NETGEAR - Nighthawk 32 x 8 DOCSIS 3.1 Voice Cable Modem, Voice support - Black (Renewed)

Was delighted to find renewed unit sold at less than half the retail price (which is high because the CM1150 is the only Xfinity approved "customer owned" modem offering phone VOIP as well.Using Xfinity phone app, I was able to set up and activate this modem quite easily. My phone service worked and I measure internet service at 800mb/s... per my Xfinity plan. I streamed a movie that night.. No sweat. I was about to take my original Xfinity Gateway back to the store when suddenly I noticed internet was struggling. eg. my wife was on zoom chat that was halting. I was using google translate and it was taking a minute to do simple translations. Within 2 hours, all internet was dead. Phone stopped working too.I unplugged the CM1150. Put outside to quickly cool. All to no avail. Re-starting failed to get any functionality back.I then re-activated my Xfinity gateway box. (BTW: That cannot be fully completed using Xfinity App. Phone worked, but internet data was inoperable. That's because special "codes" at their office must be reset before Xfinity will deliver broadband data to that original Gateway modem. Only a live chat session or getting an agent on the phone can get this done). Once up and running, the Xfinity gateway was working normally and reliably.I'm going to hazard a guess. This COULD be an issue of marginal signal strength over the Comcast cable. I am skeptical anything actually broke in the Netgear CM1150. I've had the Xfinity gateway for 2 years and internet loss was only very occasional. My hunch is that the Xfinity equipment may work better as depleted signal levels. I'll probably hold onto the Netgear modem and re-try it in a month- would prefer not to pay the $15/mo rent.UPDATE (2.21.2024)I've been monitoring signal levels in the Xfinity connection status. The signal strength in my family room location is lousy... varying between -15 dBmV and -10 dBmV depending on day, time of day.,etc.I built up a location to place the cable modem very close to my home's Xfinity cable ingress & powered distribution box in my basement, running CAT5 + Phone wire to first floor wall jacks for router & phone base. The Xfinity Gateway experienced 3 - 4X higher downstream signals at the basement location compare to distant family room.Then reinstalled & activated the Netgear CM1150 . Everything came up working within minutes. With just 3 feet 75 ohm coax to the CM1150 from Comcast powered splitter, signal levels between -3 and +1 dBmV are reported by the CM. That's plenty of margin to deal with daily variations that will be in 5 dBmV range. Feeling confident I can dispense with the Xfinity equipment and rely on the Netgear CM.Revising my rating to 5*. Very pleased!

I think customers provide negative reviews with xfinity hook up because they don’t take the time get the modem registered with x-finity. But I found that after going through the xfinity app and adding the modem was an easy task. After that it worked seamlessly with the external router. Speed is great.

For years I was paying comcast to rent a cable modem with wifi, only to disable the wifi and use my own router and access point. Essentially making it glorified cable modem. 16$ a month down the drain.I decided to save some money, buy this top of the line modem refurbished and away I went. It should start paying for itself in a year.Activating cable modem for data was easy. Connect the modem, wait for it to connect, open a browser and be redirected to the xfinity activation page. Login and I was surfing the web in a matter of minutes. Speed are as fast or faster than before. Telephone was a little different...The telephone activation required a call to comcast/xfinity and be transferred to there activation department. This went smoothly and quickly but was an additional step. Maybe a 5-10 minute call.As for the four ports only one will work. Comcast since the dawn off time only gives you one IP address which you then use a router to distribute. This is just the way it is. I do see that there is a connection teaming setting in the modem configuration but till I get a plan over 300Mbps I am not going to worry.As for the star rating for “WiFi Signal”. I gave it one star... This is not a WiFi access point... scratches head...

I bought this modem to for my home when I switched to Comcast Xfinity. NOTE - this is only a modem. It does not include a WiFi router. I bought a new Synology RT2600ac WiFi router to connect to the modem wirelessly.The cable tech installed the NetGear modem and it seemed to work initially. But when I connected a couple of wifi routers to the modem with cables like my previous setup, I wasn't able to get internet access through them. I could connect to the net through the modem directly with an ethernet cable, but the WiFi routers would not connect. I called NetGear Tech Support twice and they weren't much help. They told me that there must be something wrong with my wireless router since I could connect with a cable. Xfinity sent out another technician a couple of days later, but he couldn't figure out the issue either. I then chatted with Xfinity and they forwarded me up the ladder to a fairly high level network specialist. After about an hour, they decided I had some type of "network problem" and set up an appointment for another tech to make a house call.After searching on the internet a couple of times, I finally found that there were others that had experienced this same issue. It turns out that the four jacks on the back of the Netgear modem don't all function the same. Only LAN1 should be used for connecting a router! I assume the other jacks are there for future upgrades to the device (as DOCSIS 3.1 is further developed). However, jacks 2-4 are worthless right now.So I disconnected both routers, rebooted the modem, and then connected just one router to the LAN1 jack on the modem. This worked and I got excellent speed (up to 500 Mbps) through my new Synology WiFi Router (I have the 1 Gbps service from Comcast). I'm going to buy the Synology MR2200 mesh router to expand wifi coverage through the house.