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new Arris sb8200 - issues with downstream (no blue light) with gigablast

Hi There,

Wondering if you can help me, I just got an Arris SB8200 modem today and ordered Gigablast service. 

My lights are all green (no blue at all). I am in orange county, california (92630). I connect to Cox orange county server

and my download speeds range from 300-600Mbps. Upstream is consistent at 35-40Mbps.

WIFI speed is not consistent on downstream (100-250Mbps)

So I'm not getting advertised 940Mbps and the blue light (which Arris documentation states indicates high speed DOCSIS 3.1

connection is NOT ON - still green.

My older Docsis 3.0 modem and 200Mbps service didn't have this problem. Always consistent downstream for both LAN and WIFI.

Any ideas on what the problem could be?



No Data
  • Hello Steve,

    Have you accessed the Web Manager of your SB8200 to view and monitor the operational status? Please type the default LAN Ip address,, in the address bar and press Enter. You may check the Status Screen to see if there are any obvious signs there. You may email us for support at with the status screen, your complete address, and first and last name of the account holder. We will be able to look into this issue you're seeing with speed loss.

    Cox Forum Support Moderator