DOCSIS version Production date Maximum downstream capacity Maximum upstream capacity Features           3.0 2006 1.2 Gbit/s 200 Mbit/s Significantly increased downstream/upstream data rates, introduced support for IPv6, introduced channel bonding 3.1 2013 10 Gbit/s 1–2 Gbit/s Significantly increased downstream/upstream data rates, restructured channel specifications 3.1 Full Duplex 2017 10 Gbit/s 10 Gbit/s Introduces support for fully symmetrical speeds The purpose of this post is to merely point out how many years since D3.1 was initially released. It does seem that by this  time there would be tons of D3.1 telephone enabled non-gateway modems on the retail market. daffynitions:  1 Mbit/s = 1 million bits per second    1 Gbit/s = 1 billion bits per second               ... View more

DOCSIS version Production date Maximum downstream capacity Maximum upstream capacity Features           3.0 2006 1.2 Gbit/s 200 Mbit/s Significantly increased downstream/upstream data rates, introduced support for IPv6, introduced channel bonding 3.1 2013 10 Gbit/s 1–2 Gbit/s Significantly increased downstream/upstream data rates, restructured channel specifications 3.1 Full Duplex 2017 10 Gbit/s 10 Gbit/s Introduces support for fully symmetrical speeds   1 Mibt/s = one million bits per second                                                                                                                                               1 Gbit/s = one billion bits per second                                                                    ... View more

I guess you could always try (review) the Netgear CM500V on Amazon. It has Comcast's blessing and does not have a router. unfortunately, it is out of stock a this time.  Normal retail ~ $130   By scrolling over the image (on Amazon) you can see the back-side inputs: 1 port for co-axial cable power   1 either port 2 telephone line ports reset button    ... View more