@Ms90skid 

Thanks for reaching out. I understand that you have a Deco Mesh network with all units connected wirelessly, but some of your Deco units (specifically XE75 satellites) are showing Ethernet backhaul with slow speeds, and you are concerned that this setup is not improving your Sonos stability or overall mesh performance as expected.

Here are some steps and key points to help you optimize your setup:

1. Check the Ethernet Connection:
• Go to the Deco APP > MORE > Advanced > IPTV/VLAN and verify if IPTV is enabled. The IPTV port cannot be used for Ethernet backhaul.
• Try connecting the satellite Deco to a different port on the Deco or switch, or use a different Ethernet cable to rule out cable or port issues.

2. Switch and Cabling Considerations:
• If you are using a switch between Deco units, try connecting the two Decos directly with an Ethernet cable. If this resolves the issue, the switch may be causing the problem.
• Some switches, especially certain D-Link models, are not compatible with Deco's Ethernet backhaul (IEEE 1905.1 protocol). Avoid using D-Link switches for Deco Ethernet backhaul.

3. Loop Detection Features:
• When a Deco unit switches from wireless to Ethernet, there may be a brief network loop (1-2 seconds). If your switch supports loop detection, it may block the port connected to the Deco. Try turning off the loop detection function on your switch, reboot the switch, and test again. You may also want to confirm with the switch manufacturer if loop detection is enabled by default or if there is a hardware issue.

4. Additional Notes:
• Improperly connected Ethernet cables can cause severe network issues, such as network loops and broadcast storms.
• For best performance, use CAT5E (or above) Ethernet cables between Deco units, and ensure any switches used also support gigabit speeds.

If after these steps you are still experiencing slow speeds or instability, please provide more details about your network layout and the exact connections between your Deco units and Sonos devices. This will help us give you more targeted advice.

For more information, you can also refer to our community guide: https://community.tp-link.com/en/home/forum/topic/98898

Let us know if you need further assistance!