This is just an FYI...
I have Time-Warner All-In-One for my phone, cable and Roadrunner services. One of the features available is Caller-ID on TV so you can see who is calling while watching TV.
A while back there was a discussion about cable amplifiers, splitters and cable modems. Someone mentioned something about needing 2-way splitters if you have a cable modem.
While I've never had any problems using off-the-shelf splitters, I just found out that installing an amplifier between the cable modem and the digital cable box blocks the Caller-ID feature as well as some of the On-Demand channels, such as Movies On Demand.
It looks like I'll have to move my amp beyond the first splitter so the modem cable box can talk to each again.