Table 12. LEDs (Continued)
LED Description Color State Indication
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 PPS timing
reference signal, or the
device is not locked to the
reference signal.
Green Blinking The device is locked to the
PPS timing reference signal.
GPS Indicates whether the
GPSDO is locked.
OFF — There is no GPSDO or the
GPSDO is not locked.
Green Solid 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, or
red
Solid 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 Solid The device is transmitting
data.
Green Solid The device is receiving
data.
RX2 Indicates the receive
status of the device.
OFF — The device is not receiving
data.
Green Solid The device is receiving
data.
28 | ni.com | USRP-2950/2952/2953/2954/2955 Getting Started Guide
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