【 Cable testing 101 q series 】 — — What is a TCL and ELTCTL?

by:FOT     2020-07-16
【 Cable testing 101 q series 】 — — What is a TCL and ELTCTL? Maybe you have TCL in the single cable specification and ELTCTL, or you have been in the DSX CableAnalyzer notice they are there, you are is not familiar with these parameters, don't know what they say, also don't know whether you need. Next, let us have a deeper understanding. What is the mode conversion? In our previous cable test 101 q series: understand copper balance method, we introduced the common mode ( Unbalanced pattern) And differential mode ( Balance mode) The difference between. Again reiterate that Ethernet in differential mode being pumped into the signals to a pair of conductor, the conductor instead of the positive and negative voltage on each other for reference. By common-mode noise signal injection, by contrast, to a pair of conductors, they spread at the same time, and as a reference. When noise injection to cable, part of the common mode signal can be converted into difference model, become a part of the Ethernet signals. This phenomenon is called the mode conversion, which is unfavorable for Ethernet transmission, because it will lead to differential mode signal no longer balance of the Ethernet, which pose a potential error and retransmission. How to measure? Measurement model transformation can be used two transformation parameters - — TCL and TCTL. Horizontal transmission loss ( TCL) , in the same measuring line at one end of internal model transformation. Through to the line to inject differential mode signal, and in the same line for measuring return on common mode signal. Returns the less common mode signal, balance the better. Lateral transfer loss ( TCTL) Refers to the opposite end of the measurement line internal model transformation. Different from common mode signal measuring return, TCTL to line to inject the differential mode signal, and measuring link at the other end of the common mode signal to realize measurement. Similarly, the common mode signal is smaller, the better balance. In TCTL test, due to insertion loss, so the number of common mode signal is related to the length of the link, so balanced processing must be considered. Namely ELTCTL, such as level of lateral transfer loss transformation. Parametric representation? Because by common-mode noise is injected to the cable, so it's a very good immunity to TCL and ELTCTL indicators, said cable link under noise environment can provide adequate performance - — The noise sources include 10 gbase - at a high speed T from adjacent cables in the application of external crosstalk, or from other external interference sources of noise in the industrial environment. Whether you need to TCL and ELTCTL? The short answer this question: is that also is not. Updated manufacturers test TCL and ELTCTL industry standard requirements, to ensure consistency. This is why you see these parameters in the specification sheet. Standards, however, do not ask for TCL and ELTCTL on-site testing, in which it is possible that lack of understanding of these parameters and the field test. Wrong but, TCL and ELTCTL on-site testing means have to believe that the manufacturer's statement. The good news is that the DSX CableAnalyzer has the unique ability to measure differential mode and common mode signal, therefore can be tested for TCL and ELTCTL, at the same time also can all of you are familiar with other performance parameters of the standard tests, such as the NEXT, PSNEXT, insertion loss and return loss, etc. For TCL and ELTCTL mode transformation parameters testing, typical increase in testing time for 6 seconds. This not only allows you to manufacturer's statement, and compared with the complex external crosstalk the field test, the method to determine the immunity takes much shorter. If you have any questions or problems, you are welcome to contact us at any time
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