blwilson87's profile

blwilson87

New Contributor II

 • 

5 Messages

Closed

Not receiving DOCSIS 3.1

Up until last week my ARRIS SB8200 was receiving DOCSIS 3.1, indicated by the blue lights on the front of the modem. Directly wired in I was pulling 900-940 mbps down. Those lights are now lit green, representing DOCSIS 3.0, and I’m now limited to 500-550 mbps. I’ve tried numerous resets and even bought a second SB8200 to test, same issue  

I have had no changes to the coax line and I am not using a splitter. Looking for suggestions, hoping to avoid the $75 charge to have someone out to my home if at all possible. 

Discussions

 • 

Updated 

2.1K

3

0

0

W

WiderMouthOpen

+6 more

Esteemed Contributor III

 • 

3.5K Messages

My guess would be noise on the OFDM channel. Can you post the signal levels from 192.168.100.1? See here on how.

2

0

B
blwilson87

New Contributor II

 • 

5 Messages

Sure! Signal levels attached:

https://ibb.co/C7gHwvd

Like

Reply

B
Becky

+2 more

Moderator

 • 

4.3K Messages

Hi Blwilson87, I agree with WiderMouthOpen in regards to your signal levels and channel bonding. If you aren't able to improve your metrics, a service call may be needed. I want to increase your speeds so you can enjoy your internet! Please email us at cox.help@cox.com if we can be of further assistance. -Becky, Cox Support Forums Moderator

Like

Reply

0

W

WiderMouthOpen

+6 more

Esteemed Contributor III

 • 

3.5K Messages

hoping to avoid the $75 charge to have someone out to my home if at all possible. 

BTW, the charge is only if the issue is inside the home. If you have tried a new modem and have a direct connection from the demarc. then there is very low chance that the issue is chargeable. 

0

D

Darkatt

+2 more

Honored Contributor

 • 

2.1K Messages

If you are only connecting 3.0, and not 3.1, it's indicative of either noise on the ofdm channel, like WMO suggested, or bad levels. Try replacing any splitters and barrel connections, and the cable cord from the modem to the barrel connecter. 

7

B
blwilson87

New Contributor II

 • 

5 Messages

Right now, the coaxial is running 50 ft from the wall, directly to the modem. Currently no splitters or barrels between. I can definitely try a new coaxial and could change out the wall plate. I posted my signal levels, but not entirely sure what I am looking at there.

Like

Reply

0

W
WiderMouthOpen

+6 more

Esteemed Contributor III

 • 

3.5K Messages

Right now your signal levels are really bad. You are not locking half your channels, and the OFDM has no SNR lock. Also you upstream is too high. Should be below 50dB. Can you connect direct to the wall (minus the 50') and post what your signal levels are then?

Like

Reply

B
blwilson87

New Contributor II

 • 

5 Messages

Hey Wider, here are my numbers with the modem connected directly to the coax line inside the wall.

https://ibb.co/5FKfk3y

Like

Reply

0

D
Darkatt

+2 more

Honored Contributor

 • 

2.1K Messages

Try swapping the barrel connected at the wall plate, if no changes take place, then a service technician call is in order. 

Like

Reply

0

B
blwilson87

New Contributor II

 • 

5 Messages

Hey Darkatt, I swapped that barrel connector last night with no change. Posted some new numbers above with the modem wired directly to the coax line, inside the wall, without the wall plate / barrel connector in-between.

Looking like I will have to get a tech out. Appreciate all of the knowledge from you and Wider.

Like

Reply

0