Table 5. Connector Descriptions (Continued)
Connector
Description
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.
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 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 6. LED Indicators
LED
Description
Color
Indication
A
Indicates the transmit status of the
device.
Off
The device is not transmitting data.
Green
The device is transmitting data.
B
Indicates the status of the physical
MIMO cable link.
Off
The devices are not connected
using the MIMO cable.
Green
The devices are connected using
the MIMO cable.
C
Indicates the receive status of the
device.
Off
The device is not receiving data.
Green
The device is receiving data.
D
Indicates the firmware status of the
device.
Off
The firmware is not loaded.
Green
The firmware is loaded.
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USRP-2920/2921/2922 Getting Started Guide
