NETGEAR Cable Modem CM400 Compatible with Cable Providers Xfinity by Comcast, Spectrum, Cox | For Cable Plans Up to 100 Mbps | DOCSIS3.0, Black (CM400-100NAS)

Time Warner charges a monthly fee for provided modems but allows customers to purchase their own modem as long as it's on their approved modem list. I purchased this Netgear Modem to lower the cost of my monthly Time Warner internet charges. It will take about 13 months for it to pay for itself. I'm sure it will last much longer than that since I have always had luck with Netgear products. It was very easy to install. I just took the cables off Time Warner's modem and attached them to the new modem. The initial boot-up of the modem took about 5 minutes to complete but the manual said it could take up to 15 minutes. After the initial boot-up I had to call Time Warner to activate it. That process took me about 10 minutes on the phone with a Time Warner tech. The manual lists all the supported cable ISP's along with websites and 800 numbers so you can easily contact your ISP for activation. The manual also includes suggested dialog to use when talking with the tech to make things easier. Comcast customers can activate their modems via Comcast's website. I did a speed test after the activation and everything was as expected.Pros:Nice Design, Matches the rest of my Netgear equipment.Easy to setup.Clear instruction manual.Lowered my monthly internet bill.Can login to the router for configuration, logs, and statuses (Could not with my TW Modem).Cons:None so far.

The CM400 is primarily a simple device to install. Due to the restrictions placed on us by the cable provider, i.e. firmware updates, a particular downstream channel frequency and the like, there is however only one controlling feature for us to modify. Compared to the many other units I've used this cable modem does allow us to at least find a starting frequency then locking into a channel best suited to my custom router/networking needs. It does take a few extra tries to find that one frequency I'm looking for, that's the one controlling feature I like that Netgear gives us. My regional cable provider is not always in alignment to my speed freakish needs limited to 110Mbps. :<(' The CM400 is a very reliable and sound unit. Bought April 2017, over a year of quality service.

First one out of the box set up easy but within 24 hours started constant cycling to find connection. Took over a half an hour to get to a Netgear tech and 2 to 3 hours of trying everything he could think of, including re-flashing the firmware, with the end result being getting issued an RMA for a replacement unit. Took 5 days to get the replacement although I asked for expedited shipping. Set up for the replacement unit was easy and it's been running just fine for a couple of weeks with no problems. So far so good. It's hooked up to a Netgear N600 wireless router and the two seem to talk to each other with no problems.

I recently signed up for a new account with xfinity internet and I knew it would be a better option for me to save some money and order a cable modem instead of leasing one of theirs. After hours of searching I found my self purchasing this product because of it's affordable price and the fact that it has a wireless router built in. Since the modem I purchased was refurbished I was a bit skeptical that I would have complications setting it up because the serial number was scratched out with a permanent marker. But thankfully I can an easy set up with xfinity because they only needed the MAC number for set up. The instillation was quick and easy, I could have not been any happier with this product! I have had this for 2 weeks and the internet has never been faster. I haven't experienced any issues thus far.

No complaints about functionality. When I purchased this modem less than 1 year ago, the description said it would work with Oceanic Time Warner (OTM) I was told that it was rated at 340MBPS. At the time I was considering upgrading to faster upload speeds. I am now upgrading to 200 MBPS service. OTM and they tell me this modem is too slow and that I need a modem rated at 300 MBPS, such as the C3000, C3700 or C7000. I am not a computer genius, but this seems to be a conflict of specifications. I feel that either Amazon or Netgear should give me credit for this purchase toward an upgrade, or educate OTW if it is their misunderstanding. I am willing to upgrade, but feel that I have been misinformed by someone. I realize that technology is advancing, but a purchase 11 months ago should still be usable at the specified speed.

Greate ,Cheap , easy to set up , and works perfect !Perfect modem if you use Internet on your ps4 or phone and want a stonger connection for multiple devices . Has 3 total wires in the box it comes in. I baught this not realizing it didnt come with built in wifi connection, i still needed to hook up to a wifi modem, it still was perfect since I had a wifi mode already. It was good deal i couldn't pass up ! It connected cox internet service perfectly - Has normal modem issues that you normally expect once in a blue moon , always a common thing when dealing with technology , you can restart the box and the connection will be fixed. 2 months now and still going strong .Update: still runs perfectly one year later !!Hope this helped anyone !

We liked how easy it was to setup.