Your ISP can do a live stream of a TV program to your exchange, and all that ISP's customers on that exchange can watch that program live. Before multicast your ISP had to do a stream for each customer. The stuff in the exchange "multicasts" it out to them.
AIUI, FTTC multicast does it at the exchange then cabinet levels.
My broadband basic info/help site - www.robertos.me.uk
| Domains,website and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync ~ 59.4/14.4Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant."
- Jean-Antoine Petit-Senn.
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.