#1:NETGEAR Nighthawk Cable Modem CM1200 - Compatible with All Cable Providers| For Cable Plans Up to 2 Gigabits | 4 x 1G Ethernet Ports | DOCSIS 3.1, Black (Renewed)
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Customer reviews
Refurbished by Amazon had attractive price
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!
Refurbished No issues after 2 years
Bought this refurbished in October 2022. I've have it running off a small UPS to smooth out power spikes and drops (reduce "wear and tear"). Spectrum increased my plan from 300Mbs to 400Mbs and the CM1200 continues flawlessly. The 4 ethernet ports are overkill unless you are utilizing port aggregation or paying for more than one IP address - this is a modem not a router. Other reviewers are reporting problems, so I'm fortunate to have had zero issues.
Plug in and Press RESET FIRST.
Finally was able to get this working after a few hours on the phone with 3 way calls between comcast xfinity cs and Netgear cs. Each one blaming the other and both unable to figure out why it wasnt working... After hours on the phone i told the CS reps hold TF up let me do a hard reset on the router and viola! Instantly worked! Love having to educate people about their jobs on my day off ??but whatever. At least this one wasn't black listed... The first one I bout from a different seller was blacklisted by comcast of course... Typical slimeball move by the reseller "BuyfromUs2012" make sure you do not buy from them.
Good modem, call for voice/telephone activation
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...
Xfinity - slowness after a few months
I am writing this review to help anyone that has experienced slowness on Xfinity after a few months.
I previously had a modem that was giving me issues. I was paying for 800 megs, but wasn't only getting 5-40 depending on the day. I tried different methods of troubleshooting, and determined it was from the modem. I then purchased this modem renewed which worked flawlessly for a few months. It was also time for an upgrade, so I figured why not.
After a few months, I started experiencing the same issues as my last modem... Slow speeds with nothing really helping. The speeds would be normal right after a reboot, but then dip low after a few minutes. I noticed this time that it happened after an outage, and thinking back that's when my previous one started becoming slow. I thought what the heck this must be an Xfinity issue, so I called Xfinity to remove this CM1200 from my account. I then re-added and... BAM. Everything back to normal. It has been working fine since. I'm hoping this helps someone who is experiencing the same issues with Xfinity.
TLDR
If you're having issues with performance (speed) and have Xfinity, try removing the device and re-activating the modem again.
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