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user_xyn5wx
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10/24/2026 5:13 PM

DOCSIS 4.0 Full Duplex (FDX) Service

I need an address-level DOCSIS 4.0 Full Duplex (FDX) serviceability verification, not a general internet speed troubleshooting response.

My Xfinity account advertises 1 Gbps download and 1 Gbps upload. I recently replaced my XB7 with an XB10 DOCSIS 4.0 gateway, but both gateways deliver approximately 950 Mbps download and only 100 Mbps upload.

I understand from Xfinity Community Forum discussions that there is specific address-level coding that identifies whether DOCSIS 4.0 FDX is actually enabled at a service address.

Could your team please:

  1. Check the address-level FDX/X-Class eligibility and serviceability codes for my exact address.

  2. Confirm whether my neighborhood's cable node has been upgraded and activated for DOCSIS 4.0 Full Duplex.

  3. Verify whether my XB10 is assigned a 1000/100 or 1000/1000 provisioning profile.

  4. Determine whether there is a discrepancy between my advertised 1 Gig symmetrical plan and the actual network capabilities at my location.

If the network is not DOCSIS 4.0 ready, please confirm that explicitly and let me know whether an upgrade notification is available.

Please escalate to the appropriate network provisioning or engineering team if necessary.

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16 hours ago

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EG

Expert

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122.4K Messages

21 hours ago

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

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XfinityShawn

Official Employee

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2.8K Messages

19 hours ago

 

plabrie61 My team is happy to help! Can you please confirm your plan speeds from the Xfinity app or online? I just want to make sure that your plan says for 1Gb download as well as upload since that is the main concern. Could you also try this link https://www.xfinity.com/support/articles/my-account-find-contract as it should show your plan details as well. 

 

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user_xyn5wx

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3 Messages

16 hours ago

Speedtest at the gateway shows ~930Mbps down and ~125Mbps up.

I used the link provided and my plan shows 1G down / 1G up.

Thank you for your help.

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XfinityMarcus

Official Employee

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2.5K Messages

user_xyn5wx We can definitely check to see if your account is in an area where this level of service is available. 

Please send us a direct message with your full name and complete service address to “Xfinity Support”. To do so, click on the direct messaging icon located at the top right of this forums page.

 

Here's the detailed steps to direct message us:

How to Send Us a Direct Message:

  1. Click "Sign In" if necessary.
  2. Click the "Direct Messaging" icon.
  3. Click the "Start new conversation" (pencil and paper) icon.
  4. In the "To:" line, type "Xfinity Support".
  5. As you type, a drop-down list will appear. Select "Xfinity Support" from that list.
  6. An "Xfinity Support" graphic will replace the "To:" line.
  7. Type your message in the text area near the bottom of the window.
  8. Press Enter to send it.

(edited)

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16 hours ago

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user_xyn5wx

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3 Messages

16 hours ago

Screen shot of my plan.

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