Table 5. Connector Descriptions (Continued)
Pin Description
RF 1 TX1 RX1 Input and output terminal for the RF signal. TX1 RX1 is an SMA (f)
connector with an impedance of 50 Ω and is a single-ended input or output
channel.
RX2 Input terminal for the RF signal. RX2 is an SMA (f) connector with an
impedance of 50 Ω and is a single-ended input channel.
The LED indications described in the following table occur only when you use the NI-USRP
API with the default FPGA image. When you use LabVIEW FPGA, you customize the LED
indications.
Table 6. LED Descriptions
Pin Description Color Indication
RF 0 TX1
RX1
Indicates the transmit
status of the device.
Off The device is not active.
Red The device is receiving data.
Green The device is transmitting data.
RX2 Indicates the receive status
of the device.
Off The device is not receiving data.
Green The device is receiving data.
REF Indicates the status of the
reference signal.
Off There is no reference signal, or
the device is not locked to the
reference signal.
Green Blinking—The device is not
locked to the reference signal.
Solid—The device is locked to
the reference signal.
PPS Indicates the pulse per
second (PPS).
Off There is no reference signal, or
the device is not locked to the
reference signal.
Green Blinking—The device is not
locked to the reference signal.
Solid—The device is locked to
the reference signal.
20 | ni.com | USRP-2950/2952/2953/2954/2955 Getting Started Guide
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