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The confusion here is that there are modem only models as well as modem+wireless access point models listed as options under this product, which is actually 6 different products. All options are a modem/router, but if you also want a wi-fi router, or multiple ethernet ports to connect more computers, get the more expe… see more The confusion here is that there are modem only models as well as modem+wireless access point models listed as options under this product, which is actually 6 different products. All options are a modem/router, but if you also want a wi-fi router, or multiple ethernet ports to connect more computers, get the more expensive option/model listed here that says it has those in the description.
The models that claim faster speeds only speed up data from one computer hard drive to another on your network. Your internet connection speed is set by your service provider. see less
The confusion here is that there are modem only models as well as modem+wireless access point models listed as options under this product, which is actually 6 different products. All options are a modem/router, but if you also want a wi-fi router, or multiple ethernet ports to connect more computers, get the more expensive option/model listed here that says it has those in the description.
The models that claim faster speeds only speed up data from one computer hard drive to another on your network. Your internet connection speed is set by your service provider.

By Amazon Customer on August 28, 2016
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I've had mine since Feb. 2016 and it has been WONDERFUL! Speeds for me are limited by my Comcast service, but I usually get 65 and between 12 and 13 up. Sometimes I get more, and very seldom less. I have FAR less trouble with this than the one Comcast was renting me. If you are worried about support, don't. It is … see more I've had mine since Feb. 2016 and it has been WONDERFUL! Speeds for me are limited by my Comcast service, but I usually get 65 and between 12 and 13 up. Sometimes I get more, and very seldom less. I have FAR less trouble with this than the one Comcast was renting me. If you are worried about support, don't. It is on THEIR compatibility list and they flash it with THEIR firmware, at which point it is their baby to support. It will pay for itself in less than 6 months. I'm glad I didn't get fancy because it does all my service allows and well beyond and my profession is IT. I didn't want a gateway because I didn't wanted to be restricted to the cable modem manufacturer for my routing and wireless. see less I've had mine since Feb. 2016 and it has been WONDERFUL! Speeds for me are limited by my Comcast service, but I usually get 65 and between 12 and 13 up. Sometimes I get more, and very seldom less. I have FAR less trouble with this than the one Comcast was renting me. If you are worried about support, don't. It is on THEIR compatibility list and they flash it with THEIR firmware, at which point it is their baby to support. It will pay for itself in less than 6 months. I'm glad I didn't get fancy because it does all my service allows and well beyond and my profession is IT. I didn't want a gateway because I didn't wanted to be restricted to the cable modem manufacturer for my routing and wireless.
By IT_Architect on May 5, 2017
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The sb6121 only has speeds of 172 Mbps download and up to 131 Mbps upload. This model has up to 343 Mbps download and 131 Mbps upload.
By Andrew on August 27, 2015
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This may be too complex for the average joe, but if you're eager to learn: 8 downstream and 4 upstream channels, or 8x4, refers to the "lanes of traffic" comparison you may have heard with routers.
The concept is very similar to that, where more channels will allow a higher chance of you receiving the speeds promised b… see more
This may be too complex for the average joe, but if you're eager to learn: 8 downstream and 4 upstream channels, or 8x4, refers to the "lanes of traffic" comparison you may have heard with routers.
The concept is very similar to that, where more channels will allow a higher chance of you receiving the speeds promised by your ISP.
More "lanes" prevent you from being slowed down by others during peak hours, like your neighbors for example.
Furthermore, each additional channel enables your ISP to transfer more data to you and vice-versa.
Most modems on the market are either 4x4 or 8x4, but some also allow for 16x4 - you can actually find a few sold here on Amazon.
In short, try to aim for 8x4 modems for now.
In a couple years, more ISP's will likely start using 16x4 as well, you'll start to see more of those modems emerge, and you should then consider those. see less
This may be too complex for the average joe, but if you're eager to learn: 8 downstream and 4 upstream channels, or 8x4, refers to the "lanes of traffic" comparison you may have heard with routers.
The concept is very similar to that, where more channels will allow a higher chance of you receiving the speeds promised by your ISP.
More "lanes" prevent you from being slowed down by others during peak hours, like your neighbors for example.
Furthermore, each additional channel enables your ISP to transfer more data to you and vice-versa.
Most modems on the market are either 4x4 or 8x4, but some also allow for 16x4 - you can actually find a few sold here on Amazon.
In short, try to aim for 8x4 modems for now.
In a couple years, more ISP's will likely start using 16x4 as well, you'll start to see more of those modems emerge, and you should then consider those.

By Tim on July 30, 2015
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Unplug the router for 5-10 minutes. There is a high possibility that you just got D-Dossed so unplug your router for 5-10 minutes to reset your IP address, that should fix it.
By Amazon Customer on August 16, 2016
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i also had a sb6141 in black on order to arrive by july 22 and amazon waited until today to email me to let me know that it would not arrive on time! from now on I will NEVER "pre-order" anything from amazon...
By seetee on July 22, 2015
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This will work with the triple play, HOWEVER, it will only provide you with internet service. You will still need a separate box(called an eMTA) to provide the phone service. Comcast does allow you to do this, but some of the reps are unaware of it. Just tell them you want the internet on a separate outlet with a custo… see more This will work with the triple play, HOWEVER, it will only provide you with internet service. You will still need a separate box(called an eMTA) to provide the phone service. Comcast does allow you to do this, but some of the reps are unaware of it. Just tell them you want the internet on a separate outlet with a customer owned modem. see less This will work with the triple play, HOWEVER, it will only provide you with internet service. You will still need a separate box(called an eMTA) to provide the phone service. Comcast does allow you to do this, but some of the reps are unaware of it. Just tell them you want the internet on a separate outlet with a customer owned modem.
By jimbo on January 28, 2016
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Not with Cox. I use this modem with a 3 TB Apple Time Capsule and TimeWarner cable. No special setup required for this combination.
By Dale W. Mooney on December 20, 2015
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No, I didn't. I have Time Warner. I would call Century Link and ask.
By sher on August 28, 2016