Mesh/a x b : c notation
802.11n routers can have up to four antennas and the ability to send and receive on between one and four of those at the same time.
The a x b : c notation is a way of specifying:
- a: The number of transmit antennas
- b: The number of receive antennas
- c: How many antennas can be used at the same time (number of spatial streams)
Note that a router with 1 antenna used for both receive and transmit would be 1 x 1 : 1.