R&S
®
CMW 500 Annexes
Interfaces and Connectors
Operating Manual 1202.3986.32 – 03 414
USB Connection
The length of passive connecting USB cables should not exceed 1 m. The maximum
current per USB port is 500 mA.
11.1.1.3 REF IN, REF OUT 1
BNC connectors used as input and output connectors for the external or internal
reference signals; see Reference Frequency Selftest.
The function of the connectors depends on the "Frequency Source" setting in the
"Reference Frequency Selftest" menu:
If the "Internal" reference frequency is active, REF OUT 1 is used as an output
connector for the 10 MHz internal reference clock signal of the R&S CMW 500.
If the "External" reference frequency is active, REF IN is used as an input
connector for an external reference clock signal. The R&S CMW 500 is
synchronized to the external reference signal. The external reference signal is also
routed to the output connector REF OUT 1.
The external reference signal must meet the specifications of the data sheet.
11.1.1.4 TRIG A, TRIG B
BNC connectors for trigger input or output signals (for future applications).
11.1.1.5 DVI (Option R&S CMW-B620A)
Optional DVI-D Dual-link connector for external monitor connection; see Connecting a
Monitor.
11.1.2 LAN Interface
To be integrated in a LAN, the instrument is equipped with a LAN interface, consisting
of a connector, a network interface card and protocols (VXI–11). For details on the
connector and its use refer to section "Rear Panel Connectors – LAN REMOTE". The
network interface card supports IEEE 802.3 for a 10 MHz Ethernet and IEEE 802.3u
for a 100 MHz Ethernet.
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