Keysight Technologies E7515B UXM 5G, Getting Started Manual

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16 Getting Started Guide
Introduction
Overview
Millimeter-Wave Accessory Instruments
For testing at higher frequencies than the UXM itself can generate, two other
instruments are commonly used with the UXM: the M1740A mmWave
Transceiver (usually called the Remote Radio Head or RRH) and the E7770A
Common Interface Unit (usually called the CIU).
Figure 1-7 UXM used with M1740A (bottom) and E7770A (top)