Table 6. NI USRP-2920 Module Front Panel Connectors
Connector Use
RX1
TX1
Input and output terminal for the RF signal. RX1 TX1 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.
REF IN Input terminal for an external reference signal for the local oscillator
(LO) on the device. REF IN is an SMA (f) connector with an
impedance of 50 Ω and is a single-ended reference input. REF IN
accepts a 10 MHz signal with a minimum input power of 0 dBm
(.632 V
pk-pk
) and a maximum input power of 15 dBm (3.56 V
pk-pk
) for
a square wave or sine wave.
PPS IN Input terminal for the pulse per second (PPS) timing reference.
PPS IN is an SMA (f) connector with an impedance of 50 Ω and is a
single-ended input. PPS IN accepts 0 V to 3.3 V TTL and 0 V to 5 V
TTL signals.
MIMO
EXPANSION
The MIMO EXPANSION interface port connects two NI USRP
devices using a compatible MIMO cable.
GB ETHERNET The gigabit Ethernet port accepts an RJ-45 connector and gigabit
Ethernet compatible cable (Category 5, Category 5e, or Category 6).
POWER The power input accepts a 6 V, 3 A external DC power connector.
Table 7. NI USRP-2920 Module LEDs
LED Indication
A Indicates the transmit status of the module:
OFF—The module is not transmitting data.
GREEN—The module is transmitting data.
B Indicates the status of the physical MIMO cable link:
OFF—The modules are not connected using the MIMO cable.
GREEN—The modules are connected using the MIMO cable.
NI USRP-29xx Getting Started Guide
| © National Instruments | 23
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