Features:

  • COMPATIBLE WITH XFINITY INTERNET & VOICE SERVICE: Certified by Comcast for Xfinity. NOT compatible with Verizon, AT&T, CenturyLink, DSL providers, DirecTV, DISH and non-Xfinity voice services.
  • SAVE MONTHLY RENTAL FEES: Model CM1150V replaces your cable modem saving you up to $150/yr in equipment rental fees.
  • BUILT FOR ULTIMATE SPEED: Best for cable provider plans up to 2 Gigabits speed.
  • WORKS WITH ANY WiFi ROUTER: Connect any WiFi router to this modem's ethernet port to support all your wireless devices.
  • VERSATILE CONNECTIONS: 4 Gigabit Ethernet ports give you fast wired connections to your computer, separate Wi-Fi router, printer, game box, and other devices.
  • VOICE PHONE SUPPORT: For use with Xfinity Voice service and up to 2 telephone lines with enhanced call features including caller ID, 3-way conference calling, call forwarding and more.
  • MODEM TECHNOLOGY: Engineered with 32x8 channel bonding, OFDM 2x2, and DOCSIS 3.1.
  • MULTI-GIG ETHERNET: Link aggregation combines two 1G ports into one 2G port for faster wired ethernet speed.
Works with Optimum and works well

If you're here looking to see if this works with Optimum, you're probably in the same boat that I am in. I've been with Optimum for over 15 years and never ever paid modem fees, then last month I get the bill and Bam, I'm now being charged for it. I called probably like you did, stayed on the phone for 50 minutes, just to be told that it was something that they had to do... Which meant that it was nothing I could do. So the second I was off the phone I came to Amazon to find the right modem that will indeed work with Optimum and this one does and not only does it work, but it's 300 times better than the one that optimum offered. I have the 400 speed package which in the highest that they offer for the Bronx. I was getting no more than 355 on a good day and once I connected this modem I was getting 455, and even the customer service agent was shocked and let me say this, it has been consistently giving me those numbers. Netflix and my Amazon TV has been working without delays or those slight annoying hiccups, and everything has been working so much smoothers when it comes to streaming and also a major notice of improvement on my Xbox one x which for some reason would lag even with the speed I am getting, so it was a headache to play state of decay. Not it works so smoothly, so I highly recommend this modem completely. Don't hesitate , this is the one to get

Instant speed upgrade!!

This is the best purchase for modem, I currently had (ARRIS SURFboard SB6121 4x4 DOCSIS 3.0 Cable Modem pair with router NightHawk X10) and start failing me with speed dropping completely to 0MB/s at times. Tested by connecting it directly modem to desktop and was getting same speed dropping. I have Blast (250MB/s DL & 10MB UL/s) speed from Xfinity Comcast, with the old modem didn't see speed higher than 135MB/s DL. That wasn't bad until it started to failed, then I realized that it has not been my IP fault I wasn't getting the full 250MB/s, it was me with an older modem with top DL of 175MB/s capable. I started to research to see what modem to buy and since I already have the router Netgear NightHawk X10 and no problem, I look into netgear modem and read the awesome review this one has, so I decided to go for it. Installed it and the first speed test I did it blew my mind with speed of almost 300MB/s DL!!!! Now it is a steady 250MB/s DL speed (+/- 30MB/s) I turn every device and streamed HD videos some ULTRA HD and not one ever buffered. 100% Recommend this product worth every penny ($179.99 + tax)! Bought Friday 27th 2018.

Great DOCSIS 3

Great DOCSIS 3.1 modem. I upgraded from an Arris 3.0 when Cox Gigablast became available in my neighborhood. With this modem I'm getting almost full gigabit download speeds! It was cheaper than any other brand, and Amazon delivered it quickly. Highly recommended!

