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TABLE 126
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Comparison of Category 5, Category 5e, Category 6, and Category 7 Channel Performance Limits Category 5 Class D 1 100 100 Category 5e Class D 1 100 100 Category 6 Class E 1 250 200 Category 7 Class F 1 750 600
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Parameter Frequency range, MHz Positive ACR frequency, min, MHz Attenuation, dB Return loss, dB NEXT, dB PSNEXT, dB ACR, dB ELFEXT, dB Propagation delay, ns Delay skew, ns
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240 80 271 271 31 170 548 50
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217 120 399 591 182 232 548 50
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208 141 621 413 f/s 504 20
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Specified at 100 MHz for installed link Requirement for Cat 5 added by TSB-95 to certify installed cable for gigabit operation
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Backward Compatibility of Categories 5e, 6, and 7 The new performance categories present a more serious problem You will recall that the major performance hit in a Category 5 link turns out to be the crosstalk, due to the connectors The 8P8C, RJ-45 style, terminations have a relatively poor score for NEXT and FEXT, which always show up as the major contributors to return loss and impedance mismatches The Category 6 designs adjust the conductor geometry within the RJ form factor to bring these degrading performance parameters an absolute minimum This allows a positive ACR out to 200 MHz, rather than the 100 MHz range of Cat 5 This performance holds true as long as you are using all Category 6 hardware, which is designed to compensate for reactance differences between the plug and jack Unfortunately, preliminary testing revealed that Cat 6 hardware does not always give sterling performance when mated with legacy Cat 5 components In some cases, the link performance may be degraded below even Category 5 Needless to say, this is a shocking result We have depended on being able to use a compatible jack, plug, or patch cord of a higher category with no penalty However, Category 5/5e and Category 6 may not necessarily mix, although the connections may give mechanical compatibility and have DC electrical continuity
Gigabit and 10 Gigabit Cabling Technology
This problem appears to lie only with the backward compatibility of Category 6 connecting hardware So, any cable that meets Cat 6 standards should work fine in a Cat 5/5e application There is total compatibility between Cat 5e and Cat 5 components, although performance may not stretch to the enhanced level Category 7 presents an entirely different problem, as both cable and connecting hardware are quite different from the lower categories Cat 7 cable consists of up to four pairs of individually shielded 23-gauge wire, with an overall shield Category 7 connectors have been generally defined with two options: one a unique dual-purpose RJ-style modular connector, and the other a non-RJ connector that keeps each pair totally separate and separately shielded Note that modified RJ-style connector designs may present another backward-compatibility issue, as we had with Cat 6 If the non-RJ connector is used, any reverse compatibility will be provided through the use of adapter cables that can translate the connector types, much like those the fiber systems have been using to adapt the SC to older ST and SMA connectors For more information on advanced performance categories, refer to s 3, 5, and 16 Testing Legacy Category 5 Installations The specifications for Category 5 were developed before all the engineering for gigabit speeds was done At that time, transmission was primarily unidirectional on each of the two pairs of the cable, and life was good The main parameters that caused link failure were attenuation and crosstalk (NEXT), and the other cable parameters were usually all right, if those two requirements were met The unexpected use of all four pairs for gigabit, in a split-signal, 3:1 reversible manner, brought out the problem of the differing velocities of propagation between the pairs A common cable manufacturing practice is to vary the pitch of the twisting to minimize crosstalk between pairs This results in each pair having a slightly different twist-per-inch, therefore decreasing the unwanted coupling between pairs (the source of crosstalk) However, this practice also causes the pairs to vary in their respective velocities of propagation how long it takes for a signal to traverse a length of cable If we split the gigabit signal among four pairs, as Gigabit Ethernet does, the four signals will arrive at the remote end at slightly different times This phenomenon is called delay skew There may be no way for the remote receiver to reassemble the signal, as the bit times may virtually overlap The only way that this parameter can be controlled is to specify it and use cable and components that meet this tighter delay skew spec See Table 127
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