Table 16. Connector Descriptions (Continued)
Connector Use
REF IN Input terminal for an external reference signal for the LO on the device.
REF IN is a female SMA connector with an impedance of 50 Ω, and it is a
single-ended reference input. REF IN accepts a 10 MHz signal with a
minimum input power of 0 dBm (0.632 V
pk-pk
) and a maximum input
power of 15 dBm (3.56 V
pk-pk
) for a square wave or sine wave.
LO IN 0 IF2 Terminal for an external signal to the IF LO input on the RF 0
daughterboard. This signal can be used as the LO source for an RF 0
channel by selecting external on that channel's LO source setting.
LO IN 0 IF2 is a female SMA connector with an impedance of 50 Ω.
LO IN 0 IF1 Terminal for an external signal to the IF LO input on the RF 0
daughterboard. This signal can be used as the LO source for an RF 0
channel by selecting external on that channel's LO source setting.
LO IN 0 IF1 is a female SMA connector with an impedance of 50 Ω.
PCIe x4 Port for a PCI Express Generation 1, x4 bus connection through an MXI
Express four-lane cable.
LO IN 1 IF2 Terminal for an external signal to the IF LO input on the RF 0
daughterboard. This signal can be used as the LO source for an RF 0
channel by selecting external on that channel's LO source setting.
LO IN 1 IF2 is a female SMA connector with an impedance of 50 Ω.
LO IN 1 IF1 Terminal for an external signal to the IF LO input on the RF 0
daughterboard. This signal can be used as the LO source for an RF 0
channel by selecting external on that channel's LO source setting.
LO IN 1 IF1 is a female SMA connector with an impedance of 50 Ω.
PPS TRIG OUT Output terminal for the pulse per second (PPS) timing reference.
PPS TRIG OUT is a female SMA connector with an impedance of 50 Ω,
and it is a single-ended input. The output signal is 0 V to 3.3 V TTL. You
can also use this port as triggered output (TRIG OUT) that you program
with the PPS Trig Out I/O signal.
USRP-2950/2952/2953/2954/2955 Getting Started Guide | © National Instruments | 33
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