Motorola MB7621 Cable Modem | Pairs with Any WiFi Router | Approved by Comcast Xfinity, Cox, and Spectrum | for Cable Plans Up to 900 Mbps | DOCSIS 3.0

Slower connection to Xfinity than shown (15 minutes), but if you're patient this will self-register. I took a different route and attempted to add the MAC address into my list of authorized Xfinity devices through their app, but requires continuious network connectivity, So once you've disconnected your old cable modem (unless you have a splitter), your internet goes down.My experience was just over 30 minutes, but it works perfect. The 4-5 page fold out instructions show different variations of blinking, pulsing, or steady light to indicate status. The modem will restart several times as it binds to your provider, downloads updates, and reboots, but the lights are a very mellow version of status. When it is all the way online and functional, it will be a solid wite light. The light is neither distracting nor obnioxious.I run a TPLink Archer BE800 Wifi 7 Router, and that also took a few minutes to integrate, but the delay was on me having forgotten that one of the 2 10G ports is primary. Once I remembered that I was up instantly.I greatly appreciate the small and blend into the background nature of the modem. So many of the cable modems are a loud color, tall, or Christmas Tree of bright indicator lights.This modem focuses specifically on a connection to your cable provider, and does not address wifi, or providing additional ports. It is perfect for my needs since I have the new TPLink Archer. This for me was a choice with specific intent, as I like function separation, that way if one fails the cost to get back on line is far less expensive. But from the selections currently available I did not see a combo Modem/Router that was DOCSIS 3.1 along with Wifi 7 and 10 G ports.

Decided to stop paying for xfinity xb7 rental. Replaced with this and a Gl.i router. Setup and activation to xfinity went smoothly. Wifi performance of this modem with new wifi router is a bit better than the xfinity xb7. Temporarily wiring a laptop thru ethernet I got much higher speeds than I got thru the XB7. Bonus was when I returned the xb7 to the xfinity store they were able to apply a 1 year promotional plan to further reduce the monthly cost. @ about $50 less a month now, the cost of this modem and the Gl.i router will be paid off in less than 6 months.

So unless you are granted the best Spectrum modem you are going to have issues with packet loss and will strangely need to replace the modem in 9 months to a year. Save yourself the aggravation and just get one of these. I had the 3.0 model for 7 years without an issue and now that Spectrum is going 3.1 I first got a free Spectrum modem proceeded by 2 swaps in a 2 month period. The issue was packet loss from time to time that would cause issues when I worked and gamed from home. So I was tired of free and purchased the Motorola 3.1 and not really shocked. My network has been stable ever since. Save yourself the troubles and just buy one of these already and be stress free. All you have to do is login to Spectrum's website. Get technical support, tell them the make, model and MAC of the unit and they will add the new MAC and delete the old MAC, give it about 15 minutes and you will be back online. Will take you 20 minutes from the 5 minute conversation with Spectrum to the Modem setting itself up. It's really that easy.

This is a solid modem, and aside from the fact that there is no phone jack for VOIP, it's served its purpose. I would have given 5 stars if it had a phone jack. We got an alert over our TV that there was a shelter-in-place alert for our neighborhood that we missed because we just realized the phone has been disconnected since we got the new modem.

I’ve been using the Motorola MB7621 for my Xfinity broadband for over 2 years now, and it’s been working perfectly. Buying your own modem like this one can save you money compared to renting from the provider. Just be aware of its specs — it supports standard bandwidth speeds but not the ultra-high-speed tiers. Since Xfinity’s biggest limitation is usually low upload speeds, spending extra on a high-speed modem isn’t really necessary. Overall, a solid and cost-effective choice for typical Xfinity internet users.