The N5244/45AS Option H30 provides IF Outputs on the rear panel and requires Option 020, External IF INPUTS, to verify Option H30. This enables the PNA-X to be used as a downconverter. The Option H30 IF Outputs, A, B, C/R1, D/R2 and R are the result of the RF Input signal at the PNA-X test port, or RCVR IN mixing with the internal source. The R IF Output is only available on the 4-Port N5244/45AS Option H30.