Table 33. NI USRP-2953R Module Back Panel Connectors (Continued)
Connector Use
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.
52
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