Keysight Technologies E7515B UXM 5G, Getting Started Manual

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12 Getting Started Guide
Introduction
Overview
Figure 1-3 Overall block diagram of the RFIO board
The diagram above shows signal routing through the RFIO board (it is
simplified, omitting certain paths used for reference or calibration signals).
In the E7515E, a maximum of eight RF ports can be used at a time. All eight
can be transmit ports, provided no ports are being used as receive ports. A
maximum of four ports at a time can be used as receive ports.