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Tuesday, March 4th, 2025 1:18 AM

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Just upgraded to an Arris S34, but still only getting 40 Mbps upload speed

I recently upgraded to the 2gbps/400mbps plan that became available in my area but was still getting slow upload speeds, so I just upgraded to the Arris S34 cable modem after seeing it on a list showing that it supports the next gen upload speeds.

My speed tests directly from my Ubiquiti Dream Machine Pro, wired from a 1/2.5/10GB SFP+ over Cat 6A ethernet, shows download speeds around 2.33 Gbps, but my upload speeds are still only hitting 40 Mbps. Is there something on the back end that needs to be configured for it to upload properly?

Official Solution

Official Employee

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875 Messages

10 days ago

@Bmp740 Thank you for connecting with us and allowing us the opportunity to correct your speed issue. I am glad the issue was a quick fix after getting your S33 modem updated to the newly registered S34 modem you added recently for you to start seeing the faster upload speeds. Don't hesitate to visit our forums or create a new post in the future if you need assistance again.  

Expert

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109.1K Messages

14 days ago

Concern moved here to the Customer Service help section for greater exposure to Comcast corporate employees (The Digital Care Team) for assistance.

Official Employee

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2K Messages

14 days ago

 

Bmp740 Thanks for reaching out with your upload speed concern. I would be happy to review the account to assist in any way I can. 

Can you send us a direct message with your full name, name of account holder (if different), and service address please?

To send a "Direct Message" to Xfinity Support:

Click "Sign In" if necessary

Click the "Direct Messaging" icon (speech bubble)

Click the "New message" (pencil and paper) icon

The "To:" line prompts you to "Type the name of a person". Instead, type "Xfinity Support" there

As you are typing a drop-down list appears. Select "Xfinity Support" from that list

An "Xfinity Support" graphic replaces the "To:" line

Type your message in the text area near the bottom of the window

Press Enter to send it

 

Expert

 • 

109.1K Messages

10 days ago

Solved topic now being closed.

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