Pin
Description
Color
Indication
RF 0 TX1
RX1
Indicates the transmit status of
the device.
Off
The device is not active.
Red
The device is receiving data.
Green
The device is transmitting data.
RX2
Indicates the receive status of
the device.
Off
The device is not receiving data.
Green
The device is receiving data.
REF
Indicates the status of the
reference signal.
Off
There is no reference signal, or the
device is not locked to the reference
signal.
Green
Blinking—The device is not locked to
the reference signal.
Solid—The device is locked to the
reference signal.
PPS
Indicates the pulse per second
(PPS).
Off
There is no reference signal, or the
device is not locked to the reference
signal.
Green
Blinking—The device is not locked to
the reference signal.
Solid—The device is locked to the
reference signal.
GPS
Indicates whether the GPSDO
is locked.
Off
There is no GPSDO, or the device or the
GPS is not locked.
Green
The GPSDO is locked.
LINK
Indicates the status of the link
to a host computer.
Off
There is no link to a host computer.
Green/
Yellow/Re
d
The host is actively communicating
with the device.
RF 1 TX1
RX1
Indicates the transmit status of
the device.
Off
The device is not active.
Red
The device is receiving data.
Green
The device is transmitting data.
RX2
Indicates the receive status of
the device.
Off
The device is not receiving data.
© National Instruments
27
USRP-2940/2942/2943/2944/2945 Getting Started