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    Figure 1. NI USRP-2940R Front Panel
    Table 1. NI USRP-2940R Module Front Panel Connectors
    Connector Use
    JTAG A USB port that connects the host computer to the device FPGA for development and debugging. You cannot currently configure or program the device FPGA using the JTAG connector.
    RF 0 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.
    AUX I/O General-purpose I/O (GPIO) port. AUX I/O is controlled by the FPGA.
    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.
    Note  

    The LED indications described in the following table occur only when you use the NI-USRP nodes with the default FPGA image. When you use the USRP-RIO nodes, you customize the LED indications.

    Table 2. NI USRP-2940R Module LEDs
    LED Description Color State Indication
    RF 0 TX1 RX1 Indicates the transmit status of the module. OFF The module is not active.
    Red Solid The module is transmitting data.
    Green Solid The module is receiving data.
    RX2 Indicates the receive status of the module. OFF The module is not receiving.
    Green Solid The module is receiving.
    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 PPS timing reference signal, or the device is not locked to the reference signal.
    Green Blinking The device is not locked to the PPS timing reference signal.
    Solid The device is locked to the PPS timing reference signal.
    GPS Indicates whether the GPSDO is locked. OFF There is no GPSDO or the GPSDO is not locked.
    Green Solid The GPSDO is locked.
    LINK Indicates the status of the link to a host computer. OFF There is no link to a host computer.
    Green, yellow, or red Solid The host is actively communicating with the device.
    RF 1 TX1 RX1 Indicates the transmit status of the module. OFF The module is not active.
    Red Solid The module is transmitting data.
    Green Solid The module is receiving data.
    RX2 Indicates the receive status of the module. OFF The module is not receiving.
    Green Solid The module is receiving.
    Figure 2. NI USRP-2940R Module Back Panel
    Table 3. NI USRP-2940R Module Back Panel Connectors
    Connector Use
    PWR Input that accepts a 9 V to 16 V, 6 A external DC power connector.
    1G/10G ETH Ethernet port that accepts 1G SFP modules and 10G SFP+ modules. With a 1G ETH module inserted, the ports accept gigabit Ethernet-compatible cables (Category 5, Category 5e, or Category 6).
    REF OUT Output terminal for an external reference signal for the LO on the device. REF OUT is a female SMA connector with an impedance of 50 Ω, and it is a single-ended reference output. The output signal at this connector is 10 MHz at 3.3 V.
    REF IN Input terminal for an external reference signal for the LO on the device. REF IN is a female SMA connector with an impedance of 50 Ω, and it is a single-ended reference input. REF IN accepts a 10 MHz signal with a minimum input power of 0 dBm (0.632 Vpk-pk) and a maximum input power of 15 dBm (3.56 Vpk-pk) for a square wave or sine wave.
    PCIe x4 Port for a PCI Express Generation 1, x4 bus connection through an MXI Express four-lane cable.
    PPS TRIG OUT Output terminal for the pulse per second (PPS) timing reference. PPS TRIG OUT is a female SMA connector with an impedance of 50 Ω, and it is a single-ended input. The output signal is 0 V to 3.3 V TTL. You can also use this port as triggered output (TRIG OUT) that you program with the PPS Trig Out I/O signal.
    PPS TRIG IN Input terminal for pulse per second (PPS) timing reference. PPS TRIG IN is a female SMA connector with an impedance of 50 Ω, and it is a single-ended input channel. PPS TRIG IN accepts 0 V to 3.3 V TTL and 0 V to 5 V TTL signals. You can also use this port as a triggered input (TRIG IN) that you control using NI-USRP software.
    GPS ANT Input terminal for the GPS antenna signal. GPS ANT is a female SMA connector with a maximum input power of -15 dBm and an output of DC 5 V to power an active antenna.
    Caution  

    Do not terminate the GPS ANT port if you do not use it.