Circet EIR

Sounds like you're probably in an Urban location is you're a Virgin Media customer. Eir are rolling out a fibre network in Urban areas for the last few years, and this is probably related. It will give you (and others in the area), the option to get a Fibre connection instead of Virgin Media cable in time. Others use the OpenEir fibre network to deliver their services, so you won't be limited to Eir for fibre.