Sorry, but we do not know what you mean by "link".
Would this be a wireless "link", or a wired Ethernet "link"?
What do you want the AirPort Express to do when it is "linked"?
What is the model number of the AirPort Extreme? Look on the bottom of the device if you do not know.
If you want detailed help, we need to know what operating system you will be using on the computer that will be used to configure the AirPort Express.
Hello Bob -
I have an Apple Extreme (5th Gen) and I have tried to extend my network with an Apple Express Model No. A1264 with the ethernet connection. It does not seem to work, and has crashed my network twice. When I did get it to work, the wireless crawled. When I took the AirPort Express off of the network the speed went back up.
Can this be done to extend the network, as I have the Extreme in the basement where the cable comes into the house, and I have two other floors that need wireless access. Any suggestions for this older model AirPort Express?