Can I connect my Airport Extreme Time Capsule via ethernet to another router (non-Apple)?

Question

I've been trying to figure this out for a few hours and have gotten nowhere. I have an Archer C7 AC1750 router set up in my office, connected to my Zoom 5341 DOCSIS 3.0 Modem; this has been my main router and has worked fine. I have moved some things around and now have my PS3 and PS4 in my master bedroom but can no longer hook them up via ethernet to the Archer C7. I have run ethernet through the attic into the master bedroom and want to use my Airport Extreme Time Capsule as a way to hook up the consoles via ethernet. If I can use the Airport Extreme to extend my wireless network back to the bedrooms that is even better, although that is an afterthought.
I am not sure what the settings need to be to make this happen. I have searched and tried a number of things but have not found a working solution.
Any help would be greatly appreciated.

Answer 1

Please start over with a default reset on the Time Capsule. This will not affect any of the stored data that you might have on the drive. You can use the same device name and password that you used before if you wish.
Power up the Time Capsule for a few minutes. Then hold in the reset button firmly for 10 seconds and release. Allow a full minute for the Time Capsule to restart to a slow, blinking amber light.
Make sure that the Ethernet cable connection from the Archer router connects to the WAN "O" port on the Time Capsule
Open up AirPort Utility
Click on Other WiFi Devices
Click on Time Capsule xxxxxx
AirPort Utility will suggest a setup, which you want to ignore
Instead, click the Other Options button
Select the Create a new wireless network setting and click Next
In the Network Name box, enter the exact name of your Archer wireless network
In the Base Station name box, enter a name that you want to use for the Time Capsule device
Uncheck the box to use a single password
In the Network Password box, enter the password for the Archer wireless network
Verify on the next line
In the Base Staion box, enter a password that you want to use as a device password for the Time Capsule
Verify on the next line
Click Next and wait while the AirPort Utility creates a network
Ignore the step about unplugging the modem and click Next
Do not enable the Guest Network option and click Next
Wait while the network is being set up. When you see the message that the wireless network is available, click Done
The Time Capsule will now appear in AirPort Utility with a blinking amber light
Click on the Time Capsule icon, and then click on Edit in the next small box that appears
Click the Network tab at the top of the window
Change the setting for Router Mode from DHCP and NAT to "Off (Bridge Mode)"
Click Update at the lower right and click Continue
Wait a full minute for the Time Capsule to restart and you should have a green light
It would be an excellent idea to power off both the Time Capsule and Archer router now, wait a minute, then start the Archer router and let it run a minute. Then, start the Time Capsule up and give it a minute
You should be all set. The Ethernet ports on the Time Capsule are now operable and the wireless network has been extended using AES encryption.