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    Figure 1. NI USRP-2901 Front Panel
    Table 1. NI USRP-2901 Module Front Panel Connectors
    Connector Use
    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.
    RF 1 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.
    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.
    Table 2. NI USRP-2901 Module LEDs
    LED Description Color Indication
    RF 0 TX1 RX1 Indicates the transmit status of the device. Off The device is not active.
    Green The device is receiving data.
    Red The device is transmitting data.
    Orange The device is switching between transmitting and receiving data.
    RX2 Indicates the receive status of the device. Off The device is not active.
    Green The device is receiving data.
    RF 1 RX2 Indicates the receive status of the device. Off The device is not active.
    Green The device is receiving data.
    TX1 RX1 Indicates the transmit status of the device. Off The device is not active.
    Green The device is receiving data.
    Red The device is transmitting data.
    Orange The device is switching between transmitting and receiving data.
    Figure 2. NI USRP-2901 Module Back Panel Connectors
    Connector Use
    REF IN Input terminal for an external reference signal for the local oscillator (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.
    USB Input that accepts a standard USB cable. A suitable USB cable is included in the hardware kit.
    PPS IN Input terminal for pulse per second (PPS) timing reference. PPS IN is a female SMA connector with an impedance of 50 Ω, and it is a single-ended input channel. PPS IN accepts 0 V to 3.3 V TTL and 0 V to 5 V TTL signals.
    PWR Input that accepts a 6 V, 3 A external DC power connector.