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 RX1 Indicates the receive status of
the module.
OFF
—
The module is not active.
Green
Solid
The module is receiving data.
RX2 Indicates the receive status of
the module.
OFF
—
The module is not receiving.
Green
Solid
The module is receiving.
Table 15. LED Indicators
Back Panel
0
1
PWR
1G/10G ETH
9-16V DC
7.5 A MAX
SFP+Ports
Connector
Use
PWR
Input that accepts a 9 V to 16 V, 6 A external DC power connector.
© National Instruments
33
USRP-2940/2942/2943/2944/2945 Getting Started