docsis 3.1

Modem has only been used for a total of 3 weeks before i decided to go with an ARRIS since it works better with my Amplifi HD, quick shipment on ALL sales, thank you in advance Motorola MB8611 Docsis 3.1 Cable Modem for SALE on EBAY

i'm still not sure if i understand the concept of docsis 3.1, technically docsis 3.1 is just replacing the box/modems on both sides with the same cooper cable/lines connected right?(adsl+2) and they offer gigabit speeds @ 1/10gigabits? while fiber does that at the same time? is it easy to...