ANSI/TIA/EIA 568-B铜缆双绞线6类标准...

ANSI/TIA/EIA 568-B铜缆双绞线6类标准由ANSI/TIA/EIA 568-A标准演变而来，属于北美标准系列，一直起着综合布线产品的导向工作，经过十多个版本的修改定稿，终于在6月正式出台。 结构变化 新的568-B标准从结构上分为三部分：568-B1综合布线系统总体要求，568-B2平衡双绞线布线组件和568-B3光纤布线组件。 568-B1综合布线系统总体要求：在新标准中，包含了电信布线系统设计原理，安装准则与现场测试相关的内容。 568-B2平衡双绞线布线组件：在新标准中，包含了组件规范、传输性能、系统模型和用于验证电信布线系统的测量程序相关内容。 568-B3光纤布线组件：在新标准中，包含了与光纤电信布线系统的组件规范和传输相关要求的内容。 关键新项目 568-B标准除了结构上的变化外，还增加了一些关键新项目。 新术语：术语“衰减”改为“插入损耗”，用于表示链路与信道上的信号损失量，电信间TC改为电信量TR。 介质类型：在水平电缆方面，为4对100Ω3类UTP或SCTP；4对100Ω超5类UTP或SCTP；4对100Ω6类UTP或SCTP；2条或多条62.5/125μm或50/125μm多模光纤。在主干电缆方面，为100Ω双绞线，3类或更高；62.5/125μm或50/125μm多模光纤；单模光纤。568B标准不认可4对4类和5类电缆。150 屏蔽双绞线是认可的介质类型，然而，不建议在安装新设备时使用。混合与多股电缆允许用于水平布线，但每条电缆都必须符合相应等级要求，并符合混合与多股电缆的特殊要求。 接插线、设备线与跳线：对于24AWG（0.51mm）多股导线组成的UTP跳接线与设备线的额定衰减率为20%，采用26AEG（0.4mm）导线的SCTP缆线的衰减率为50%。多股线缆由于具有更大的柔韧，建议用于跳接线装置。 距离变化：现在，对于UTP跳接线与设备线，水平永久链路的两端最长为5m（16英尺），以达到100m（328英尺）的总信道距离。对于二级干线，中间跳接到水平跳接（IC到HC）的距离减为300（984英尺）。从主跳接到水平跳接（MC到HC）的干线总距离仍遵循568-A标准的规定。中间跳接中与其它干线布线类型相连的设备线和跳接线不应超过20m（66英尺）改为不得超过20m（66英尺）。 安装规则：4对SCTP电缆在非重压条件下的弯曲半径规定为电缆直径的8倍。2股或4股光纤的弯曲半径在非重压条件下是25mm（1英寸），在拉伸过程中为50mm（2英寸）。电缆生产商应确定光纤主干线的弯曲半径要求。如果无法从生这商获得弯曲半径信息，则建筑物内部电缆在非重压条件下的弯曲半径是电缆直径的10倍，在重压条件下是15倍。2芯或4芯光纤的牵拉力是222N（501bf）。超5类双绞线开绞距离距端接点应保持在13mm（0.5英寸）以内，3类双绞线应保持在75mm（3英寸）以内。 永久链路替代基本链路 水平布线永久链路测试连接方式和测试指标要求永久链路方式供安装人员和数据电信用户用来认证永久安装电缆的性能，今后将替代基本链路方式。永久链路信道由90m水平电缆和1个接头，必要时再加1个可选转接/汇接头组成。永久链路配置不包括现场测试仪插接软线和插头，如图所示。 超5类及6类双绞线除了测试接线图、线缆链路长度、特性阻抗、直流环路电阻、衰减、近端串扰损耗外，还在各项测试参数上有一定区别。 传播时延 传播时延是传播信号延长时间。在确定通道和基本链路传播时延时，连接硬件的传播时延在1MHz至250MHz的范围内不超过2.5ns。所有各类通道配置的最大传播时延不超过10MHz下的555ns。所有各类基本链路配置的最大传播时延不超过100MHz下的518ns和250MHz下的于498ns。 延时偏移 延时偏移是最快线对与最慢线对发送信号延时差的尺度。对于安装每米的配备接线来说，延时偏移不超过1.25ns。对于所有各类通路配置的最大延时倾斜不大于50ns。所有各类链路配置的最大延时偏移不超过45ns。

