Table 13. Connector Descriptions (Continued)
Connector Use
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.
Notice Do not terminate the GPS ANT port if you do not use
it.
USRP-2955 Front Panel, Back Panel, and LEDs
Front Panel
Table 14. Connector Descriptions
Connector Use
JTAG A USB port that connects the host computer to the device FPGA for recovery
purposes. This port can be used with the Xilinx iMPACT configuration tool to
temporarily load a new bitfile.
RF 0 RX1 Input terminal for the RF signal. RX1 is an SMA (f) connector with an
impedance of 50 Ω and is a single-ended input 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.
30 | ni.com | USRP-2950/2952/2953/2954/2955 Getting Started Guide
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