Modems

I just got connected to xfinity internet today with my new SB6183. When I directly connect my computer to the modem, I connect to the internet just fine. When I connect the modem to my wifi router, nothing. Do I need to update any settings in the modem prior to connecting my router? Or is this just a router issue? The router was working just fine 10 min ago connected to my old modem.

I'm an Xfinity internet customer experiencing an issue with my modem's upload speed. While my download speeds are good (around 450 Mbps), the upload speed is erratic, ranging from 0.1 to 1 Gbps within a short time frame.A technician visited my house and checked the coax connections and modem performance. Although they didn't find any obvious issues, they suspected a possible hardware failure within the modem. They temporarily installed a different cable modem, and the upload speed stabilized significantly.The modem I'm currently using is an Arris model purchased in February 2021. Given the technician's suspicion and the temporary fix, I'm considering replacing the modem. However, I'm unsure if this is a common issue with Arris modems or if 3 years is the typical lifespan for such devices.I'd appreciate any advice on whether to replace the modem and what brand/model to consider

printed on its bottom label: SURFboard Model: SB6121Imput Voltage: +12VDC===;0.75ACULS LISTED I.T.E E315754P/N:575186-017-00S/N: [edit: removed personal information]HFC MAC ID: [edit: removed personal information]FCI:001 Thank you. 

I am trying to set up the modem app for my new modem on my computer.  Have it on mobile, but as I am slowly loosing my vision and it’s hard to see most apps on those small screens.  Why can’t I find an install for the computer?  Am I just not seeing it (no pun intended).  Are you able to help with this request?

Can i use S 33 modem with a 300 mps internet plan now. Possible upgrade to 1 gb plan in future..   

So I was using my internet as normal when I all of a sudden lose connection, look over at my modem and it is power cycling, first power lights comes on, all lights under light up and then they all turn off and it repeats. I don’t have any extra power cables for this so I tried the one from my Phillips hue bridge and same thing. I’ve tried to unplug the modem from the wall, tried a new outlet, kept it unplugged for some time and replugged back in, I’ve also tried the reset button on the back which is when the original power cable stopped working completely. Is this just an issue where I need a new power source or is this thing messed up? I work overnight and need to be on ASAP but can’t figure it out. 

I have Xfinity 1000 down/100 up plan for over 3 months. I am connecting PC direct to SB8200 for testing and I only get a max of 24mbps upload. Only 1 (new) splitter and no other breaks in the line to the outside box, which has a new cable to the pole. Download is to spec and fine with no errors.Online Xfinity has reprovisioned the SB8200 at least 20 times and rebooted it at least 30 times over the last 3 months and I’ve logged around 22 hours on the phone with them.An Xfinity tech came to my house and tested everything and said it was all 100% and the reason I wasn’t getting 100mbps upload was likely to be Xfinity not provisioning it right.He verified upload 4 bonded channels at 45 dBmV within spec.To rule out the SB8200 I bought an S33 and had exactly the same result so I returned it.When I call them Xfinity is now telling me that the problem is the manufacturer needs to update the modem and they can do no more troubleshooting until that is done.

Bought the SB8200 on Amazon in February and it said two year warranty. Arris website says it has to be from Arris.com or authorized seller to be valid. So, is Amazon authorized? It’s starting to lose connection after working fine for 7 months. I see others having the same issue, must be built it obsolescence or lack of quality.

Hello - I recently purchased an S33 and have it configured as follows: Spectrum -- S33 -- SFP+ -- Unifi Dream Machine Pro WAN port The SFP+ is a 1-2.5-5-10G model from Ubiqiti. This configuration works just fine when I plug into the 1G port of the S33.  However, when I plug it into the 2.5G port, I get….nothing...no LEDs light up on the Unifi port at all.  The LEDs on the back of the S22 are solid green and amber.  I have tried multiple cables (currently using 0.5m of class 6E), rebooting both the modem and the router, etc., but nothing seems to work.   One other thing that might be relevant is that when it was originally provisioned it was done on the 1G port.  I called Spectrum, and they said that provisioning one port or the other wasn’t something that they did anyway. So, the question is:  how do I “enable” the 2.5G port? Thanks for your help!!

Modem purchased May 17, 2022.  Worked until recently when internet connection would drop several times a day.  Resetting modem several times would restore connection.  ISP checked their equipment and replaced incoming cable because speed was a little slow.  This did not solve problem.  Due to visitors arriving in a few days I purchased a new SB8200 and this resolved problem.  Original modem was purchased at Walmart for $169.00 but they were out of stock when the unit began to fail and replacement was purchased at Best Buy for $138.99.  Both retailers told me to contact the manufacturer to recover the replacement purchase cost.  How do I proceed with this warranty claim?

