Cat6/6a jack to plug pre-terminated trunk cables offered by FS.COM have passed fluke test. These network cables deliver fast and easy installation, but with fairly-low cost. Which greatly enhance work efficiency while reduce the labor cost in high-density cross-connection and patching system. Then Why Ethernet cables should better pass fluke test? How this test is generated and what the meaning of the value and graphs shown on it? Let’s get through the specifications just a bit, so you may find the answer.
So what exactly is fluke test? The name tells it all. It is supported by Fluke Corporation—the most commonly known manufacturer of cable testing equipment. Their equipment combines numerous tests in one tester and is adaptable to the ever changing technology. Fluke test checks for cable performance. When testing a specific cable, the chief reason it is used for is to check to what length the cable meets performance standards per particular cable type (cat5e, cat6, etc.). It also checks resistance (ohms), insertion loss margin (dB), frequency (MHz), prop. Delay (ns), delay skew (ns) and limit (dB). While checking each of the pairs, the fluke test looks for the amount of noise (interruptions) present during data transfer, indicating if this noise is within industry standards.
Network cables now are ubiquitous everywhere and serve as an integral part of any modern AV system. A failed cable would lead to disastrous consequence to a network. While network cable testing and certification are not mandatory in all cases, cable testing still plays an important role in verifying cable quality and assuring a new network is working properly, as well as helping in existing cable network troubleshooting and problem solving. Use a fluke test, therefore, is essential to determine the performance of a cable or network to avoid current and future network issues, which provides a level of assurance that the installed cabling links provide the desired transmission capability to support the data communication.
The fluke tester supports two sets of specifications for Cat 5e and 6 patch cords: the TIA and the ISO specs. The ISO spec is somewhat stricter than the TIA. In the case of Cat6a patch cords, the tester supports only the ISO specs. Here is a sample test report of FS.COM Cat6 jack to plug pre-terminated trunk cables. We’ve numbered some of the most significant items for explanation. You can download full test report here.
This is the length, in meters, for which the specification limits used in the test were calculated. It should always equal or exceed the actual length of your cable, and represents the next-longer length of cable for which the fluke tester has a programmed set of limits.
This table shows the tester’s estimate of the length of the cable (which may not be the same as the actual length–this figure is estimated by measuring electrical delay), the propagation delay (i.e., how long it takes a signal to get from one end of the cable to the other) in nanoseconds, the delay skew in nanoseconds, and the resistance of a pair in ohms.
This table identifies the worst near-end crosstalk (NEXT) result in the cable. Crosstalk is the tendency of signals on one of the data pairs to induce a signal on another data pair. Crosstalk is tested between each possible pair/pair combination in the cable, and is tested both from the “main” and “remote” tester units, with the results of each reported separately under the columns “MAIN” and “SR”. The “Worst Case Value” table, to the right, is always blank on patch cord tests.
“Worst Pair“—This line shows, with reference to the connector pin assignments, which set of pairs exhibited the worst crosstalk.
“NEXT(dB)“—This line does not show the actual NEXT (Near-End Crosstalk) value; rather, it shows the smallest margin, in dB, by which the measured NEXT value beat the testing limit. Note that NEXT is expressed as a positive value, and that the higher this value is, the lower the level of crosstalk is.
“Freq. (MHz)“—This line shows the frequency in Megahertz at which the worst NEXT margin, shown on the line above, occurs.
“Limit (dB)“—This line shows the limit, in dB, for NEXT at the frequency shown. Adding this value to the margin shown on the NEXT(dB) line tells you the actual value in dB of NEXT at that frequency in the cable tested.
This table identifies the worst pair in the cable for return loss performance, and shows that pair’s worst passing margin against the specification’s return loss limits. Return loss is the loss caused by signals in the cable reflecting as a result of changes in the impedance of the line.
As in the table to the left, is an estimate of the length of the cable based upon the time it took signals to travel through it. These estimates are generally fairly close but can differ from the measured physical cable length.
These graphs show the NEXT and return loss values, in dB, as they vary by frequency. The horizontal axis is frequency (it will run to 250 MHz for Cat 6, and 500 MHz for Cat 6a), and the vertical axis is dB. In each case the relatively smooth, lower red trace shows the testing limits, and the more uneven, bumpy colored traces above show the six pair combinations (for NEXT) or four pairs (for RL), each in a different color. So long as the traces for the pairs and pair combinations stay above the applicable limit line, the cable passes the specification.
Most business today rely greatly on the local area network (LAN) for data transmission and communication. Network issues cause by inferior cables consistently pose a threat to business operation, so that quality cables matter to the health and reliability of the whole network. Cat6/6a pre-terminated trunk cables supported by fluke test are available in FS.COM in ready stock. For more information, please contact us via firstname.lastname@example.org.
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