<snip> I have run several robbed-bit(non-PRI) T1s on standard CAT5e ethernet cable for runs of over 100 feet(30 meters) and have seen no increase in the error rate of the T1s. I've done this for years, and even the telco install techs say it really doesn't matter especially if you are running robbed-bit, supposedly its more forgiving than PRIs are.
A good Cat5/Cat5e cable will perform just fine at the signalling and drive levels of a T1 -- 3V signalling at like...hmm can't remember MHZ but if anyone's in that interested I'll look it up.
The problem happens in that a lot of people mis-wire them, or wire an ethernet crossover that doesn't' work right for a T1. T1 uses pin/pair 1-2 and 4-5, ethernet uses different pairs. Then they make the crossover ethernet style and mess it up, or invert some of the T1 signaling pairs so there's a mis-match. Or run the cable close to noise sources (fluorescent light ballasts are my personal bane)
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