Apple AirPort Extreme Base Station A1521 (ME918LL/A)


 * Teardown on iFixit
 * switches to new tower style design
 * BCM53019 SoC (appears to be a BCM53019A1 [BCM53019A1KFEBG])
 * indicates usage of BCM4360 (BCM4360KLMG) radios for both bands (...)
 * Skyworks SE5003L1 (5003L1) 5GHz WLAN power amplifier ICs for the 5GHz radio
 * Skyworks SE2623L (2623L) 2.4GHz WLAN power amplifier ICs for the 2.4GHz radio
 * "820-3646-03" is silkscreened on the board.
 * Panasonic BR2330 battery


 * Product page in the Apple store
 * Specifications per the store follow...
 * Dimensions 168 mm (height) x 98 mm (width) x 98 mm (depth)
 * Weight: Weight::945 g (Weight::2.08 lbs)
 * Number of users: 50


 * Apple's New AirPort Extreme Offers No Innovation on SmallNetBuilder

The FCC test report indicates the firmware used during testing was 6.10.56.166.
 * Transmit beam forming is supported on 802.11n/ac