send/receive ports for ASUS RT-AC87U?

[erea]

I'm purchasing two directional antennae for my new ASUS RT-AC87U router, and I am wondering which of the ports are for sending and which are for receiving. Does anyone know this? I've been unable to find it anywhere else.

 

[RMerlin]

I'm purchasing two directional antennae for my new ASUS RT-AC87U router, and I am wondering which of the ports are for sending and which are for receiving. Does anyone know this? I've been unable to find it anywhere else.

They are not dedicated or pre-assigned. All four antennas can both send and receive, as the router is a four stream device.