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Most Recent Questions
Recent Question:
will it work with windows 8
Recent Question:
Internet is down in our facility. Can we connect this hotspot via Ethernet cable to out device?
Recent Question:
Do I need an internet provider for it to work? Does it already have internet built in?
Recent Question:
Are there additional ports on this modem?
Questions with Most Recent Answers
Question:
WILL IT WORK WITH TIME WARNER CABLE INTERNET SERVICE?
Question:
does this modem use a co-axial cable
Question:
Does this router work by just plugging in the Ethernet cable
Question:
Can you run this on Windows OS?

Customer Questions & Answers for
Motorola ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem

The Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem unlocks the potential of offering innovative high-bandwidth data and multimedia services. Utilizing the power of DOCSIS 3.0, the SB6121 enables channel bonding of up to four downstream channels and four upstream channels, which allows an operator to offer their customers advanced multimedia services with data rates of well over 100Mbps in each direction. The Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem provides an economic option for providing Ultra-Broadband services, with four times the current maximum user data throughput approximating 160Mbps in DOCSIS mode and 195Mbps in EuroDOCSIS mode, without the need for hybrid fiber coax (HFC) plant upgrade. Maximizing an operator's current infrastructure investment, the SB6121 can be deployed without service interruption.
Customer Questions & Answers:
97 Questions
 | 
376 Answers
Overall Rating:
4.613 out of 5
4.6
out of
5
Product Details

Questions & Answers for Motorola ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem

Question

Can this be used with cableone?

asked 1 year, 3 months ago
By
crj
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
2 answers
Answers
answer 1
Yes
answered 10 months ago
By
Cryptkeeper
answer 2
Not sure, but if they need a DOCIS 3.0 modem, this should do the trick.
answered 1 year ago
By
ranman66
Question

Does this model have Coaxial Cable; I saw that there was only Ethernet and Power Cable in the Kit?

asked 1 year, 11 months ago
By
Dev
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
10 answers
Answers
answer 1
No. The coax is the cable your internet provider runs to you house.
answered 1 year, 5 months ago
By
jww62
answer 2
The coaxial cable is the one that comes through the wall and provides your cable service. This modem has the jack to connect that cable.
answered 1 year, 8 months ago
By
pffffffffffft
answer 3
You will need to purchase the coaxial cable seperatly. Measure the distance from hook up to you computer to make sure you buy a long enough cable.
answered 1 year, 9 months ago
By
nannerkz
answer 4
there is no coaxal cable in this kit, must purchase seperate!!!
answered 1 year, 10 months ago
By
DonHam
answer 5
The product does nto come with the Coaxial Cable.
answered 1 year, 10 months ago
By
Malcolm59
 - Southampton, NJ
answer 6
it does not come with a coax cable, you must provide your own.
answered 1 year, 10 months ago
By
Hanztertonfield
 - NJ
answer 7
No. The cable company usually supplies the coaxial cable
answered 1 year, 10 months ago
By
Throckmeister
answer 8
Yes, there is a coax connection on this model.
answered 1 year, 10 months ago
By
TheGuynMD
 - Baltimore, MD
answer 9
According to the spec sheet there is an "F" connector which means yes, coaxial cable can be connected to this modem. This would be expected since this is a cable modem.
answered 1 year, 11 months ago
By
an anonymous customer
 - Oak Creek, Wis.
answer 10
No coaxial cable.
answered 1 year, 11 months ago
By
salem974
 - Peoria, IL
Question

Does the Motorola modem sb6121 have a router built in?

