專注福祿克測試儀銷售與技術

fluke DSX-5000中TCL與ELTCTL是什么意思？測試不過怎么辦？

福祿克DSX-5000中國區代理深圳市連訊達電子技術開發有限公司福祿克網絡部工程師為大家TCL與ELTCTL兩個參數的意思。(PS:這是DTX-1800里面沒有的參數）

transverse conversion loss  TCL 橫向變換損耗
transverse conversion transfer loss  TCTL 橫變換轉移損耗
TCL (Transverse Conversion Loss) – DSX CableAnalyzer TCL is one of two balance measurements found in ANSI/TIA-568-C.2, ANSI/TIA-1005 and ISO/IEC 11801:2010. The other is ELTCTL.

The measurement is made by injecting a differential mode signal (DM) into a twisted pair, then measuring the common mode signal (CM) returned on that same twisted pair. The smaller the CM signal returned, the better the TCL measurement (balance).
 
翻譯：測量是通過向雙絞線注入差模信號（DM），然后測量同一對雙絞線返回的共模信號（CM）。CM信號返回的越少，TCL參數就會越好，越平衡。

If it looks similar to a Return Loss measurement, you're right. Except a Return Loss measurement is made by injecting a DM signal into the pair and measuring the DM signal returned. Here we are measuring the CM signal returned which is TCL.

翻譯：如果你覺得它像是回波損耗的測試，那你就說對了。回波損耗測試是通過向雙絞線注入DM（差模信號）然后測試返回的DM信號，然而TCL是測試CM信號。

Field test requirements for ANSI/TIA-568-C.2 are deferred to ANSI/TIA-1152. At this time, TCL is not a field test requirement because until the DSX CableAnalyzer came along, no field test equipment vendor could perform a TCL field test. It is anticipated that other test equipment vendors will eventually offer TCL field measurements too. Field testers are normally capable of DM measurements only – the DSX CableAnalyzer is capable of both DM and CM measurements, hence its ability to measure TCL and ELTCTL.

翻譯：對于ANSI/TIA-568-C.2現場測試要求直到ANSI/TIA-1152標準。在那個時候，TCL并不是一個現場測試的要求，因為沒有現場測試設備供應商可以執行TCL現場測試，直到DSX-5000電纜認證分析儀的誕生。預計其他品牌測試設備廠家最終也將提供TCL現場測量。現場測試人員通常僅能DM測量 – 對DSX-5000電纜認證分析儀能夠既DM和CM的測量，因此其有測量TCL與ELTCTL的能力。

If you wish to add TCL and ELTCTL to your standard Category 5e, 6, 6A or Class D, E or EA test, select your test limit under the folder in DSX called Balance Measurements and look for your test limit with a suffix of (+TCL):

翻譯：如果需要對于Cat5e，Cat6，Cat 6A測試TCL和ELTCTL參數，你只需要再DSX-5000 的文件夾下面找到+TCL的后綴就可以了。

This will add ≈ 6.6 seconds to your AUTOTEST time.
TCL測試將增加6.6秒測試時間。
The suffix of (+TCL) indicates a standard ANSI/TIA or ISO/IEC test with the addition of TCL and ELTCTLmeasurements. ANSI/TIA-568-C.2 and ISO/IEC 11801:2010 only provide test limits for Channel measurements at this time. If you select a Perm. Link test limit, the TCL and ELTCTL measurements will be performed, but there will be no PASS/FAIL criteria applied. You will also see the Industrial Ethernet standards TIA 1005 with the different E1, E2 and E3 environmental TCL and ELTCTL limits.

翻譯：有（+TCL）后綴的預示著ANSI/TIA或者ISO/IEC測試有這個規格。 目前ANSI/TIA-568-C.2 and ISO/IEC 11801:2010 僅僅提供信道測試的極限值，如果選擇永久鏈路測試，TCL和ELTCTL也會被執行，但是不會有通過/失敗的標準。同樣你也會看到工業以太網標準TIA 1005 ，E1,E2,E3的標準的限制。
 
In the example below from a DSX-5000 CableAnalyzer, a Category 6A Channel was tested. With a margin of 5.4 dB (6 dB is a factor of 2), you can feel confident that this link will perform well, even in a noisy environment.
翻譯：從下面DSX-5000的例子中可以看到，Cat 6A通道測試有5.4db的余量，你就不用擔心了，因為這條鏈路表現非常好。即使在有噪音的環境下。