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FIGURE 154 The NEXT measurement If too much signal is coupled from the transmit pair to the receive pair of a connection, the receiver will not be able to distinguish the far-end signal from its own transmission
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NEXT must be measured in both directions on the cable link, to prevent the situation where one end of a cable passes NEXT and the other end fails Singleended measurements are often made in the telecommunications room, as it eliminates carrying the tester around to each workstation outlet Excessive untwist at the connector is more often found at the workstation end, however, because the outlets naturally separate the conductors, and because the individual jack plates are more difficult to inspect Also, the workmanship may be less because the supervisory control may not be as great as would exist in the telecommunications room So, if you only measure at one end, you are likely to miss more of the high NEXT connections The equipment at both ends requires appropriately low NEXT to operate properly A related figure of merit for a cable link is ACR Although not yet specified by the standards, ACR is a very good measure of how the attenuation and the NEXT can influence the performance of networking interface devices Attenuation may be used to calculate the received signal strength of a signal transmitted from the far end NEXT can yield the level of the interfering crosstalk signal from the near-end transmitter The near-end receiver is thus required to cope with a signal-to-noise ratio that is basically the ratio of the two signals: the attenuated far-end transmission and the near-end crosstalk Since both attenuation and NEXT are directly measured as part of the testing, it is very simple to ratio the two to produce the ACR figure The higher the ACR number, the better the expected performance Since a ratio of two logarithmic quantities is their numerical difference, the ratio is simply: ACR attenuation (in dB) NEXT loss (in dB) One of the things that concerns network hardware designers is that the ACR decreases steadily with frequency This means that at 100 MHz, the ACR margin may be very small indeed Thus, it may be of benefit to those planning to eventually go beyond 100 MHz to purchase cable with the highest ACR possible Reporting Pass and Fail Criteria An important part of TSB-67 is the carefully detailed requirements for the reporting of test results In general, the standard requires that each measured result be reported in units appropriate for the test and that a Pass or Fail determination be reported Measurements, such as for attenuation or NEXT, that might be very close to the limits are reported with an asterisk in addition to the Pass or Fail A data report is simply the visual indication of the field test set In all of the modern cable scanners, the visual display is a liquid crystal display (LCD) that also allows the display of some graphics Of course, it is important for a permanent record of the report to be made, so the testers also allow the test data for each cable to be stored and later printed out Figure 155 shows a typical cable scanning report
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FIGURE 155 A typical cable scanning report (Courtesy of Datacom Technologies, Inc)
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The wire map tests are reported simply as Pass or Fail The length measurement is performed on all pairs of the cable under test, but the pair with the shortest electrical delay is used for the Pass/Fail determination, and its electrical length (in feet or meters) is reported An additional 10% in length is permitted to allow for uncertainty in the NVP of the cable The tester must make a determination of attenuation Pass/Fail based on a calculation of the allowable attenuation at each frequency of measurement If the cable fails, the attenuation at the frequency (or highest frequency) of failure is reported Measurement steps are to be no greater than 1 MHz intervals up to 100 MHz for Category 5e, or the maximum frequency for lower categories of cable Attenuation values of less than 3 dB are reported, but are not used in a Pass/Fail determination An optional determination of the attenuation per unit of length is calculated for
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