The optional GPS receiver provides an extremely stable and robust method for accurately locking multiple SPGs and also for governing the unit s LTC, VITC and NTP outputs, while the SNMP agent permits remote status monitoring of critical functions. Accurate GPS referencing is managed by the internal receiver module, or by locking to an external source of 1pps and NMEA serial data, guaranteeing the synchronization of all video, audio, PC-based devices and system clocks.