status = referenceLockedStatus(radio)
returns the lock status of the specified USRP™ radio radio to the 10 MHz clock reference clock of the
GPS disciplined oscillator (GPSDO) or a 10 MHz external clock source.
Support for NI™
USRP N3xx and X3xx series radio devices has moved from Communications Toolbox™ Support Package for USRP Radio to Wireless Testbench™ Support Package for NI
USRP Radios.