北京万坤企业 · 发表于 2006-7-7 10:02:00

原文1：<table cellspacing="0" cellpadding="0" width="550" align="right" border="0"><tbody><tr valign="top"><td align="center" colspan="3">The Specification of Field Test Requirements for a Balanced Twisted-Pair Cabling System</td></tr><tr valign="top"><td colspan="3"></td></tr><tr valign="top"><td colspan="3">I. Cat 6 Installation: field test requirements upon completion of the installation</td></tr><tr valign="top"><td colspan="3"></td></tr><tr valign="top"><td colspan="3">A. General Requirements</td></tr><tr valign="top"><td width="18">1.</td><td colspan="2">Every cabling link in the installation shall be tested in accordance with the field test specifications defined in the most recent draft of the “Transmission Performance Specifications for 4-pair 100 ? Category 6 Cabling” under development by the Telecommunications Industry Association (TIA). At the time of this writing, PN-3727 TIA/EIA Draft Standard – Draft 7, dated August 23, 2000 represents the most recent version. This document will be referred to as the “TIA Cat 6 Draft Standard.”</td></tr><tr valign="top"><td width="18">2. </td><td colspan="2">The installed twisted-pair horizontal links shall be tested from the IDF in the telecommunications room to the telecommunication wall outlet in the work area against the “Permanent Link ” performance limits specification as defined in the TIA Cat 6 Draft Standard.</td></tr><tr valign="top"><td width="18">3. </td><td colspan="2">100% of the installed cabling links must be tested and must pass the requirements of the standards mentioned in I.A.2 above and as further detailed in Section I.B. Any failing link must be diagnosed and corrected. The corrective action shall be followed with a new test to prove that the corrected link meets the performance requirements. The final and passing result of the tests for all links shall be provided in the test results documentation in accordance with Section I.C below.</td></tr><tr valign="top"><td width="18">4. </td><td colspan="2">Trained technicians who have successfully attended an appropriate training program and have obtained a certificate as proof thereof shall execute the tests. Appropriate training programs include but are not limited to installation certification programs provided by BiCSi or the ACP (Association of Cabling Professionals).</td></tr><tr valign="top"><td width="18">5. </td><td colspan="2">The test equipment (tester) shall comply with the accuracy requirements for the proposed level III field testers as defined in the TIA Cat 6 Draft Document. The tester including the appropriate interface adapter must meet the specified accuracy requirements. The accuracy requirements for the permanent link test configuration (baseline accuracy plus adapter contribution) are specified in Table B.2 of Annex B of the TIA Cat 6 Draft Standard. (Table B.3 in this TIA document specifies the accuracy requirements for the Channel configuration.)</td></tr><tr valign="top"><td width="18">6.</td><td colspan="2">The tester shall be within the calibration period recommended by the vendor in order to achieve the vendor-specified measurement accuracy.</td></tr><tr valign="top"><td width="18">7. </td><td colspan="2">The tester interface adapters must be of high quality and the cable shall not show any twisting or kinking resulting from coiling and storing of the tester interface adapters. In order to deliver optimum accuracy, preference is given to a permanent link interface adapter for the tester that can be calibrated to extend the reference plane of the Return Loss measurement to the permanent link interface. The contractor shall provide proof that the interface has been calibrated within the period recommended by the vendor. To ensure that normal handling on the job does not cause measurable Return Loss change, the adapter cord cable shall not be of twisted-pair construction.</td></tr><tr valign="top"><td width="18">8. </td><td colspan="2">The Pass or Fail condition for the link-under-test is determined by the results of the required individual tests (detailed in Section I.B). Any Fail or Fail* result yields a Fail for the link-under-test. In order to achieve an overall Pass condition, the results for each individual test parameter must Pass or Pass*.</td></tr><tr valign="top"><td width="18">9.</td><td colspan="2">A Pass or Fail result for each parameter is determined by comparing the measured values with the specified test limits for that parameter. The test result of a parameter shall be marked with an asterisk (*) when the result is closer to the test limit than the accuracy of the field tester. The field tester manufacturer must provide documentation as an aid to interpret results marked with asterisks.</td></tr><tr valign="top"><td colspan="3"></td></tr><tr valign="top"><td colspan="3">Optional Requirements:</td></tr><tr valign="top"><td width="18">10. </td><td colspan="2">A representative of the end-user shall be invited to witness field testing. The representative shall be notified of the start date of the testing phase 5 business days before testing commences.</td></tr><tr valign="top"><td width="18">11.</td><td colspan="2">A representative of the end-user will select a random sample of 5% of the installed links. The representative (or his authorized delegate) shall test these randomly selected links and the results are to be stored in accordance with the prescriptions in Section I.C. The results obtained shall be compared to the data provided by the installation contractor. If more than 2% of the sample results differ in terms of the pass/fail determination, the installation contractor under supervision of the end-user representative shall repeat 100% testing and the cost shall be borne by the installation contractor.</td></tr></tbody></table>