asked 2 years ago
By
garry1988
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
9 answers
Answers
answer 1
No. If you want to connect it to more than one computer you will need a router.
answered 1 year, 8 months ago
By
pffffffffffft
answer 2
no, this is a cable modem that will plug into your computer. If you want to be wireless you will need to buy the wireless router seperately
answered 1 year, 9 months ago
By
nannerkz
answer 3
No It Doesn't have a router as Walmart advertised, I am so glad my Apple Extreme Wireless Router Does have ports!!!!
answered 1 year, 10 months ago
By
DonHam
answer 4
Not this model.
answered 1 year, 10 months ago
By
Malcolm59
 - Southampton, NJ
answer 5
this model does not have a built in router.
answered 1 year, 10 months ago
By
Hanztertonfield
 - NJ
answer 6
No it does not. You will need to plug this modem into a third party router i.e. Linksys, D-Link, Netgear
answered 1 year, 11 months ago
By
netrrhexis
answer 7
Not this one but I was reading that Moto has one combo unit modem/ router but the reviews are not that good and is more pricey ...
answered 1 year, 11 months ago
By
EVegas
 - North west Las Vegas NV
answer 8
Nope, this is a cable modem only. You can of course connect your choice of wireless router. cheers.
answered 1 year, 11 months ago
By
johnetx
 - west texas
answer 9
Nope, this is a modem only, of course you can connect your choice of wireless routers. Cheers.
answered 1 year, 11 months ago
By
johnetx
 - west texas
Question

Does this have a built in phone jack?

I need a modem that has that capability since my phone co uses cable thru' a modem.
asked 1 year, 11 months ago
By
mustangchar
 - Fosyth, Mo
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
8 answers
Answers
answer 1
It has an rj-45 jack, which is a standard telephone jack.
answered 1 year, 8 months ago
By
pffffffffffft
answer 2
It has 3 plugs. 1 to hook coxial cable, 1 for the power cord and one for the ethernet cord that will plug to other divices such as a computer.
answered 1 year, 9 months ago
By
nannerkz
answer 3
No, If your on TWC you keep the TWC issued modem at no charge for your phone service and the SB6121 modem will now be your internet modem!!!
answered 1 year, 10 months ago
By
DonHam
answer 4
No
answered 1 year, 10 months ago
By
Malcolm59
 - Southampton, NJ
answer 5
this modem does not have a phone line.
answered 1 year, 10 months ago
By
Hanztertonfield
 - NJ
answer 6
No phone jack
answered 1 year, 11 months ago
By
EVegas
 - North west Las Vegas NV
answer 7
Yes, I have Vonage and it goes through the Internet also.
answered 1 year, 11 months ago
By
samdu
 - Detroit, MI
answer 8
No, this is strictly a cable modem. Note - this is NOT compatible with dsl or Uverse.
answered 1 year, 11 months ago
By
johnetx
 - west texas
Question

Does this modem work's with Comcast?

asked 1 year, 10 months ago
By
CH
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
7 answers
Answers
answer 1
Yes.
answered 1 year, 8 months ago
By
pffffffffffft
answer 2
works fine with Comcast
answered 1 year, 8 months ago
By
dhgott
answer 3
This modem will work on any cable TV system that provides internet over the coax cable connected to the home. It will not work on DSL internet provided over phone lines such as provided by CenturyLink.
answered 1 year, 10 months ago
By
Tex999
 - Mesa, AZ
answer 4
Yes
answered 1 year, 10 months ago
By
Malcolm59
 - Southampton, NJ
answer 5
Yes it works with Comcast.
answered 1 year, 10 months ago
By
Malcolm59
answer 6
It should because it is a DOCSIS 3.0 Cable Modem but be sure to call Comcast to be a 100 percent sure. It is a great modem, I love it.
answered 1 year, 10 months ago
By
Mrclutch1987
 - Roanoke, VA
answer 7
yes. in south nj it does, and likely everywhere. I installed mine a couple weeks ago and it works great. just be patient on initial start up where a comcast rep adds it to the network. it is on their list of accepted modems, and they rank it high for compatibility.
answered 1 year, 10 months ago
By
Hanztertonfield
 - NJ
Question

does it have a phone jack?

