requirement goals. In some instances, advisory criteria are included in an effort to ensure compatibility between equipment or media and facilities. In other cases, advisory criteria are presented when their attainment will enhance the general performance of the facility in all its contemplated applications.1.5.4Where both a mandatory and an advisory level are specified for the same criterion, the advisory level represents a goal currently identifiable as having distinct compatibility or performance advantages, or both, toward which future designs should strive.1.6Metric equivalents of U.S. customary unitsThe majority of metric dimensions in this Standard are soft conversions of U.S. customary units; e.g., 100 mm is the soft conversion of 4 in.1.7Life of this StandardThis Standard is a living document. The criteria contained in this Standard are subject to revision and updating as warranted by advances in building construction techniques and telecommunications technology.ANSI/TIA/EIA-569-A2Scope2.1General2.1.1The scope of this Standard is limited to the telecommunications aspect of commercial building design and construction, encompassing telecommunications considerations both within and between buildings. Telecommunications aspects are generally the pathways into which telecommunications media are placed and the rooms and areas associated with the building used to terminate media and install telecommunications equipment.2.1.2Both architectural and telecommunications terminology are used in this Standard, which may cause some difficulty to readers experienced in one area but perhaps not in the other. The reader can reduce confusion by remembering that this Standard does not standardize the media or equipment; it only standardizes the pathways and spaces within and between buildings into which telecommunications media and equipment are placed.2.1.3Although the scope is limited only to the telecommunications aspect of building design, this Standard significantly influences the design of other building services, such as electrical power and HVAC. This Standard also impacts space allocation within the building.2.1.4This Standard does not cover safety aspects of building design; the reader is directed to the introduction of this Standard for safety and building code references. Other codes and standards may also apply to the installation of telecommunications pathways and spaces.2.1.5This Standard does not cover any telecommunications systems that require any special types of security measures.2.1.6Both single- and multitenant buildings are recognized by this Standard. Occupancy usually occurs after the base building has been constructed and provisioned, based on the requirements of this Standard; however, the distinct needs of individual tenants in a multitenant building may need to be accommodated by additional telecommunications pathway and space facilities beyond those provided in the base building design. It is expected that, at occupancy time, each individual tenant will design the telecommunications cabling in conformance to ANSI/TIA/EIA-568-A. As a result, the buildout design may also include pathways and spaces to support a two-level backbone cabling hierarchy for each tenant.2.2Basic building elements2.2.1Telecommunications has an impact on most every area within and between commercial buildings. Because of this and the additional fact that the useful life of a building may span many decades, it is very important that the design and construction of new or remodeled buildings be done to avoid obsolescence. Doing this properly means that the resulting building is responsive to the many normal changes that occur in both telecommunications media and systems over the life of the building. 2.2.2Figure 2.2-1 illustrates the relationships between the major telecommunications pathway and space elements within a building. The following list describes the global characteristics of each element; numbers are keyed to respective sections within this Standard:4Horizontal pathways and related spaces These facilities provide pathways for installation of media from the telecommunications closet destined for the work area telecommunications outlet/connector. A horizontal pathway facility can be composed ofseveral components including cable tray, conduit, underfloor, access floor, ceiling, and perimeter systems.5Intrabuilding backbone pathways and related spaces One or more backbone facilities may exist within a building. A backbone facility is generally formed by vertically stacking telecommunications closets with floor openings between them.Tie pathways may also exist to install backbone media between telecommunications closets on the same floor.6Work area A work area is a building space where the occupant normally interacts withtelecommunications equipment. The telecommunications outlet/connectorin the work area is the point at which end-user equipment "plugs into" thebuilding telecommunications utility formed by the pathway, space, andbuilding cabling system.7Telecommunicationscloset A telecommunications closet is a floor-serving facility for housing telecommunications equipment, cable terminations, and relatedcross-connections. The telecommunications closet is the recognized transition point between the backbone and horizontal pathway facilities.8Equipment room An equipment room serves the space needs for largertelecommunications equipment. These are often special-purpose rooms.Equipment rooms are connected to the backbone facility.9 Entrance facilities:Interbuilding backbone Pathway facilities to the entrance room or space provided forinterconnection to other buildings, as in a campus environment.Service entrance pathway Pathway facilities to the entrance room or space provided at the entrancefacility for the service providers.Entrance point The point of emergence of telecommunications cabling into a buildingspace.Entrance room or space This space, preferably a room, is the building serving facility in which thejoining of inter- and intrabuilding backbone facilities takes place. Theservice entrance room may also house electronic equipment serving anytelecommunications function.Alternate entrance A pathway for the duplication or diversification of the service entrance andinterbuilding pathways.Antenna entrance A pathway facility to the associated entrance room.Figure 2.2-1Intrabuilding elements2.3Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them.--ANSI/TIA/EIA-568-A, Commercial building telecommunications cabling standard, 1995. (Ref D.5).--ANSI/TIA/EIA-606, Administration standard for the telecommunications infrastructure of commercial buildings, 1993. (Ref D.6).--ANSI/TIA/EIA-607, Commercial building grounding and bonding requirements for。

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