Source Sync Control; Rf Input Port Mode; Half Duplex Rf Input - Keysight Technologies E6640A Getting Started Manual

XSA Interface
Switched MIMO
For 3x3 MIMO , the RFIO 1 port (a full-duplex port) captures the data stream
from the first antenna port of the DUT. The other full-duplex port, RFIO 2,
captures the data stream from the second antenna port of the DUT. One of the
half-duplex ports, RF3 I|O or RF4 I|O, captures the data stream from the third
antenna port of the DUT.
Figure 3-25 3X3 switched MIMO connections

Source Sync Control

Switched MIMO is a measurement process only; it is not necessary to use
Source Sync Control (required for true MIMO) in the case of switched MIMO.

RF Input Port Mode

The RF Input Port Mode must be set to List, so that the sequence can change
the input port path from one acquisition to the next. In the Meas Setup > RF
Input Port Mode menu, select List. The equivalent SCPI commands is:
[:SENSe]:LSEQuencer:PORT:INPut:MODE LIST

Half Duplex RF Input

In the case of 3x3 switched MIMO, one of the half-duplex ports (RF3 I|O or RF4
I|O) must be designated as an RF input port for the third input. In the
Input/Output > RF Output & Test Set Config > Hal f Duplex Config > RF Input
menu, select RFIO3 or RFIO4, so that the RF3 IO port or the RF4 I|O port is
defined as the input port. The equivalent SCPI command is:
[:SENSe]:HDUPlex:PORT:INPut RFIO3|RFIO4
Getting Started Guide 83