"При первой подаче питания и в начале эксплуатации без satellite lock, the clock displays GPS time, which does not include the UTC time compensation broadcast by GPS satellites every 12 minutes. Once UTC time compensation is received, the SEL 2407 adjusts the time, and 60 seconds later the output is accurate, UTC-based time. In Spring 2006, the UTC time compensation was 14 seconds (based on earth rotation). On initial power-up, the IRIG-B outputs are disabled until satellite lock. This prevents the SEL 2407 from sending out incorrect time to connected devices. "