If alien crosstalk is an issue in any cabling, it would come up in 802.3af before you ever saw it in 802.3ab. 48 volts will cause alot more noise than 5 volts (Is that the voltage for standard 802.3?). I've seen bundles of 20+ cat 5 ethernet running 802.3af without seeing problems. My guess would be that alien crosstalk will not be an issue with Cat 5 no matter how many cables are bundled. Of course, this assumes the are carrying pseudo-random data (as would be seen in a production network). If all the cables (or a large portion of them) were running the exact same data, a cumlutive effect might be seen. Like soldier marching in lock-step.
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