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Howdy everyone! Just replaced my providers Arris with this G34 (SBG00DAY34). I currently have Optimum service formally known as (suddenlink). I pay for the 500 Mbps Service, and with their modem everything was perfect! I always had at least no lower than a 450 Mbps download speed, I would even see 600 sometimes on wired connections. 

Now on this G34 all of my ethernet ports show a -200 dBm. I have three ethernet cords plugged in. They go to my TV, Xbox series X and desktop. The dBm levels on the WiFi are normal and the connection is perfect on both 5GHz and 2.4GHz. But again, the speeds are hardly acceptable. If I wasn’t paying for speeds I wasn't receiving I wouldn't mind. Everything seems to work okay which is strange to me, and the ping is low. 
 

I can't figure out for the life of me what is causing the issue with the ethernet ports. If anyone can give me any sort of direction, I would greatly appreciate it. when it comes to technology and figuring things out, but I'm not very well versed in the networking side of things!

 

Thank you for your time!!!

In this case we would suggest you to try setting the speed of the ethernet port. Log in to the modem's GUI and check the following to configure the ethernet port speed. After making the adjustments, test the speed of each port. Additionally, try using different ethernet cables to see if that affects the speed. 
Once you logged in to the GUI go to 
Gateway > Hardware > Ethernet
Select connection speed option- click on the drop down arrow and select the speed, then click on Save
 


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