Setting up the Motorola MB7621 Cable Modem is pretty straightforward and seems to work well for most people who try it. It's compatible with popular internet providers like Comcast Xfinity, Cox, and Spectrum, which is handy if you're looking to dodge those annoying monthly rental fees for ISP-provided modems.

The manufacturer describes the MB7621 as supporting cable plans up to 900 Mbps with its DOCSIS 3.0 tech. Based on our research, many folks find it reliable, stable, and easy enough to get up and running. You basically just plug it in, let it do its thing, and maybe get a little help from your internet service provider. Within a few minutes, you should be online.

People also mention that they don't need to reboot this modem often, which is great compared to some that can be a bit temperamental. Just a heads up, though—it doesn't come with a wireless router. So, if you want WiFi, you'll need to have a separate router ready to go.

It's also got a compact design, which is nice for saving space and helping it stay cool, potentially making it last longer. Plus, it skips the Puma chipset, sidestepping some of the latency issues that can pop up with other models.

Just remember, it's best used for what it's designed to handle. It's not set up for the fastest DOCSIS 3.1 speeds that you might need for gigabit internet down the road.

But if you're not chasing those ultra-high speeds yet, the Motorola MB7621 can be a solid, budget-friendly pick.

Yep, the Motorola MB7621 Cable Modem works with Comcast Xfinity. It's also good to go with other providers like Cox and Spectrum.

The manufacturer mentions it's built for cable internet plans up to 900 Mbps. It runs on the DOCSIS 3.0 standard and has a 1 Gbps Ethernet port, so it's a solid pick when you pair it with a decent WiFi router.

Based on what we've found, a lot of folks have managed to get the MB7621 up and running with Comcast Xfinity without much hassle. Just a heads up—you'll likely need to contact your internet provider, like Comcast Xfinity, to give them the modem's MAC address for activation. It's a key step to get your connection started.

Once it's all set up, the MB7621 can handle multiple smart devices like TVs, laptops, and smartphones pretty well. But remember, to really use the modem's potential, your internet plan should match up with its capabilities.

While it can handle speeds up to 900 Mbps, it tends to shine best with plans up to 650 Mbps, according to our data. Keep this in mind if you notice any speed or connectivity issues.

If you ever run into performance problems with Comcast Xfinity, it might help to double-check your setup or get in touch with Comcast support. Based on our research, some people have pointed out that the modem doesn't always hit top speeds on Xfinity, especially with uploads.

This could be due to local network differences or other service-related factors. Overall, the Motorola MB7621 is a well-respected choice if you're after a cost-effective and capable modem for Comcast Xfinity.

The Motorola MB7621 cable modem can handle internet speeds of up to 650 Mbps, according to the manufacturer's description. This should be more than enough for many broadband plans, so you can get the most out of your internet service.

If you're setting it up with Comcast Xfinity, there are a couple of steps you'll need to follow. First, you'll have to contact Xfinity to activate your modem on their network. You'll need to provide the modem's MAC address, which is on a sticker on the device. Don't skip this step—otherwise, you might run into connectivity issues.

After you've registered the modem's MAC address, setting up is usually pretty easy. Although it's generally plug-and-play, it might be helpful to have Xfinity's support contact just in case you need any guidance. Sometimes, if your speeds are lagging, it might be due to a configuration issue with your ISP that Xfinity can help sort out.

Keep in mind, the MB7621 doesn't have a built-in wireless router, so you'll need to connect it to a separate WiFi router to get your devices online. Make sure your router's properly configured and maybe give it a reboot after setting up the modem; that often helps with connectivity hiccups.

While the MB7621 generally gets good marks for reliability, some folks have mentioned occasional signal drops or inconsistent speeds. These issues can often be linked to cable line conditions or needing a firmware update, something Xfinity can check out if you're experiencing trouble.

So, if your internet plan falls within its capabilities and it's set up properly, the MB7621 should work out well. Just keep an eye on the firmware updates and touch base with Xfinity if you hit any snags.