... communication base station, PHS base stations, GSM network optimization system provides high-precision time and frequency synchronization signal.CC81131 uses ... availability.The average frequency accuracy better than 1E-12 (continuous tracking GPS signals 24 hours later); meet the ITU ... source Opt N: SNTP protocol, MIB II Optional power supply: AC220V, DC48V, 24V, 12V Antenna cable extension CC81131: ...