By Glenn Fleishman

Rich Knudson wants to know why his 802.11ac-bearing iMac from late 2015 isn’t giving him the performance he expects when connected to a new Time Capsule, which also has 802.11ac Wi-Fi networking. He compared AirPort Utility numbers to OS X’s hidden display, and writes:

The data rate/Tx

[transmit] Rate and RSSI [received signal strength] are very different between Airport Utility and the extended Wi-Fi data you get when you option click the Wi-Fi icon in the top right menu bar.

One of the benefits I was expecting with my new setup was to connect my iMac to the network using wireless-ac and see a step function improvement in data rate/Tx Rate speeds.

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Read more here:: Why your base station and OS X might report different Wi-Fi rates