... unavailable or abnormal, the CC81231 is able to intelligently judge, switch to the rubidium clock, offering stable time-frequency base.CC81231 ... : ≤-100dBc 5MHz, 1MHz and 1 Road, target the same 10MHz1PPS 4, BNC, TTL level, 50Ω Time synchronization accuracy: better than ± 20ns ... levels, XS8 three core plug Airlines IRIG-B AC code 4, XS8 three core plug AirlinesSerial interface, GPS status, system ...