国产精品岛国久久久久-国产精品第-国产精品第13页-国产精品第1页在线观看-国产精品第44页-国产精品第5页

洞察行業資訊 分享專業知識

洞察行業資訊 分享專業知識

洞察行業資訊 分享專業知識

洞察行業資訊 分享專業知識

聯系我們

  • 全國統一服務熱線：

    134 1039 1245
    400-996-0787
    0755-8399 9818

  • 聯系郵箱：

    sales@faxytech.com

  • 聯系地址：

    深圳市福田區華強北路華聯發大廈602室

3dB原則(法則) – DTX-1800/DSX2-8000 CableAnalyzer

A YouTube video explaining how this this works is also?available from here.


This is applicable to ALL test limits in the DTX CableAnalyzer where a Return Loss measurement is made.


When?the Insertion Loss is less than 3.0 dB at the frequency point where the measurement is made, then the Return Loss measurement is ignored and not uated against the selected Test Limit/Cabling Standard in the DTX CableAnalyzer.This is often referred to as the?3 dB rule.It applies to ALL cabling standards/test limits in the DTX CableAnalyzer.


On a short?link,the Insertion Loss may never reach 3.0 dB.If that were to happen, then the entire measurement would be?ignored, or as the cabling standards phrase it; “recorded for information only”.If this were to happen with your DTX CableAnalyzer, you would see an “i” appear next to the summary result for that test parameter.In LinkWare software, the result would be recorded with “N/A’.An example is shown below:


1.gif


Concern is normally caused when the result has a negative margin.In this example we see the Return Loss margin was -2.2. A?negative margin is normally associated with a FAIL, but because the entire link never exceeded 3.0 dB Insertion Loss, it is not a FAIL.


Let’s review in detail how this works by looking at another example test result.


A TIA Cat 5e Perm.Link AUTOTEST was run on a 29.0 m installed link, giving the following result:


2.gif


Looks normal – very nice margins.Let’s take a look at the Return Loss result in a little more detail:


3.gif


You will observe that?the limit line has two colors, black and red.The cabling standards do not require the cable tester manufacturer to display where the?3 dB rule is implemented to the user, only that it is implemented.However, the DTX CableAnalyzer will indicate where the 3 dB rule has been implemented by changing the color of the limit line.If the?limit line is black, it?indicates that the Insertion Loss was less than 3.0 dB.If the?limit line is red, the Insertion Loss was 3.0 dB or greater.So for this Pair 3,6 the Return Loss?is not uated below 29.3 MHz. Let’s take a quick look at the Insertion Loss for Pair 3,6:


4.gif


As you can see, the Insertion Loss reached 3.0 dB at 29.3 MHz, as previously indicated in the Return Loss Pair 3,6 graph above.


It’s an interesting rule, because if it were not in place, our margin for the above result would reduce from 10.2 dB to 9.0 dB:


5.gif


As previously mentioned, if the link is particularly short, then the Insertion Loss may never reach 3.0 dB and the entire Return Loss?result is “ignored”.Let’s take a closer look at the first example where the test result was:


6.gif


Looking at the worst case Return Loss result, we see the entire limit line is black, suggesting that the Insertion Loss for Pair?3,6 never reached 3.0 dB:


7.gif


Looking at the Insertion Loss for Pair 3,6:


8.gif


We see that the Insertion did indeed never reach 3.0 dB, so the entire measurement is not uated against the limit line (ignored) and recorded as “i” Information Only.If this result was downloaded to LinkWare Software, the report would show N/A against this measurement:


9.gif


No further action is required by the installer.This is a valid standards compliant result.


相關配件（）
主站蜘蛛池模板： www.毛片com| 天天操2021| 四虎新地址4hu 你懂的| 日本人xxxxxxx中国| 男人av的天堂| 久操视频在线免费观看| 国产日产欧美a级毛片| 97国产免费全部免费观看| 亚洲一级毛片免费在线观看| 色花堂国产精品第二页| 欧美成人精品一区二区三区| 精品国产精品久久一区免费式| 国产精品大片天天看片| 99热久久精品首页| 亚洲国产另类久久久精品小说| 奇米影视777第四色| 久久一区视频| 国产精品第一区亚洲精品| 中文一区| 亚洲va欧美va国产va天堂影| 欧美一级毛片一| 久久福利资源网站免费看| 国产精品亚洲综合第一区| 中文字幕久久久久一区| 中文日本在线| 四虎影视在线观看2022a| 欧洲一级| 黄色免费看视频| 成人免费观看视频久爱网| 在线播放福利| 天天操网| 看全色黄大色大片免费久久久| 国产这里有精品| 播五月| 一机毛片| 色精品一区二区三区| 久久久久久综合| 国产精品亚洲综合色区韩国| 伊人网2021| 四虎永久精品免费网址大全| 久热操|