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the cable person put a new line in because the outlet where you planned on hooking it up would have given you no signal or too weak a signal to be worth it. this happens a lot in older houses, and depends on how the house was wired. the more times the signal went through a splitter of any kind, the signal is degraded. had the guy hooked it up to the whole house, you'd get it everywhere, but for you only your one cable will work. all of it is carried on different frequencies, so they can all coexist.
and they put a splitter (which isn't actually a "splitter", it separates the frequency range so you get ONLY the cable internet frequencies on one feed and ONLY the regular cable frequencies on the other) before the cable modem to filter out the noise from the regular cable, not to keep the computer cable from interfering with the regular cable. that's why they only place in on front of the cable modem, not in front of every TV in your house.
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