Table 4. Connector Descriptions (Continued)
Connector Description
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.
Note Do not terminate the GPS ANT port if you do not use it.
USRP-2952 Front Panel, Back Panel, and LEDs
Front Panel
LINK
TX OUTPUT MAX +20 dBm, RX INPUT MAX -15 dBm, ALL RF PORTS 50 Ω
TX1 RX1 RX2GPSPPSREF
TX1 RX1 RX2
JTAG
PWR
Table 5. Connector Descriptions
Pin Description
JTAG A USB port that connects the host computer to the device FPGA for
development and debugging. LabVIEW FPGA does not currently support
configuring or programming 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.
USRP-2950/2952/2953/2954/2955 Getting Started Guide | © National Instruments | 19
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