Is this modem Comcast compatible?
1394981
Generally, yes. It supports up to 38Mbps speeds. You should contact your ISP to verify.
1394982
I've had this modem for a long time and I have Comcast/Xfinity. However, I just looked at the approved device list on the Comcast website (http://mydeviceinfo.comcast.net/) and the SB5120 is no longer listed.
980756
It worked for my Comcast service, but I have no idea about Time Warner compatibility.
236694
At the time that I purchased this modem I was a subscriber to a similar bundle through Mediacom,with whose system it was compatible, but I was told by Comcast (upon subscribing to their "Triple Play") that it was not compatible with theirs. I subsequently purchased a Arris TM602G, which is compatible with Comcast's system, and am currently experiencing trouble-free service. Both of these units were purchased through Amazon, either "used' or "reconditioned" (at considerable savings). I sincerely hope that you find this response satisfactory.
2258888
This works fine with Comcast. You may need modem. Not all modems are compatible with Comcast.
1383112
I have never notice that. I called Comcast to see if that is similar to other modem's and they told me yes.
2194775
Yes. Need to check if it compatible with you service provider. Be aware that many providers will not service modem yout did not buy from them.
2241462
I've had no issues with it. The tech when he installed my service tried to upsell me a newer modem saying this one was too slow. I constantly get 8 Mbps down and 5 up. And yes I have Comcast.
1982276
Yes. That is exactly what I use it for. It was easy to set up. Just call Comcast as soon as you get it. Works great.
1101729
I can't speak to any but the Scientific Atlanta that I have. As to being "guaranteed" to work on Comcast, I can't say, but the modem it replaced was a Scientific Atlanta of the same type and this modem replaced it and works perfectly. I had no problem with Comcast in switching from one of theirs to one of my own.
1890965
No this modem does not support comcast phone service. There is a modem arris on amazon that does.
1980850
Will not support Comcast, has 5 portals. I am very pleased with this modem... rd
383288
Hello Cheryl S. Yes, the R20000G is compatible with modems that are provided from Xfinity/Comcast.
841033
I do not believe so this is for dsl service. You need a cable modem for Comcast. If you search cable modem several should show up.
1280908
No, this modem is compatible with the Comcast system, you should not have to call them to set-up modem.
1156085
It works with any ISP whose modem has an RJ45 LAN port. Most new modems have built in routers however, so you have to contact Comcast about either bridging the router to the Ubiquiti or disable the router features of the Ubiquiti and use it as a wireless access point.
481323
NO.. Actually I sent this modem back. I did replace it, however, with a "TELEPHONY" modem that is just like the one I was renting from Comcast. I didn't realize my error in reviewing this item until after I hit ENTER. sorry
272439
It is a combination modem+router. I use it with my phone line. I don't know what Comcast is so I don't know if it works with it.