Is this modem Docsis 3.0 or compatible with Comcast?
822667
No, this is a DSL modem. A docsis 3.0 would be a cable modem. I suggest you search DocSis 3.0 cable modem.
1350994
yes the 3.0 docsis is for faster internet. that is why providers recommend 3.0 and not 2.0 (:
2043359
Hi Scott, for this case, if you only need a modem, we'd recommend the CMD31T: NETGEAR DOCSIS 3.0 - High Speed Cable Modem (CMD31T)
1134966
Does NOT work with my Comcast! Not sure if it's incompatible or just broken.+
1166770
Any DOCSIS 3 modem should work. I have Motorola Surfboard Extreme and it works great.
272436
I do not know if it is compatible with Comcast. It is a modem-router in one unit. I do want to add that it quit working after about 2 months and we ended up purchasing the recommended device from AT&T.;
808909
This modem indeed supports telephony. I unpacked my Amazon package, plugged in my home phone to the back, plugged in the coaxial cable, called Comcast to provision the new modem and was up and running in under 20 minutes. Here is a list of Comcast DOCSIS compatible modems: http://mydeviceinfo.comcast.net/ I purchased this one used at a significant discount and it's operating perfectly. Good luck!
272438
I don't know if it is compatible with Comcast but yes it is both a router and a modem.
2241459
Yes it is but you have to make sure once you get it you call comcast and register it or it will not work properly. That is with any personal modem though.
749583
I am using this modem since last August. It is working very well with comcast (xfinity) internet service.
1280908
No, this modem is compatible with the Comcast system, you should not have to call them to set-up modem.
2144759
I'm not sure of that. My service is 15 mbps and it does just fine. My service provider is Time Warner and the RCA DCM425 was the modem they supplied, but you might contact your service provider and ask, or go to their website and check. Provider's websites will usually show which devices work with their system. That modem is a DOCSIS 2 and 50mbps may very well require a DOCSIS 3 modem.
383288
Hello Cheryl S. Yes, the R20000G is compatible with modems that are provided from Xfinity/Comcast.
1667766
this is NOT a cable compatible modem. This modem is for DSL connection use only. You need to continue to search for a Cable Compatible modem... it should have a spot in the back for you to screw in your com cast cable line. Possibly refer to Comcast customer support for an updated list of compatible modems. I'd hate to spend the money and it doesn't do what you need.
972556
That I don't know. The reason I went with this one is because this is the exact modem that Comcast uses and I wanted to minimize any transfer problems. the modem I had before this was Aria which Comcast also uses. If you go with one of the other modems, just make sure it is supported by Comcast before purchasing because not all modems are and I didn't feel like doing the research. (also just bec an item is more expensive doesn't mean it's better. however keep in mind that this is a modem only and NOT a modem and router in one). -Take Care.
622402
Yes it is. I have Comcast. Comcast has a list of compatible modems on its site.
987189
No. I have my own DOCSIS 3 compliant modem with no ill effects. It has been checked out and verified by the cable provider. And it does work. Just hit with lightning (again) 3 weeks ago. Took out cable company outside equipment but inside is just fine.