There's good news and bad news here - mostly good

The second modem I received from Amazon has been installed and is working very well. Three years ago, I decided to stop paying Comcast's rental fees and purchased my own modem: an Arris tg862g. That one was also purchased from Amazon and did a nice job for three years (though it appears to be end-of-life now). I decided to purchase a new, faster modem to update my system and came across this one. I didn't want a router because I plan to install a Google Wifi mesh system to help eliminate internet slow spots in my house. I decided to go ahead and get a telephony modem even though I don't use the phone part of Triple Play because I didn't want issues with Comcast. The good news: The installation of the Netgear took about 2 hours. I followed the "Quick Start" guide which came with the second modem, and probably didn't wait long enough for the modem to totally start up before I plugged my computer into the modem. When I tried to call the two phone numbers provided, I didn't get a prompt that allowed me to talk to someone about activating the modem - the phone system would not take "activate modem" as an option. Comcast's own website says that after plugging in the computer, I should have been automatically sent to an activation page. That didn't happen, and putting "xfinitiy.com/activate" into the browser didn't work to get me to an activation page either. So I reinstalled my old modem and started a chat with Xfinity. The guy asked for all of the information that's noted on the Quick Start Guide (make and model number, serial number, MAC address), and then went away, telling me to stay on the connection while he activated my modem in their system. After 20 minutes of waiting I asked if he was still there a few times - no response. So I stopped the chat, installed the new modem, and plugged my computer in, and got to the activation page immediately. A code was texted to my phone and it seemed to be up and running but sadly only for 10 minutes. Then dead again. This time when I called the Xfinity phone number, one of the options was "connectivity issues", which I picked. The computer re-booted the new modem. and all seems to be well. It seems that people have had luck using the "plug and play" method, but my modem required a bit more intervention. Comcast's phone system is still a hurdle but don't despair, it just requires persistence. I had several hiccups when I set the Arris up three years ago, too. So what's the bad part? The modem I installed was the second one I got from Amazon. Here's the story of the first one. When I opened the brown shipping container from Amazon, I knew there was a problem. (1) The Netgear's box was unsealed, and (2) the flap to open the box was torn. (3) the modem was scuffed and dirty, and (4) the power cord was partially wrapped around the power "block" and the rest was stuffed in haphazardly. I didn't realize until I got the second one that a couple of other items were missing from the first one: (5) there was no Quick Start documentation in the box, and (6) the phone cord was missing. I decided that I had gotten a used item that had been installed and could have been defective, which is why it got returned. I really didn't want to try to install a potentially defective modem - installing a perfectly good one is a lot of work and aggravation and the chance that the first one was bad was too much of a risk for me. I don't have any problem ordering a returned/certified item but this one clearly hadn't been looked at to make sure it was in working order. I returned the first one as "damaged" and requested a replacement. The second one came quickly and was sealed and brand new. My review of the first modem was rejected by Amazon (not within their guidelines) but I thought I'd put the particulars here in case Amazon tries to charge me a restocking fee because there are items missing in the box I returned. And also in case this happens to someone else too.

Average Guy, not a techie

We have Comcast, this modem is supported by Comcast and it’s super easy to set up. It took less than ten minutes. If you have Comcast there are specific instructions to set it up. Very easy. The modem works so far. Our internet speeds are where they are supposed to be. Stop renting your modem and buy it! As for technical stuff I have no idea what any of it is without googling something. I paired it with a LINKSYS EA7300 wireless router and am now enjoying way better connectivity.

So I opted to get a new modem and a new router so that I could have better control of the devices

After buying a new 4K TV I realized that the ISP's modem/router combo with built in wifi wasn't cutting it. So I opted to get a new modem and a new router so that I could have better control of the devices. This device was easy enough to set up. Once I installed it I tried to use Comcast's useless self install feature. It kept asking me if I wanted to bring over the old wifi settings as if this were a router. So it wouldn't let me specify that it's just a modem. So I had to call support directly. I had the guy change me over in their system (he commented that this is a great modem and that lots of customers are getting them) and then I waited the usual 10-15 minutes for it to start working. So far I've had it over a month and it hasn't needed a single reboot. Download speeds from Comcast are rated at 250Mb's but with this modem my speed test hits about 300 every time.

No more cable modem rental fees for me!!

It was time to start trimming my Time Warner Cable bill. So, I purchased this puppy. Yeah, it has a cheap price tag, but this little baby packs a punch. I pay for the Extreme package via Time Warner. I was averaging 80 megs down. After installing this and getting it activated, my download speeds are averaging over 115 megs down - that's both wirelessly and hard-wired. The setup is simple. 1. Remove your current cable modem. 2. Put this one in it's place. 3. Hard-wire it to a laptop or a desktop (yellow cable to the yellow port on back of cable modem, the other end to the internet port on your laptop or desktop. 4. Power on the modem (making sure you have already connected the coaxial cable as well. (When the globe stays a solid green with no blinking, it is recognized as being connected. 5. Turn to the activation page in the mini manual that comes with it. It will show various internet providers and their perspective links. 6. Open up a browser (with pop-up blocker offf) and follow the prompts. Odds are in favor you will get "due to your account settings, this will not work - call the 1-800 number shown." That's okay, call it. Tell the operator you are installing your own cable modem. The operator will ask for the MAC address (found both on the box and bottom of cable modem). Agent on the phone will first remove your current cable modem from your plan (or else, this will never work). You will power it off upon request, and back on again 30 seconds later. Go to a website of choice - and wa-la, you are back online!! No more cable modem rental fees!! BTW, I work in the IT field, and have for 25 years. This will be all the modem you ever need unless you plan to go over 450 megs in the future. I have the following items that may be online at any time and all at once: Xbox One, PS3, Two laptops, One desktop, one cell phone, and one tablet. I can play Netflix on all devices (4 at once since that's my Netflix account package), and there is no buffering at all. I bundled this with the Netgear WNDR4500 Dual Ban Gigabit Wifi Router. Here's my layout. Cable Modem feeds the router. The router feeds my 16-port switch. I work on computers on the side, so the switch comes in handy. Any questions? Feel free to ask me. Trim your cable bill and get this or any cable modem for that matter. Note, this is a cable modem only that does not supply wifi. It only has the internet-out port. There are no other ethernet ports on it. So, upgrade your router or get one. The model I mentioned above is a great match. You are welcome!!

