Annexes
R&S
®
CMW500
291User Manual 1173.9463.02 ─ 06
7.1.1.4 USB REMOTE
Universal Serial Bus connector of type B (instrument acts as device), used for remote
control of the instrument; see Remote Control Operation.
The USB connector complies with standard USB 2.0; also refer to the "Specifications".
USB Connection
The length of passive connecting USB cables should not exceed 1 m. The maximum
current per USB port is 500 mA.
7.1.1.5 USB
Double Universal Serial Bus connectors of type A (instrument acts as master), used to
connect e.g a keyboard, mouse or other pointing devices, a printer or an external storage
device (USB stick, CD-ROM drive etc.).
The USB connectors comply with standard USB 2.0; also refer to the "Specifications".
Risk of instrument damage
USB devices with external power supply must never feed back current into the 5 V power
supply of the USB interface. Before using a device with external power supply, verify that
there is no connection between the positive pole of the power supply and the +5 V power
pin of the USB interface (VBUS).
The length of passive connecting USB cables should not exceed 1 m. The maximum
current per USB port is 500 mA.
7.1.1.6 DIG IQ and AUX (I/Q Board)
An I/Q board (option R&S CMW-B510A / -B510F / -B520A / -B520F) provides four digital
connectors (labeled "DIG IQ ...", e.g. "DIG IQ OUT 4") plus two BNC connectors (labeled
"AUX ...", e.g. "AUX A").
The IQ connectors are used for input and output of digital IQ data. The bidirectional high-
impedance BNC connectors are used for input of the start source signal and input/output
of clock source signal/enable source signal. They are suited for TTL signals in a level
range from 2.5 V to 5 V.
The I/Q board is required for certain protocol test use cases and for some signaling sce-
narios (e.g. external fading, IQ out - RF in).
Interfaces and Connectors
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