It's been tried in Iowa (Butler-Bremmer Communications) and elsewhere, but last I heard, there were bugs in the multicast implementation of the CMs and the middleware vendor didn't have a very large marketshare. GoBackTV was more focused on the LATAM market and the company is now owned by Aurora. They used Asian STBs, not the Motorola/Scientific Atlanta/Amino/Entone STBs that you may be familiar with. So the end-product looks somewhat cobbled together. It looks like Cisco is doing something in the IP Video over DOCSIS area, and so if you're serious about this, you could reach out to them. Regards, Frank -----Original Message----- From: Phil Karn [mailto:karn@philkarn.net] Sent: Friday, November 29, 2013 11:10 AM To: nanog@nanog.org Subject: Re: DOCSIS 3.0 and Multicast Do any cable companies actually use the hardware multicast capability in DOCSIS cable modems? I can think of some potentially neat uses, but it seems highly unlikely that the cable companies would enable their use to compete against their own TV programming services.