北京万坤企业 · 发表于 2006-7-7 10:04:00

原文2：<table cellspacing="0" cellpadding="0" width="550" align="right" border="0"><tbody><tr valign="top"><td colspan="3">B. Performance Test Parameters</td></tr><tr valign="top"><td colspan="3"> </td></tr><tr valign="top"><td colspan="3">The test parameters for Cat 6 are defined in TIA Cat 6 Draft standard, which refers to the TIA/EIA-568-B.2 standard. The test of each link shall contain all of the following parameters as detailed below. In order to pass the test all measurements (at each frequency in the range from 1 MHz through 250 MHz) must meet or exceed the limit value determined in the above-mentioned draft standard.</td></tr><tr valign="top"><td colspan="3">[Optional Requirement – can only be combined with option (a) in Section I.C.6.] Each parameter shall be measured from 1 through 350 MHz and all of these measurement points are to recorded in the test results information as detailed in Section I.C.6.</td></tr><tr valign="top"><td width="18">1. </td><td colspan="2">Wire Map Wire Map shall report Pass if the wiring of each wire-pair from end to end is determined to be correct. The Wire Map results shall include the continuity of the shield connection if present.</td></tr><tr valign="top"><td width="18">2. </td><td colspan="2">Length The field tester shall be capable of measuring length of all pairs of a basic link or channel based on the propagation delay measurement and the average value for NVP ( 1 ). The physical length of the link shall be calculated using the pair with the shortest electrical delay. This length figure shall be reported and shall be used for making the Pass/Fail decision. The Pass/Fail criteria are based on the maximum length allowed for the Permanent Link configuration (90 meters – 295 feet) plus 10% to allow for the variation and uncertainty of NVP.</td></tr><tr valign="top"><td width="18">3. </td><td colspan="2">Insertion Loss (Attenuation) Insertion Loss is a measure of signal loss in the permanent link or channel. The term “Attenuation” has been used to designate “Insertion Loss.” Insertion Loss shall be tested from 1 MHz through 250 MHz in maximum step size of 1 MHz. It is preferred to measure insertion loss at the same frequency intervals as NEXT Loss in order to provide a more accurate calculation of the Attenuation-to-Crosstalk ratio (ACR) parameter. Minimum test results documentation (summary results): Identify the worst wire pair (1 of 4 possible). The test results for the worst wire pair must show the highest attenuation value measured (worst case), the frequency at which this worst case value occurs, and the test limit value at this frequency</td></tr><tr valign="top"><td width="18">4.</td><td colspan="2">NEXT Loss Pair-to-pair near-end crosstalk loss (abbreviated as NEXT Loss) shall be tested for each wire pair combination from each end of the link (a total of 12 pair combinations). This parameter is to be measured from 1 through 250 MHz. NEXT Loss measures the crosstalk disturbance on a wire pair at the end from which the disturbance signal is transmitted (near-end) on the disturbing pair. The maximum step size for NEXT Loss measurements shall not exceed the maximum step size defined in the draft standard as shown in Table 1, column 2. Minimum test results documentation (summary results): Identify the wire pair combination that exhibits the worst case NEXT margin ( 2 ) and the wire pair combination that exhibits the worst value of NEXT (worst case). NEXT is to be measured from each end of the link-under-test. These wire pair combinations must be identified for the tests performed from each end. Each reported case shall include the frequency at which it occurs as well as the test limit value at this frequency.</td></tr><tr valign="top"><td colspan="3"><table cellspacing="0" cellpadding="0" width="80%" align="center" border="1"><tbody><tr align="center"><td>Frequency Range (MHz)</td><td>Maximum Step size (MHz)</td></tr><tr align="center"><td>1 – 31.25</td><td>0.15</td></tr><tr align="center"><td>31.26 – 100</td><td>0.25</td></tr><tr align="center"><td>100 – 250</td><td>0.50</td></tr><tr align="center"><td>250 – 350</td><td>—</td></tr></tbody></table></td></tr><tr valign="top"><td width="18">5. </td><td colspan="2">PSNEXT Loss Power Sum NEXT Loss shall be evaluated and reported for each wire pair from both ends of the link-under- test (a total of 8 results). PSNEXT Loss captures the combined near-end crosstalk effect (statistical) on a wire pair when all other pairs actively transmit signals. Like NEXT this test parameter must be evaluated from 1 through 250 MHz and the step size may not exceed the maximum step size defined in the draft standard as shown in Table 1, column 2. Minimum test results documentation (summary results): Identify the wire pair that exhibits the worst case margin and the wire pair that exhibits the worst value for PSNEXT. These wire pairs must be identified for the tests performed from each end. Each reported case shall include the frequency at which it occurs as well as the test limit value at this frequency.</td></tr><tr valign="top"><td width="18">6.