CM500 download speed with Xfinity

Question

I I recently upgraded my Internet with Xfinity to 300Mbps. After the upgrade, my connections maxes out at 110 Mbps. According to their support, the problem is on my end, and they suggested I have one of their technicians come to check things out. I don'r see what this person could do that I haven't done yet, and I suspect they want me to rent their modem. I have seen several post on similar issues with Xfinity and this modem. Could you please let me know what I need to ask from Xfinity in order to find a solution? Do I need a new modem? Thanks.

FURRYe38 · Answer

Have the ISP check the signal and line quality UP to the modem.
Be sure there are not coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.

Be sure your wire connected with a PC to the back of the modem, with out a wifi router in between to test wired speed tests.

Ensure your PC isn't running any background programs or security programs. Temporarily disable any security programs as these can slow down speed testing.

Compare speeds with other PCs connected to the modem.

aurso · Answer

Thanks for the quick respinse. I have already all but one of the suggestions. I was not able to connect to the Internet while plugged in to the back of the modem.. A comparison between several devices, both hard wired and wireless give me similar download speeds.

plemans · Answer

If you're hardwired into the modem, can you get a screen snip of your modem connections page? it'll show signal strength/quality for the modem. That helps a lot with seeing how your connection is.

Many times xfinity will charge a fee if the issue is within your house. If you're going to have a tech come out, make sure to move the modem to right where the line enters your house and remove any splitters, attenuators, amplifiers. This ensures that the wiring within your house isn't causing the issue. Plus if it fixes the issue, then it is an issue within your house or one of the items you removed.

aurso · Answer

Attached you will find the screenshot from the modem. I am using the coaxial cable provided by Xfinity without any splitters. Thanks!

plemans · Answer

That connection looks pretty good. Are you sure its the modem?&nbsp;What router are you using?How are you speedtesting? aka device, website, etc.&nbsp;Have you tried a different pc?What speeds do you get with a pc hardwired into the modem?&nbsp;Have you checked your ethernet cables?&nbsp;&nbsp;

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CM500 download speed with Xfinity

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