The RF inputs are ports 1 and 3. The RFouputs are ports 2 and 4.

For CHA: VINA- is port1, VINA+ is port3, VOUTA- is port2, VOUTA+ is port4.

For CHB: VINB- is port1, VINB+ is port3, VOUTB- is port2, VOUTB+ is port4.