</td><td colspan="2">ELFEXT Loss, pair-to-pair Pair-to-pair FEXT Loss shall be measured for each wire-pair combination from both ends of the link-under-test. FEXT Loss measures the crosstalk disturbance on a wire pair at the opposite end (far-end) from which the transmitter emits the disturbing signal on the disturbing pair. FEXT is measured to compute ELFEXT Loss that must be evaluated and reported in the test results. ELFEXT measures the relative strength of the far-end crosstalk disturbance relative to the attenuated signal that arrives at the end of the link. This test yields 24 wire pair combinations. ELFEXT is to be measured from 1 through 250 MHz and the maximum step size for FEXT Loss measurements shall not exceed the maximum step size defined in the draft standard as in Table 1, column 2. Minimum test results documentation (summary results): Identify the wire pair combination that exhibits the worst case margin and the wire pair combination that exhibits the worst value for ELFEXT. These wire pairs must be identified for the tests performed from each end. Each reported case shall include the frequency at which it occurs as well as the test limit value at this frequency.</td></tr><tr valign="top"><td width="18">7. </td><td colspan="2">PSELFEXT Loss Power Sum ELFEXT is a calculated parameter that combines the effect of the FEXT disturbance from three wire pairs on the fourth one. This test yields 8 wire-pair combinations. Each wire-pair is evaluated from 1 through 250 MHz in frequency increments that do not exceed the maximum step size defined in the draft standard as shown in Table 1, column 2. Minimum test results documentation (summary results): Identify the wire pair that exhibits the worst case margin and the wire pair that exhibits the worst value for PSELFEXT. These wire pairs must be identified for the tests performed from each end. Each reported case shall include the frequency at which it occurs as well as the test limit value at this frequency</td></tr><tr valign="top"><td width="18">8.</td><td colspan="2">Return Loss Return Loss (RL) measures the total energy reflected on each wire pair. Return Loss is to be measured from both ends of the link-under-test for each wire pair. This parameter is also to be measured form 1 through 250 MHz in frequency increments that do not exceed the maximum step size defined in the draft standard as shown in Table 1, column 2. Minimum test results documentation (summary results): Identify the wire pair that exhibits the worst case margin and the wire pair that exhibits the worst value for Return Loss. These wire pairs must be identified for the tests performed from each end. Each reported case shall include the frequency at which it occurs as well as the test limit value at this frequency.</td></tr><tr valign="top"><td width="18">9. </td><td colspan="2">ACR (Attenuation to crosstalk ratio) [This parameter is not demanded by the draft standard but may be required in order to obtain the premise wiring manufacturer’s warranty] ACR provides an indication of bandwidth for the two wire-pair network applications. ACR is a computed parameter that is analogous to ELFEXT and expresses the signal to noise ratio for a two wire-pair system. This calculation yields 12 combinations – six from each end of the link. Minimum test results documentation (summary results): Identify the wire pair combination that exhibits the worst case margin and the wire pair combination that exhibits the worst value for ACR. These wire pair ombinations must be identified for the tests performed from each end. Each reported case shall include the frequency at which it occurs as well as the test limit value at this frequency.</td></tr><tr valign="top"><td width="18">10. </td><td colspan="2">PSACR [This parameter is not required by the draft standard but may be required in order to obtain the premise wiring vendor's warranty] The Power Sum version of ACR is based on PSNEXT and takes into account the combined NEXT disturbance of all adjacent wire pairs on each individual pair. This calculation yields 8 combinations - one for each wire pair from both ends of the link. Minimum test results documentation (summary results): Identify the wire pair that exhibits the worst case margin and the wire pair that exhibits the worst value for PSACR. These wire pairs must be identified for the tests performed from each end. Each reported case shall include the frequency at which it occurs as well as the test limit value at this frequency.</td></tr><tr valign="top"><td width="18">11.</td><td colspan="2">Propagation Delay Propagation delay is the time required for the signal to travel from one of the link to the other. This measurement is to be performed for each of the four wire pairs. Minimum test results documentation (summary results): Identify the wire pair with the worst case propagation delay. The report shall include the propagation delay value measured as well as the test limit value.</td></tr><tr valign="top"><td width="18">12.
</td><td colspan="2">Delay Skew [as defined in TIA/EIA-568-B.1; Section 11.2.4.11] This parameter shows the difference in propagation delay between the four wire pairs. The pair with the shortest propagation delay is the reference pair with a delay skew value of zero. Minimum test results documentation (summary results): Identify the wire pair with the worst case propagation delay (the longest propagation delay). The report shall include the delay skew value measured as well as the test limit value.</td></tr></tbody></table>

