Xirrus XR Series User Manual

Wireless Access Point
46 Installing the Wireless AP
one is directed to a mobile phone. When a transmission is complete, the antennas
are reallocated.
Figure 20. MU-MIMO with Four Antennas
The table below illustrates how data streams might be allocated to multiple users
on an 802.11ac transmitter with multiple antennas.
# of AP Antennas Possible Combinations of Receiver Antennas
2 1 station w/ 2 antennas -or- 
2 stations w/ 1 antenna
3 1 station w/ 3 antennas -or-
1 station w/ 2 antennas + 1 station w/ 1 antenna -or-
3 stations w/ 1 antenna
4 1 station w/4 antennas -or- 
2 stations w/2 antennas -or-
1 station w/2 antennas + 2 stations w/1 antenna -or- 
4 stations w/ 1 antenna
8 1 station w/ 8 antennas -or- 
2 stations w/ 4 antennas -or-
1 station w/ 4 antennas + 2 stations w/ 2 antennas -or-
2 stations w/ 2 antennas + 4 stations w/1 antenna -or-
… many other combinations …
Spatial Streams
Rx 1
Rx 1
Rx 3
Data Stream
Data Stream
Data Stream
Tx 1
Tx 3
Rx 2Tx 2
Tx 4
Transmitter
(Access
Point)

Xirrus XR Series Specifications

General

Brand	Xirrus
Model	XR Series
Category	Wireless Access Point
Language	English