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drakkan
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6 Messages

Friday, January 10th, 2025 1:32 AM

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

I recently upgraded to the 2gbps/300mbps 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 (here).

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?

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17 hours ago

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Accepted Solution

drakkan

6 Messages

5 days ago

My new modem was added but wasn't marked as the Active modem, so it was still limiting the upload speed to 40mbps. Support was able to fix it by setting it to the active one and restarting the modem.

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XfinityLinda

Official Employee

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1.5K Messages

@drakkan Thank you for sharing the resolution here with our community. Have a nice rest of your day!

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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5 days ago

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XfinityFrank

Official Employee

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1.1K Messages

7 days ago

Hi there, @drakkan! Thanks for reaching out to us here on the Community Forum! Would you be able to try a test directly from the S34 to a desktop/laptop, without the additional networking equipment to see what speeds you get? Reason being, if you're getting the correct download speed then it is likely we are already configured with the correct bootfile. The true test of speed is going to be a direct connect via ethernet to one laptop/desktop. Let us know the result when you get a chance to try that. Thanks! 

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drakkan

6 Messages

Why would that help if I'm already testing from a device directly connected to the modem? It's a very expensive enterprise network appliance that will outperform any of my computers in network performance. It has two 10Gbps ports on it, one of those is connected directly to the modem.

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7 days ago

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XfinityAirelle

Official Employee

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2.2K Messages

Thanks for the clarification! Since you're already testing with a high-performance enterprise-grade device directly connected to the modem via a 10Gbps port, we can rule out local equipment limitations.

To move forward, we’ll want to check a few things:

  • Confirm the modem’s bootfile is properly provisioned for your speed tier.
  • Verify signal levels and ensure there are no issues with the line quality.
  • Run diagnostics on our end to identify any possible provisioning concerns.

Our awesome digital care team would be happy to assist you. Can you initiate a direct message and start with your full name and address? To start a direct message, you must be signed in. Please click the "Direct Messaging" icon in the top right of the page next to the bell, and send your message to "Xfinity Support". Talk to you there!

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

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7 days ago

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AyatoKahmina

Visitor

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2 Messages

What values should these be set to for optimal performance?

  • Confirm the modem’s bootfile is properly provisioned for your speed tier.
  • Verify signal levels and ensure there are no issues with the line quality.

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17 hours ago

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AyatoKahmina

Visitor

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2 Messages

17 hours ago

Same question.  I just upgraded to the Arris Surfboard S34, based on the recommended list provided on XFINITY's website (https://assets.xfinity.com/assets/dotcom/projects/cix-4997_compatible-devices/2024.09.18%20Full%20List%20of%20Compatible%20Devices.pdf)

I am limited to 40mbps upload speeds.  I am using a CAT 6 cable directly from the S34 to my laptop.  Download speeds as expected for my 2gpbs tier.  But upload speeds are nowhere near where I am paying for.

What do I need to change or do to achieve those upload speeds?

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