北京万坤企业 · 发表于 2006-7-7 10:05:00

原文3：<table cellspacing="0" cellpadding="0" width="550" align="right" border="0"><tbody><tr valign="top"><td colspan="3">C. Test Result Documentation</td></tr><tr valign="top"><td width="18">1.</td><td colspan="2">The test results information for each link shall be recorded in the memory of the field tester upon completion of the test.</td></tr><tr valign="top"><td width="18">2. </td><td colspan="2">The test results records saved by the tester shall be transferred into a Windows-based database utility that allows for the maintenance, inspection and archiving of these test records. A guarantee must be made that the measurement results are transferred to the PC unaltered, i.e., “as saved in the tester”at the end of each test and that these results cannot be modified at a later time. Superior protection in this regard is offered by testers that transfer the numeric measurement data from the tester to the PC in a non-printable format.</td></tr><tr valign="top"><td width="18">3. </td><td colspan="2">The database for the completed job shall be stored and delivered on CD-ROM including the software tools required to view, inspect, and print any selection of test reports.</td></tr><tr valign="top"><td width="18">4.</td><td colspan="2">A paper copy of the test results shall be provided that lists all the links that have been tested with the following summary information <table cellspacing="0" cellpadding="0" width="100%" border="0"><tbody><tr><td valign="top" width="3%">a) </td><td width="97%">The identification of the link in accordance with the naming convention defined in the overall
system documentation</td></tr><tr><td valign="top" width="3%">b) </td><td width="97%">The overall Pass/Fail evaluation of the link-under-test including the NEXT Headroom (overall worst case) number</td></tr><tr><td width="3%">c)</td><td width="97%">The date and time the test results were saved in the memory of the tester</td></tr></tbody></table></td></tr><tr valign="top"><td width="18">5.</td><td colspan="2">General Information to be provided in the electronic data base with the test results information for each link:
<table cellspacing="0" cellpadding="0" width="100%" border="0"><tbody><tr><td width="3%">a)</td><td width="97%">The identification of the customer site as specified by the end-user</td></tr><tr><td valign="top" width="3%">b)</td><td width="97%">The identification of the link in accordance with the naming convention defined in the overall system documentation</td></tr><tr><td width="3%">c)</td><td width="97%">The overall Pass/Fail evaluation of the link-under-test</td></tr><tr><td width="3%">d)</td><td width="97%">The name of the standard selected to execute the stored test results</td></tr><tr><td valign="top" width="3%">e)</td><td width="97%">The cable type and the value of NVP used for length calculations</td></tr><tr><td width="3%">f)</td><td width="97%">The date and time the test results were saved in the memory of the tester</td></tr><tr><td width="3%">g)</td><td width="97%">The brand name, model and serial number of the tester</td></tr><tr><td width="3%">h)</td><td width="97%">The identification of the tester interface</td></tr><tr><td width="3%">i)</td><td width="97%">The revision of the tester software and the revision of the test standards database in the tester</td></tr><tr><td valign="top" width="3%">j) </td><td width="97%">The test results information must contain information on each of the required test parameters that are listed in Section I.B and as further detailed below under paragraph I.C.6.