Why is the Ubiquiti Rocket M5AC and PBE-5AC-500 claimed to have a transfer rate of up to 450Mbps, while the ac standard with MIMO 2x2 is limited to 867Mbps?

Question

WiFi

At least about 450Mbps. all online stores write (the model is still very raw, it is only expected in the CIS, so there is almost no real information), but in the datasheet ( dl.ubnt.com/datasheets/RocketAC/Rocket5ac_DS.pdf ) nothing specific is said, more precisely they write: The throughput for TDMA AirMax ac is 450Mbps, which is three times more than the regular AirMax.

At the same time, there is no confusion with information on Mikrotik NetBox5 ac:
- "Peak data transfer rate, due to MIMO 2x2 and 802.11ac (backwards compatible with all early 5GHz protocols), reaches 866Mbit / s;"
Actually, what's the catch?
I still hope to get to the bottom of the truth.

Answer 1

percent apparently can not digest more. decided to release a passing model. so that there was something to release further). over there at the t-link in general gig seven hundred. and nothing)

Answer 2

The real keyword and + after 450, i.e. 450 or more real megabits, it will squeeze out in the appropriate conditions, 866 (like 300 for the previous standard) is a channel and not a real speed. Also 866 is a "short guard interval" which is not recommended for outdoor use, with a long interval it will be 780 megabits. Next, we look at what FEC is there for the most aggressive modulation, it turns out that 5/6, which means we throw out 1/6 of the speed, there are about 722 (650) megabits + various overhead costs of Wi-Fi itself, so 450+ real megabits remain.