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Modem upgrade causes slower speeds

New Poster

Modem upgrade causes slower speeds


I switched from a surfboard sb6141 to an arris t25 modem. I just upped my speeds to 600mbps down and the sb6141 maxes out at 300. Before the switch I was getting 270mbps down no problem. After the switch to the T25 I max out at around 100mbps and I should be getting closer to 600. Any recommendations?
New Poster

Re: Modem upgrade causes slower speeds

I also bought an Arris t25 last week and signed up for 1Gb access. It does not work. I then asked them to send me one of Xfinity modems, which I installed and I am using now and the same thing, the speed is close to 300Mbps.


I tried the suggestion of going to 600Mbps that is floating in the forums. I signed up for that and the speed is still 300Mbps.


The tech came by on Monday and checked to line to the edge of my house. He said all is well.


Spent hours on the phone a no one could fix the problem, even on their modem.


I am scheduled for some super-tech call on Friday, but I am losing hope.


I spoke to Arris, and showed them the QAM readout and they noticed that I was missing QAM 32. The display was always up to QAM 31.