</td></tr></tbody></table></td></tr><tr valign="top"><td width="18" rowspan="3">6. </td><td colspan="2">The detailed test results data to be provided in the electronic database for each tested link must contain the following information (only one of these two formats must be specified):</td></tr><tr valign="top"><td width="14">a)</td><td width="518">For each of the frequency-dependent test parameters, the value measured at every frequency during the test is stored. In this case, the PC-resident database program must be able to process the stored results to display and print a color graph of the measured parameters. The PC-resident software must also provide a summary numeric format in which some critical information is provided numerically as defined by the summary results (minimum numeric test results documentation) as outlined above for each of the test parameters. Length: Identify the wire-pair with the shortest electrical length, the value of the length rounded to the nearest 0.5 m [optional: foot] and the test limit value Propagation delay: Identify the pair with the shortest propagation delay, the value measured in nanoseconds (ns) and the test limit value Delay Skew: Identify the pair with the largest value for delay skew, the value calculated in nanoseconds (ns) and the test limit value Attenuation: Minimum test results documentation as explained in Section I.B for the worst pair Return Loss: Minimum test results documentation as explained in Section I.B for the worst pair as measured from each end of the link NEXT, ELFEXT, ACR: Minimum test results documentation as explained in Section I.B for the worst pair combination as measured from each end of the link PSNEXT, PSELFEXT, and PSACR: Minimum test results documentation as explained in Section I.B for the worst pair as measured from each end of the link</td></tr><tr valign="top"><td width="14">b)</td><td width="518">For each of the frequency-dependent test parameters, the minimum test results documentation shall be stored for each wire-pair or wire-pair combination as observed from each end of the link. The minimum test results documentation for each test parameter shall be in compliance with the information in Section I.B. Link length, propagation delay, and delay skew shall be reported for each wire pair as well as the test limit for each of these parameters</td></tr></tbody></table>

46yuanjie · 发表于 2006-7-14 13:17:00

有没有中文版本的，有的话麻烦楼主发一下<a href="mailto:46yuanjie@163.com">46yuanjie@163.com</a>

lg_168 · 发表于 2010-7-12 13:03:00

我需要中文版的，楼主有吗？请发给我！谢谢！
<a href="mailto:laoguai_168@163.com">laoguai_168@163.com</a>

hzqqboy · 发表于 2010-7-12 14:15:00

小弟不才，~看不懂

liluzhi · 发表于 2010-7-15 21:51:00

大概看明白了

综合布线(Cabling) 今日: 6301 |主题: 37622

ANSI/TIA/EIA 568-B铜缆双绞线6类标准...

已有7人评论