This is a good product and the price isn't bad if you really want both Xfinity and modem cable and a high performance router. This is one of two models that Xfinity recommends for a 400Mbps Internet connection that will work with Xfinity VOIP landline phone service. These are the fastest cable modems that will work with the Xfinity VOIP system. And it was the cheaper option (although in hindsight it might have been worth paying more to get the other choice (Netgear model) just for the color. It's the only white unit on my computer desk and it really stands out (LOL) At least according to one tech support person I spoke to, many people don't actually upgrade to a VOIP compatible modem transfer the internet connection to a faster cable modem without VOIP I haven't tested this but if it's true it means you can get a DOCSIS 3.1 modem/router with Gb/s support instead of this device I don't think I will do that, you could save a lot of money, but you probably can.Obviously, there are many more cable modems to choose from if you don't need them to support Xfinity VOIP, so would I recommend you think about it before you buy. .But if you are purchasing this device with the intention of using it for VOIP with Xfinity, P RENT, PLEASE PLEASE DO NOT CALL XFINITY TECH SUPPORT FOR HELP WITH THE FIRST TIME SETUP OF THIS DEVICE! It comes with a great set of quick start instructions that might prevent you from doing what I did which was spending over an hour frustrating Comcast agents. and the phone support staff try to set everything up in one step. He's just not ready for it. According to the Quick Start Guide, start the setup by connecting a coaxial cable and Ethernet (preferred) or wireless connection from a PC, Mac, laptop, or similar device to your modem. Device with internet access. When you boot up your modem, it automatically configures itself to connect to the Internet and prepares to activate with Comcast. It is important to note that this step will take 5-10 minutes and must be completed BEFORE you can register it for your account. Trying to start registering on the phone led to a lot of frustration, as the constant reboots ordered by Comcast messed up the software the modem was trying to run to set itself up. You can then follow the quick start guide online and use the www.xfinity.com/activate website to register the modem with your account and set up the desired SSID and password. that you were already using before the upgrade. This will automatically configure the 2.4 and 5 GHz bands to work with the same login and for automatic switching. Only then will you want to play around with the VOIP settings, which has to be done over the phone. The quick start guide lists a special number (1-855-652-3446) that appears to put you in touch with a small group of Comcast engineers who know how to bring your VOIP service to this modem. I ignored these instructions and tried to call Comcast to decide on the installation. As a result, we spent a lot of time with various technicians trying to intervene in the process before the modem was ready for the next step. I wasted everyone's time and effort. The modem ended up having to do the installation and repair itself after the technicians managed to set up VOIP and made it impossible for me to connect to the internet. Basically, the modem had to go through the initial setup protocol again AFTER it connected to my account and VOIP service. And when I finally got back online, the modem itself opened up the Arris webpage where I was prompted to complete the Wi-Fi setup by assigning my own SSID and password, which I MUST do during the registration process if I have followed the instructions. The final analysis is impressive: no matter how hard you try to interfere with the installation process, Arris has it set up so that you'll be successful with your own software. However, my advice is to trust the quick start guide and follow the instructions in it. Start by automatically configuring your modem with your connected device, then complete the Xfinity online activation and then call the dedicated number to set up VOIP. Or, of course, if you already have an Xfinity VOIP modem, you can let it handle VOIP and use that for Ethernet and WiFi connections. I haven't tested this, but heard that from tech support. Overall, this is a very reliable piece of hardware, and it's good to know that it will complete the install even if you go to great lengths to screw it up. Now that everything is properly connected, I get all the advertised features. The only reason I hesitated to give this product 5 stars is because
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