Sb6183 receive/downstream only blue light?

The blue receive means it has bonded multiple downstream. If the upstream is only green, then it is not bonding. You could have a signal issue. Even if the Internet does not work, you should be able to access the modem at 192.168.100.1 to check the signals.

Manual if it's helpful:

https://usermanual.wiki/Arris/SB6183.882824551/html

Thanks Andy

If it’s a signal issue would it still be pointing to a connection problem in the house or outside?

I can access the modem but I’m away from it now. What should I look for when I check the upstream info?

thanks again

Mainly checking the signal levels. Your upstream may be so high that it cannot bond multiple channels, and even the one it's on may be too poor to work properly. Typically, downstream signal levels should be around +/- 10dB, with an SNR of 33 or better. Upstream should below 50-51.

FWIW...

I had a SB6183 for years before upgrading to a SB8200.

On both modems, I always had blue downstream and green upstream during normal operation.

I believe the blue color means you have an OFDM connection on that stream, and I've never seen an upstream OFDM connection.

HTH

The 6183 is a D3.0 modem, and blue means it is bonding channels in that direciton. The 8200 is a D3.1 modem, and blue means it is using OFDM in that direction. Comcast is just testing out upstream OFDM in a few rare areas, so 99.9% of users will still see green upstream.

Just to add on the OFDM upstream: Those Comcast tests are currently only for their own XB7 and XB8 users right now.

Maybe that explains some of the really weird issues that XB7 and XB8 users are having lately.

[grin][wink]

I’m still not back yet to check the up/down power. But if I were to replace this sb6183 which modem should I get

Here’s the status report. I still don’t have internet. The local network is working so I am able to connect to the modem. The lights are solid green for power/upstream/online , and solid blue for downstream. 

There are many modems. You do want a DOCSIS 3.1 modem. Also try to get one with a 2.5Gbit Ethernet port to allow maximum speed in the future. The Arris S33 is often liked by many in various forums. There are also some cheaper ones with similar specs. Some older 3.1 modems have two 1Gb ports that can be combined with some devices, but it's not always reliable.

This is a list of all approved modems. Not all are D3. 1.

https://approvedmodemlist.com/comcast-xfinity-approved-modems/

I rebooted again and now have a blue light on both up and downstream but I can’t access to or from the internet. It seems I can only get to the modem and not beyond. Here’s the latest status page. Any thoughts on whether if this is a cable, modem or provider issue?

@user_9341c6 

The numbers are all within spec...

Have you checked the xfinity website to see if there's an outage in your area?

I’ve sent “OUT” via txt and received a no outages report and chatted w/ support. I have been experiencing short outages for months but now it’s gone entirely. ? 

@user_9341c6 

wow....

it's acting sorta like a new modem that isn't activated yet....

Might be worth running the xfinity app on your phone to see if your account has a modem associated with it.

If the app shows that modem associated with the account, maybe try a modem restart from the app.

If no modem is associated, try activating your modem from the app.

HTH

One important note is that you must reboot the modem if you change anything connected to it's Ethernet port. When it authorizes, it uses the MAC address of the connected device to authorize with Comcast and get an IP address.

It's possible if you have a router, it is not authorizing properly. Trying a computer directly, with a modem reboot, could check if the router is the problem.