Table 21. NI USRP-2942R Module Back Panel Connectors
Connector Use
PWR The power input accepts a 9 V to 16 V, 6 A external DC power connector.
1G/10G ETH The Ethernet ports accept 1G SFP modules and 10G SFP+ modules. With
a 1G ETH module inserted, the ports accept gigabit Ethernet-compatible
cables (Category 5, Category 5e, or Category 6).
REF OUT Output terminal for an external reference signal for the LO on the device.
REF OUT is an SMA (f) connector with an impedance of 50
Ω and is a
single-ended reference output. REF OUT outputs a 10 MHz signal at
3.3 V.
REF IN Input terminal for an external reference signal for the LO on the device.
REF IN is an SMA (f) connector with an impedance of 50 Ω and is a
single-ended reference input. REF IN accepts a 10 MHz signal with a
minimum input power of 0 dBm (.632 V
pk-pk
) and a maximum input power
of 15 dBm (3.56 V
pk-pk
) for a square wave or sine wave.
PCIe x4 This port accepts a PCI Express Generation 1, x4 bus connection through
an MXI Express four-lane cable.
PPS TRIG
OUT
Output terminal for PPS timing reference. PPS TRIG OUT is an SMA (f)
connector with an impedance of 50 Ω and is a single-ended input.
PPS TRIG OUT outputs 0 V to 3.3 V TTL. You can also use this port as a
triggered output (TRIG OUT) that you control using NI-USRP software.
PPS TRIG IN Input terminal for PPS timing reference. PPS TRIG IN is an SMA (f)
connector with an impedance of 50 Ω and is a single-ended input channel.
PPS TRIG IN accepts 0 V to 3.3 V TTL and 0 V to 5 V TTL signals. You
can also use this port as a triggered input (TRIG IN) that you control using
NI-USRP software.
GPS ANT Input terminal for the GPS antenna signal. GPS ANT is an SMA (f)
connector with a maximum input power of -15 dBm and an output of
DC 5 V to power an active antenna.
Caution Do not terminate the GPS ANT port if you do not use
it.
38
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