I posted in here a few months ago about some trouble I was having with my S33. Xfinity ended up coming out and replacing the line from the box to my house and everything has been great until a couple days ago.The random reboots are back. I spent about 3 hours on the phone/chat with Xfinity and they are telling me nothing is wrong on their end and that I needed to contact Arris. I have no splitters or anything else in the way. The Xfinity guy ran the new cable into the basement. We put a brand new coupling on the end, and a brand new cable running to the modem. That is the only coax I use in the entire house. The line from the street goes directly to the modem.I am not sure what is causing these new random reboots, but I suspect I just have a bad modem and need to get a replacement. Its pretty easy to find S33 random reboot topics on the internet, but not a whole lot of fixes.Hopefully someone on here can steer me in the right direction.Thanks

I have been getting 80-120 Mbps on a 1200 Mbps Xfinity service. Yesterday I was told my old Arris is no longer supported, so I replaced with a new Arris S33. My home is 2 stories and ~3500 square feet. My modem and router are upstairs in a bedroom centrally located. I have a Deco M5 Mesh network with 3 stations - one in the bedroom upstairs near the router and two downstairs to reach the rest of the house. With the replaced router, I get 350Mbps in the bedroom and directly below it when testing speed on my iPhone 15 and brand new HP laptop.  I am unable to get my laptop to recognize the Ethernet network when I plug directly into the Arris modem, but it works fine when I plug into the connected Deco router. When I move into the bonus room over the garage, the speed drops by 65% to around 120Mbps. There is an electrical fuse panel below the bonus room and past that panel is where the speed seems to drop significantly. I have run all of the power setting tests that I found in a moderat

Is this easy to set up from Xfinity

SERVICE PROVIDER = COX, 2GB SUPER FAST SERVICECABLE MODEM = ARRIS S33, connecting to the router using the 2.5 Gbps portROUTER = NIGHTHAWK XR700 In order to get the use out of 2.5Gbps service from COX, I have to use the 10 Gbps SPF+ port on my router, else I will still be bottlenecked by the 1Gbps port. I purchased an SPF + transceiver (2 different ones) that both say they are compatible with my Nighthawk/Netgear. When I try to connect this together, I keep getting an error indicating that I cannot get connected to my ISP aka Cox. Put the cable back into the 1Gbps port on the Nighthawk and all is well.  So I have a few hypothesis:Arris S33 will not work with an SPF+ transceiver Cox will not work with an SPF+ transceiver Both transceivers are defective though I do get clear link light activity from both the Arris and the Nighthawk using the

My ethernet port on my SB6183 doesn't work. I try to connect it to my laptop and it just doesn't connect. I'm not sure exactly what to do as the wifi works fine. Any help is greatly appreciated!

I have been talking to my ISP trying to figure my upload speed issue.  I am on the 1000mbps down and 100mbps up plan. However my upload is stalling at 20 mbps.  I am trying to find out what the upload speed capacity of this modem is. My ISP is xfinity. The lights for down is blue (docsis 3.1) my up is green (docsis 3.0) all other lights are solid green and the modem works great other than my upload speed.  can you tell me if this modem is capable for the 100 mbps upload? Is it because they have not activated 3.1 on the upload channel?

How do i get my wifi activated i have a tp-link AC1200 router and i connected it to a surfboard modem but im not sure how to activate it to actually have usable wifi 

Someone has acquired my public Ip that should not have. Is there a way to force the sb6141 modem to acquire a new public IP

S33 v2The modem has been activated and is connected.However, I am unable to login using the default user and password.What is my next step?

When I typed in the web address for the web manager, it went straight to it.  It did not require a login and there is not a tab to change the password.  Is this typical?

Is this a modem issue or a provider issue ?  POwer for upload bonded channels is approx 36.50 dBmV for all four channels as reported by the Modem home page.  Will getting a docis 3.1  modem help or is it just a provider issue. and voltages will also be low for the new modem. Currently I cannot get higher than 12 Mbps upstream

Just moved about 15 min. away, but am in a new zip code. I've plugged in both the modem and the nighthawk router, but I am not recieving internet. I thought it might be an issue on the service provider side of things, so I contacted Xfinity, and they transferred services. However,  I am still seeing "connected no internet" on my devices. Need some troubleshooting help. 

I am wondering if it does support the eero 6+ mesh wifi set because I have not been able to find any answers online.

Logging into 192.168.100.1 does not give me an option to configure the DNS.

Totally ignorant about wifi/modems.  Can you recommend a good extender for use with my SB6190?  Trying to serve a 4500 sq ft house on two levels.