Table 7. Connector Descriptions (Continued)
Connector Description
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 V
pk-pk
) and a maximum input
power of 15 dBm (3.56 V
pk-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 an SMA (f)
connector with a maximum input power of -15 dBm and an output of DC
5 V to power an active antenna.
Notice Do not terminate the GPS ANT port if you do not use
it.
22 | ni.com | USRP-2950/2952/2953/2954/2955 Getting Started Guide
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