I have Verizon FIOS. Use provided router Actiontec MI424WE rev1 in the middle of house. I have Airport Extreme A1408 and want to use it in another room wirelessly to connect a wired printer to print over the network. Can this be done and if so how

Can this be done

No, if you want the AirPort Extreme to connect wirelessly to the Actiontec modem/router.

Yes, if the AirPort Extreme can connect to the Actiontec modem/router using a permanent, wired Ethernet cable connection.

As Bob has mentioned this can't be done with the Extreme via a wireless connection between routers. However, the 802.11n AirPort Express base stations (either generation) could be used for this purpose, that is, they can be configured to perform as a wireless Ethernet bridge.

My FIOS router is in a closet. I would like to get an Apple Extreme Time Capsule to be the wireless router in the house. How would I do this? I know I would have to turn off the FIOS router. I want to use the higher ac speed for the wireless connection. Do I just need to connect it via an ethernet connection? Thanks.

How would I do this?

Connect an Ethernet cable from one of the LAN <--> ports on the FIOS router to the WAN "O" port on the Time Capsule, and leave it permanently connected.

Use the setup wizard on your Mac or an iPhone or iPad to set up the AirPort to create a new wireless network....a setting that the wizard will automatically suggest for you. Just follow the prompts to assign a name for the wireless network, a device name for the AirPort Extreme and setup a password that will be used for both the device and wireless network.

I know I would have to turn off the FIOS router

This is not really necessary unless you only want to to use the wireless network from the AirPort Extreme and not use the FIOS signal at all. FIOS support can tell you how to turn off the wireless on the FIOS router if you decide that you want to do that.

I want to use the higher ac speed for the wireless connection.

A few notes here.....

Using "ac" will not improve your Internet connection speed, since your Internet connection speed is determined by your Internet connection plan with FIOS. If you are looking for a faster Internet connection, then you will need to check with FIOS on the availability of a faster Internet connection plan. In other words, if your current plan with FIOS is for 50 Mbps, then the AirPort will deliver up to a 50 Mbps Internet connection, but no higher.

In order to realize the benefits of the "ac" signal from the AirPort, you will need to have a newer Mac, iPad Air or iPhone 6 that is capable of handling "ac" wireless.

"ac" signals are weaker than normal wireless signals, so best results with "ac" will be when a wireless device is in close proximity to the AirPort, or it has close to a line-of-sight relationship with the AirPort.

Having the AirPort out in the open in a good location should help improve the range of the network, and likely will improve the signal speed over your current connection, since probably 25% of the signal from the FIOS router is likely never getting out of the closet.

Bob, sorry it took me so long to respond. Thank you for the input. After I set up the wireless network with the Airport Extreme (and it is hardwired to the FIOS router) I can connect to the internet using the new network - correct? I don't have to do any other configuration changes?

After I set up the wireless network with the Airport Extreme (and it is hardwired to the FIOS router) I can connect to the internet using the new network - correct?

Yes, assuming that everything working correctly,

I don't have to do any other configuration changes?

No, assuming that everything is working correctly.

TThank you.