Forum Thread

Looking for a new modem to feed my Linksys AC1750 router (specifically, on Comcast/Xfinity) at 150MBps

Crew 569 434 November 17, 2015 at 10:25 AM
Hey guys,

Got the Linksys router cheap, and would like to get a fast, reliable modem to get rid of the comcast rental unit.

I'm on the 150MBps "Blast" plan, and would like to see as much of that speed as possible.

Thanks!

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Joined Feb 2005
nolife, no title
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#2
This is the recommended list from Comcast if you are looking to purchase one.

http://mynewmodem.comcast.net/

My SB6121 reached EOL through Comcast was no longer supported so I bought a NetGear CM500-100NAS for $99. There are more future proof models out there for about $30 more but the CM500 seems to be popular and out long enough that Comcast has the provisioning bugs and stability part worked out for some time compared to some of the newest models.
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Last edited by nolife November 17, 2015 at 05:10 PM
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#3
Quote from nolife View Post :
This is the recommended list from Comcast if you are looking to purchase one.

http://mynewmodem.comcast.net/

My SB6121 reached EOL through Comcast was no longer supported so I bought a NetGear CM500-100NAS for $99. There are more future proof models out there for about $30 more but the CM500 seems to be popular and out long enough that Comcast has the provisioning bugs and stability part worked out for some time compared to some of the newest models.
the SB6121 isn't EOL. it was a mistake.

http://mydeviceinfo.comcast.net/?e=1


They say the SB6141 isn't EOL either, but that hasn't been corrected.
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Joined Feb 2005
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#4
It seems they want modems with more channels for management. The SB6121 is limited to 4 downstream channels for a real world capability of roughly ~135 mbps. That is less then the 150 blast service offers. When Fios moved into my area last year, Comcast gave me a 6 month demo of 125/25 service and my SB6121 worked fine with that.

Error or not with the SB6121 EOL, Blast 150 is pushing it.
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Last edited by nolife November 18, 2015 at 09:02 AM
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#5
This is the currently rental that I'm using; "ARRIS DOCSIS 3.0 Residential Gateway (TG862G-CT)."

It seems like the SB6121 and SB6141 are steps backwards, and I don't want to get my 150 service necked down because of the modem.

I would like to get something that is at least a bit future-proof, but don't want to pay $300 to get the Arris new.
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#6
Quote from Crew View Post :
This is the currently rental that I'm using; "ARRIS DOCSIS 3.0 Residential Gateway (TG862G-CT)."

It seems like the SB6121 and SB6141 are steps backwards, and I don't want to get my 150 service necked down because of the modem.

I would like to get something that is at least a bit future-proof, but don't want to pay $300 to get the Arris new.
Do you have VOIP service from Comcast? The TG862G has voice support, if that's something you actually need it will seriously limit your options.

The SB6141 won't limit your speeds on Blast 150. I've got that setup and regularly see 160+Mb/s. If you want something more future proof (and don't need voice support), I'd go with the SB6183.
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#7
Quote from FlashX83 View Post :
Do you have VOIP service from Comcast? The TG862G has voice support, if that's something you actually need it will seriously limit your options.

The SB6141 won't limit your speeds on Blast 150. I've got that setup and regularly see 160+Mb/s. If you want something more future proof (and don't need voice support), I'd go with the SB6183.
Nope, no VOIP.

So with either of those modems and the Linksys router, will I see those kinds of speeds over wifi? I have gotten great speeds with the comcast modem hooked up to my laptop directly via ethernet.

Seems like the speeds slow down when I'm on my phone or using the laptop wifi.
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#8
Quote from Crew View Post :
Nope, no VOIP.

So with either of those modems and the Linksys router, will I see those kinds of speeds over wifi? I have gotten great speeds with the comcast modem hooked up to my laptop directly via ethernet.

Seems like the speeds slow down when I'm on my phone or using the laptop wifi.
It's definitely possible to get those speeds over wifi, but really going to depend on your devices and environment. I do with my laptop with an Intel 7260 AC wireless card, but I live in an apartment with tons of 2.4ghz interference so my devices that don't support 5ghz top out at more like 30-50Mb/s.
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#9
Quote from FlashX83 View Post :
It's definitely possible to get those speeds over wifi, but really going to depend on your devices and environment. I do with my laptop with an Intel 7260 AC wireless card, but I live in an apartment with tons of 2.4ghz interference so my devices that don't support 5ghz top out at more like 30-50Mb/s.
I may have to look into the equipment in my laptop. The router I have is Linksys AC1750 / Cisco EA6500, and I set up separate 5Ghz and 2.4Ghz networks, but I'm in my house so there isn't much interference.

My marked speed in my phone properties is far higher than I actually experience, but I guess that's to be expected.
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