need modem for time warner with cable,ethernet, and phone jacks
asked 1 year, 9 months ago
By
russ
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
7 answers
Answers
answer 1
No, it does not have a phone jack (RJ-11). Ethernet (CAT5), Cable (coaxial) and power adapter connections only.
answered 1 year, 8 months ago
By
qcoats
answer 2
This modem does NOT have a phone jack. Ethernet, Cable (coaxial) and power jacks only.
answered 1 year, 8 months ago
By
qcoats
answer 3
Yes, it has a standard rj-45 phone jack.
answered 1 year, 8 months ago
By
pffffffffffft
answer 4
NO
answered 1 year, 8 months ago
By
WESTERNHILLS
answer 5
No.
answered 1 year, 8 months ago
By
Kelita909
answer 6
No phone jack just Ethernet
answered 1 year, 9 months ago
By
Timdoggg
answer 7
No, this modem only has an ethernet jack
answered 1 year, 9 months ago
By
elcheapo1953
Question

Do you have to have existing cable service? Looking to get internet service through this modem..

asked 1 year, 10 months ago
By
Leelee
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
7 answers
Answers
answer 1
Yes
answered 1 year, 5 months ago
By
jww62
answer 2
Yes, you must subscribed to a broadband ISP (internet service provider).
answered 1 year, 7 months ago
By
Cyberodney
answer 3
Yes, you need cable service, the modem will not magically provide free internet.
answered 1 year, 8 months ago
By
pffffffffffft
answer 4
Most Cable Companies Offer Internet only for a higher price per month
answered 1 year, 9 months ago
By
elcheapo1953
answer 5
Depends on the provider. I have Cox and only have the internet with them.
answered 1 year, 9 months ago
By
nannerkz
answer 6
Yes, you should have cable service and after installing, call your cable service to give them the numbers they need to make sure it is hooked up and ready for you to go on the internet.
answered 1 year, 9 months ago
By
angelblossoms
answer 7
work perfect with comcast cable internet
answered 1 year, 9 months ago
By
neatrose
Question

Is this modem wifi capable without a router?

asked 1 year, 1 month ago
By
Bill
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
6 answers
Answers
answer 1
No. This is just a cable to ethernet interface.
answered 8 months ago
By
JustAnAnonymousReveiwer
answer 2
I use a wifi router with mine, doesn"t give a wifi signal from the modem
answered 10 months ago
By
gifts96
answer 3
No
answered 10 months ago
By
Diamond70
answer 4
No, you will need to add a wireless router for Wi-Fi
answered 11 months ago
By
HiDefPCs
answer 5
No, you will need a router to set up a Wi-Fi network.
answered 1 year ago
By
ranman66
answer 6
This modem does not have Wi-Fi capability. You will need a router for that. I recommend getting one regardless.
answered 1 year, 1 month ago
By
TechieLifter
Question

Is this model compatible with Time Warner Cable internet service?

asked 1 year ago
By
sami
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
6 answers
Answers
answer 1
Yes. If you go to TWC website, it will tell you which service it works with. We have the basic service and this was one of the modems suggested. If you have an upgraded service, you want another one, but the website gives you suggestions.
answered 10 months ago
By
djmelmom
answer 2
Yes, I use it with a Netgear router. It works fine with TWC.
answered 10 months ago
By
gifts96
answer 3
yes, works for me!
answered 10 months ago
By
unknown2014
answer 4
Yes, it can be found on there compatibility list.
answered 10 months ago
By
Diamond70
answer 5
Yes. You'll probably get a faster connection when you swap out the Time Warner modem for this too! I did.
answered 1 year ago
By
NicknamesTakenByOthers
answer 6
Yes, it even works better then there's and when I called to get this one going I had a tech named Joe,he really was good and in less then 20 minutes it was all done and I was good to go.
answered 1 year ago
By
thelady65
Question

is this a wireless modom and router

asked 7 months ago
By
robbby
on ARRIS/Motorola SB6121 SURFboard DOCSIS 3.0 Cable Modem
6 answers
Answers
answer 1
No, it is ONLY a cable modem.
answered 5 months, 4 weeks ago
By
BaltimoreFan
answer 2
no
answered 6 months ago
By
WALLYMARTCTMR
answer 3
No
answered 6 months ago
By
duncanville1
answer 4
Yes.
answered 7 months ago
By
CommunityAnswer
answer 5
No this modem is not a wireless modem and router but can be used in conjunction with a wireless router.
answered 7 months ago
By
reviewbyron
answer 6
modem only. not wireless.
answered 7 months ago
By
PFJOregon
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