Table 5. LEDs
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.
USRP-2974 Getting Started Guide
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© National Instruments
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