Front Panel and Connectors

NI-USRP Help

Edition Date: March 2018

Part Number: 373380J-01

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This section describes the connectors and LED indicators on the USRP-2921 device front panel.

2921 front panel
Connector Use
RX1
TX1
RF signal input and output terminal. RX1 TX1 is an SMA (f) connector with an impedance of 50 Ω and is a single-ended input or output channel.
RX2
TX2
RF signal input and output terminal. RX2 TX2 is an SMA (f) connector with an impedance of 50 Ω and is a single-ended input or output channel.
REF IN Input terminal for an external reference signal for the local oscillator (LO) on the USRP-2921. 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 Vpk-pk) and a maximum input power of 15 dBm (3.56 Vpk-pk) for a square wave or sine wave.
PPS IN Pulse per second (PPS) timing reference input terminal. 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 multiple-input, multiple-output (MIMO) EXPANSION interface port connects two 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.

The following table provides information about the USRP-2921 module front panel LEDs and the device states they indicate.

LED Indication
A Indicates the transmit status of the USRP-2921 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.
C Indicates the receive status of the USRP-2921 module:

OFF—The module is not receiving data.

GREEN—The module is receiving data.
D Indicates the firmware status of the USRP-2921 module:

OFF—The firmware is not loaded.

GREEN—The firmware is loaded.
E Indicates the reference lock status of the LO on the USRP-2921 module:

OFF—There is no reference signal or the LO is not locked to a reference signal.

BLINKING—The LO is not locked to a reference signal.

GREEN—The LO is locked to a reference signal.
F Indicates the power status of the USRP-2921 module:

OFF—The module is powered off.

GREEN—The module is powered on.

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