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CAT-3 Short for category-3. One of two sets of standards, the other being CAT-5 (category-5), that together govern the details of the twisted-pair cabling, and the cabling installation, for cables intended to carry data at multimegabit rates over distances of the order of a hundred metres. As a guide, CAT-3 cabling supports up to 10 Mbps, CAT-5 cabling supports up to 100 Mbps.