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福祿克DTX-1800測試報告ACR-N顯示不適用N/A，而不是通過PASS

深圳連訊 — Wed, 20 Apr 2016 03:07:14 +0000

福祿克DTX-1800測試報告中ACR-N顯示N/A，而不是PASS或者Fail，如下圖所示：（在Linkware軟件測試報告中的其他設(shè)備同理）

如果你正在測試任何ANSI/TIA標準，你將會總是看到N/A出現(xiàn)在ACR-N測試指標欄目里面，因為ACN-N不是ANSI/TIA要求測試參數(shù)。但是因為許多客戶比較關(guān)注ACR-N這個指標，所以福祿克在測試的時候，會測試這個參數(shù)，并且標注出來，為了特別工程師的需求。

值得一提的是ISO/IEC標準是需要測試ACR-N的。ISO/IEC標準測試出現(xiàn)N/A的時候，一般是使用永久鏈路進行測試時候，并且插入損耗小于4db。通道測試就不會。

總結(jié)：

這個沒有對不對，你的設(shè)備（DTX-1800）測試只是根據(jù)你選擇的標準來判斷的?？傮wPASS就是合格。

ACR-N顯示“I” ，Linkware軟件顯示N/A不適用（DTX-1800和DSX5000）

深圳連訊 — Thu, 24 Sep 2015 02:58:22 +0000

ACR-N shows N/A, not PASS or FAIL in LinkWare（In The DTX-1800 OR DSX-5000 show “I”

In LinkWare, you may see ACR-N appear with N/A next to it rather than a?PASS or FAIL. An example is shown below:

If you are testing to any ANSI/TIA standard, you will always see N/A (Not?Applicable) next to ACR-N since ACR-N is not a requirement in ANSI/TIA standards. It is however reported because many customers expect to see ACR-N on the test report. The limit line on the graph should ideally be black and not red; an enhancement request has been made to engineering.

ISO/IEC standards do require ACR-N. However,?you may also see N/A appear if the Insertion Loss of the disturbed pair is less than 4 dB for the entire measurement frequency; often referred to as the 4 dB rule. It only applies to ISO/IEC Permanent Link testing and NOT Channel testing.

Conclusion
There is no corrective action for you to take. Your tester and LinkWare are following the standard you selected.