Table 6. LED Indicators (Continued)
LED
Description
Color
Indication
E
Indicates the reference lock status of
the LO on the device.
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 powers status of the
device.
Off
The device is powered off.
Green
The device is powered on.
USRP-2921 Front Panel and LEDs
MIMO EXPANSION
GB ETHERNET
POWER
RX 1
TX 1
REF IN
PPS IN
A
C
E
B
D
F
NI USRP-2921
2.4 - 2.5 GHz, 4.9 - 5.85 GHz
RX 2
TX 2
6 V 3 A
Table 7. Connector Descriptions
Connector
Description
RX 1
TX 1
Input and output terminal for the RF signal. RX 1 TX 1 is an SMA (f)
connector with an impedance of 50 Ω and is a single-ended input or
output channel.
RX 2
Input terminal for the RF signal. RX 2 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 Vpk-pk) and a maximum input power of 15 dBm (3.56 Vpk-pk)
for a square wave or sine wave.
USRP-2920/2921/2922 Getting Started Guide
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© National Instruments
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17