Bam! Saved $11/month in 2 days and 5 minutes! (UPDATED 4/5)

Five minutes after arriving on our doorstep, the new cable modem is up and running. Bracing myself for difficulty with Comcast, I was pleased at how easy setup was without ever having to speak to Comcast's clueless CS. Using a laptop with an Ethernet jack, here's how easy it was: 1) Wrote down my Comcast account number (This is the MOST important step!!!) 2) Connected modem to cable, power, and phone line 3) Connected Ethernet cable to modem and computer 4) Waited three minutes for the first three lights to blink steady (they'll blink and flash while the modem is syncing. You could wait up to 10 minutes for sync). 5) Turned off WiFi 6) Opened web browser, and Firefox had a nice little 'show login page' button appeared (if this doesn't show, you can go to xfinity.com/activate) 7) Entered my account number and street address 8) The modem reset itself. I plugged that into my Luma and we were off to the races! Ironically, Comcast sent a new tower modem a week ago. I don't know if it's me, but this seems faster than that did - speed about the same but ping time is now 9ms instead of 14 and pages that seemed to load slowly before pop in immediately. Biggest bonus is that we're saving $11/month going forward. UPDATE: 4/5/18 - Everything was working perfectly until Comcast turned off my service this weekend because the modem wasn't registered in the right database and Comcast thought I had no equipment. Object lesson: After activating online, call Comcast to make sure the equipment has registered across all of their databases - 5 minutes could save you 2 hours! The modem, however, is working flawlessly and I still highly recommend it!

Easiest cable modem replacement ever

Like most people reviewing the Netgear CM1000, I was swapping out the Comcast Xfinity supplied modem after recently upgrading to their Gigabit plan. I did a little research before hand and found that the previous model (cm700) and a lot of other Docsis 3.1 modems manufactured in 2017 were defective due to the reliance on an Intel-based chipset known as the “Puma 6”. Before ordering, I got detailed technical specs and found the CM1000 uses a broadcom chipset, thus removing any concerns. There’s really not much to say other than: Easiest modem swap ever. Total time spent installing the new modem: 5 minutes. Product manual comes with a list of modem activation URLs for both Xfinity and Cox on the back of the manual (I didn’t need it, however). No issues, no loss in connectivity, no loss in throughput. Just like it should be!

Using the CM600: What it is; what it isn’t, and why that’s a good thing

The Netgear CM600 cable modem is an ultimately reliable DOCSIS 3.0 cable modem for service speeds up to 300 Mb/sec or faster. Unlike the company’s CM700 model, it does not incorporate the troublesome Intel Puma 6 chipset found in many higher-end cable midems, making it a more reliable choice. There may be a downside for some, having little to do with the CM600. When accessing the CM600 interface, it is noted that ALL firmware upgrades can only be provided by the ISP (in my case, Spectrum). Whether Spectrum will upgrade said firmware (when and if necessary) is questionable, though it would be to their advantage. It has also been explained that Spectrum cannot remotely troubleshoot issues in “non-standard,” cable modem/routers. These being anything other than the standard free cable modem/routers Spectrum installs as part of their service. They can, however, initiate a reboot and validate that the CM600 is functioning. Funny, this seems more like a positive for me! As a trained network support technician, I like the idea that Spectrum cannot manipulate the settings of either my modem or router; something I am more than capable of doing on my own. Setting up the Netgear CM600 cable modem is as easy to setup as plugging it in and turning it on. The CM600 was fully functional within seconds of connecting the Internet cable to the back. The CM600 is a one-trick pony; it is a cable modem and nothing else. It converts cable data into Internet data. Given the specifications and the high-quality components it does its particularly job incredibly well. The CM600 is built to pull a signal out of a weak or “noisy” line. It will continue to provide Internet service when other lesser modems will drop out. Since purchasing this modem, I have had no random cable dropouts from my ISP. Remember, it has no built-in wireless or wired router. Such a router must be purchased separately. A quick aside: The router is the Grand Central Station of your home’s WiFi universe. It takes a tremendous amount of efficient but fast processing power to send and receive multiple data streams quickly and effectively between a houseful of smartphones, smart HDTVs, computers, tablets, cameras and other WiFi-enabled gizmos and the Internet. A router is a radio transceiver. The more powerful it is, the more information it can send through the air over longer distances. The more sensitive it is, the more it can pick up data being transmitted 500+ feet away. To get the best benefit from your Netgear CM600, I recommend the Netgear Nighthawk® R7000P. Built to handle the needs of the tech enabled home, it is a stellar dual-processor performer at an incredible price. No. I don’t work at Netgear!

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