How to enable 5GHz mode in Time Capsule

How to enable 5 GHz mode....

Both 2.4 GHz and 5 Ghz bands are always enabled. You cannot turn one "off" and another "on".

Both 2.4 GHz and 5 GHz bands are broadcast using the same wireless network name when the Time Capsule is using default settings.

This is the best choice for most users, since wireless devices will automatically connect to either the 2.4 GHz or 5 GHz signal based on their capability and location in relation to the Time Capsule.

For example, iPhones cannot connect to a 5 GHz network, so they will always connect at 2.4 GHz.

A newer Mac laptop will connect at 5 GHz if it is in close proximity to the wireless router, but it will switch to 2.4 GHz once it moves several rooms away....because 2.4 GHz signals are stronger than 5 GHz signals.

You do have the option to assign a separate name to the 5 GHz network. If you do this, you can "point" wireless devices to that specific network to connect. But....this is no guarantee that that they will be connecting to the best signal.

Once the laptop is a few rooms away, the 2.4 GHz signal might well be not only stronger...but also faster. If the laptop is "locked" onto the 5 GHz signal, it does not transfer data as quickly as it could using 2.4 GHz when it is not close to the router.

The bottom line for most users would be to leave the settings in default mode and let devices automatically choose and connect to the best signal quality. Isn't that what you want?

Thank you Bob, a very clear answer that has helped me solve the same question as alexsander

The answer is a bit out of date now, as the newer iPhones are 5 GHz capable.

And, indeed, the iPod touch 5th generation, and some Android devices as well (unfortunately not the Nexus 7).