Bear thanks for exhausting explanation. I personally use internet over cable or I should say "Data Over Cable Service Interface Specification" and as you described on one coaxial cable I have analog/digital TV, internet, phone.

So to sum up (pls correct me if I'm wrong) there are two companies on the island:
CoralCable - any instalation fees? deposit?
- 512kbps for 100USD
any faster speeds?

BTL - 500USD deposit, 100USD instalation
- 512kbps for 90USD
- 1Mbps for 150USD
- 2Mbps for 250USD
- 4Mbps for 425USD

Does not look too encouraging