cable modem – Modem Cable – 10 Ft for $12.78

Best deal at: ebay.comeBay

MOTOROLA ARRIS SURFboard SB6183 DOCSIS 3.0 CABLE MODEM (XFINITY COMPATIBLE) 16x4. Condition is Used. Shipped with USPS Priority Mail. Working. At one point another device got hot while it was close to the modem and melted the plastic on one side. Did not impact the function as it ran for about a year after that event. Unplugged and changed ISPs so it will be in working condition.

cable modem – Modem Cable – 10 Ft for $12.78
cable modem – Modem Cable – 10 Ft for $12.78


  1. This products is great. We have Comcast as our provider and service is not good. I refuse to rent their router. My previous router was 6 years old and they kept blaming it on that.. Could not facetime or stream without trouble. I went to Best Buy to get their opinion and they wanted to sell me a separate router and a modem. Cost was over $200.00. Decided to use my prime acct. and check out an all in one router/modem and could not be happier with this product. I am not a tech person but setting this up was so easy. Since I set this up, a week ago, I have not been kicked off the internet or any trouble streaming. I saved well over $150.00 by purchasing this from Amazon.

  2. I have xfinity performance pro which is rated for 150 mb/s down and 5 mb/s up. I’ve been using the Arris SB6141 modem which is 8 channel down x 4 channel up, great modem, no issues but it’s speed maxed out at 120 mb/s down and 5 mb/s up. I figured what the heck might as well get the speed i’m paying for, so I purchased the Motorola SB7621 which is 24 channel down x 8 channel up. Internet speed is now 180mb/s down and 6mb/s up with a ping of 19ms. I am happy that I am now getting the speed I am paying for. Yes the upload speed didn’t change much but that is because xfinity does not support 8 channel up in my area. This means even though this modem supports 8 channel up it only shows 4 active up channels when you log into it, this is not the modems fault, this is xfinity’s doing. The download channels are fine, all 24 channels show up and are active. Yes, I could have purchased a 16 channel down and 4 channel up modem and received the same current speeds but at the time of purchase this modem was less than or the same amount as all the 16 x 4 modems. By buying this Motorola I can upgrade my internet speed down the road and still be covered. Another good thing is that this modem has the Broadcom chipset not the Intel puma.The modem comes with good instructions and is well packaged. Setup was a breeze. I didn’t have to call xfinity. All I did after I hooked up just the modem to my PC was navigate to which brought up the xfinity activation page. Then just log in with your xfinity credentials and follow the prompts. Very easy and welcomed as I didn’t want to sit on the phone talking to xfinity support.I never do reviews but I figured this little box deserved one and hopefully this helps someone.

  3. 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 line3) Connected Ethernet cable to modem and computer4) 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 WiFi6) Opened web browser, and Firefox had a nice little ‘show login page’ button appeared (if this doesn’t show, you can go to Entered my account number and street address8) 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!

  4. This cable modem is a beast (in a good way)! A little over 7 years ago, I bought the Motorola SB6120 to replace the crummy cable modem that Comcast charged me monthly to use. I had no problems with the SB6120, but got an email from Xfinity saying I needed to upgrade my equipment. I guess because they have increased the speed on my service and the SB6120 is so old it may not be supported with updates from Motorola. OK…I paid $75 for the SB6120 and it probably saved me over $750 in monthly rental for 7+ years.Decide first if you want DOCSIS 3.0 or 3.1 because the Docsis 3.1 is new and will probably be usable for years to come. Motorola only has 1 Docsis 3.1 cable modem available today which is the MB8600 and is almost twice the price of the Docsis 3.0 MB7621. If you compare the specs, the MB8600 is faster but at nominal 1000 Mbps and Comcast certified 400 Mbps, the MB7621 is way faster than my 150 Mbps service.I got it today and got it activated and hooked up to my new Motorola MR1700 router. The process was fast and easy if you can figure what they are trying to say in the quick start guide. I activated with my notebook directly connected to the cable modem and the speed exceeded my 150 Mbps service by almost 30%. After direct wire of my notebook through the router, my speed was also exceeding my service speed at the same level.The only way I can lose on this purchase is if Docsis 3.0 becomes obsolete in less than 8 months and I’ll bet that is unlikely.

  5. Reply
    Audiophile Headcase
    June 7, 2018 at 12:00 am

    This Motorola MB7621 cable modem was a huge disappointment. I bought it to replace my four year old Arris SB6141 which is a 8×4 modem. The MB7621 is 24×8 so in theory it should give better performance. However, the performance I saw was much worse than the older SB6141 with download speeds. I have Comcast Performance Pro 150mb service and was routinely seeing about 100mb in real life with the old modem. When I put this new cable modem on the coax the download speed consistently dropped to about 32mb. The signal levels all looked good and there weren’t any uncorrected codewords. It appeared that 23 of the 24 available download channels achieved a lock. After spending several hours playing around with settings, etc, and chatting with Comcast “support” (useless) I had to assume that it was somehow defective. Back to using my trusty old Arris SB6141, hopefully for a few more years. I noted another reviewer also saw speed slowdowns on this modem. Even though it is listed as being Comcast Xfinity compatible it certainly did not work for me.

  6. 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!

  7. NETGEAR Nighthawk WiFi Cable Modem Router+ Voice (24×8) AC1900 DOCSIS 3.0 | For Xfinity Internet and Voice services (C7100V-1AZNAS). I am not really rating the AC1900. I purchased this modem/router/phone to replace my Comcast unit I had been renting for 3 years at $11/mth. I received the Netgear AC1900 follow all set up instructions….call Comcast tech support…only to find out the unit was showing up on a customers account and could not be activate. Shame on you Amazon for selling me a used device as a new one and at new retail pricing. The next day I bought the same unit for $20 more…went through the same setup and it worked fine…my Wifi download speeds are double what they were with the Comcast Unit. The unit is great….paying for a used unit at NEW retail pricing is bad business and I could not activate it.!!! Will look at other options than Amazon when buying items now!

  8. This modem was great and behaved exactly as advertised, but only for two months. I started to notice spotty internet last week and blamed it on Comcast and then my internet went completely out 3 days ago. All the modem lights were on, my router was working fine, but I couldn’t get internet. The Comcast technician came over for an hour today until we finally realized the modem wasn’t responding correctly so I replaced this with my old modem and got my internet back.So there you go bought Jun. 13, officially dead Aug. 14. Outside of the return period and now I’m stuck with a paperweight. The technician also warned me against Netgear modems too, he said they tend to fail earlier. I do NOT recommend getting this you can get cheaper more reliable modems (Arris). Thanks Netgear for disappointing me, you’ve lost a fan.

  9. Modems and routers should be easy, plug them in, follow some prompts, and set up your wifi names. These days, most companies make a product that is user friendly and once they are set up, they run forever.I bought this model because I switched to Xfinity and I did not want to rent a modem and router from them. It worked great from March of 2018 until November of 2018. And then they did a firmware update. Xfinity went above and beyond to try and help me figure out why my internet kept goint down. It went down four, five, eight times a day. When it came back up, I still could not get to the internet. They pointed me to a firmware update and then I knew what I had to do.I called Netgear for support. Guess what? They install software on your modem that turns it into a brick and then they tell you that there is only 90 days to technical support. 90 days. 90. When the modem reboots, and this is why I kept losing internet service, the modem goes back to the point it was at when it came out of the box. This means you have to go in and change the wifi names again, change the passwords, and then your internet will work for an hour or two. You also have to go put in the password for the network you set up on all your devices because things have changed.I will never, ever buy another Netgear product again. Ever.

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