What type of internet connection is this? DSL/LAN T1 , T3??

Whenever asked that question I don't know exactly how to answer. I have an ISP called "Current Broadband" It is a company that works with the local energy Co. here in Cincinnati. I have a modem, I guess you'd call it , that is a small black box not unlike a standard AC adapter with a couple lcd lights on it. It plugs straight into any power outlet in the house and provides an online connection via the power lines. I've been asked if I have dial up , cable , DSL , or T1 or T3 or higher. I don't know what some of these are but have always answered DSL????? What is the correct answer?. I appreciate you taking the time to give me a hand. By jjck2727