[tapanjk]

> When powering up an AP that uses a DFS channel, you will see that the 2.4GHz radio becomes available as soon as the AP has completed its boot sequence, but the 5Ghz radio may not available for another minute. This is due to the AP performing its channel availability check, if the AP is trying to use a DFS-impacted 5GHz channel.

This always baffled me. Mystery solved!

[smcleod]

Oh my gosh - that's why! I always assumed that the 5Ghz radios were slower to boot their FW or something.