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Modules
The Atom GPS timing system includes two types of modules: Atom GPS modules and clock/time processing modules on routers.
Related Modules
Figure 16-1 GPS timing
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Atom GPS timing involves two modules: Atom GPS timing module an clock/time processing module on the router.
Atom GPS Modules
- GPS antenna: receives signals from GPS satellites.
- GPS receiver: processes GPS RF signals and obtains frequency and time information from the GPS RF signals.
Phase-locked loop (PLL):
Frequency PLL: locks the 1PPS reference clocks and outputs a high-frequency clock.
- Analog PLL (APLL): multiplies the system clock to a higher frequency clock.
- Time PLL: locks the UTC time and outputs the system time.
- Real-time clock (RTC): provides real-time timestamps for PTP event messages.
- PTP grandmaster (GM): functions as the SyncE slave to obtain SyncE clock data.
Clock/Time Processing Modules on routers
An Atom GPS module must work in conjunction with clock/time
processing modules to implement clock and time synchronization. routers support two types of clock/time processing modules:
- SyncE Slave: This module is used to obtain SyncE clock data.
- PTP BC: This module typically functions as a slave BC to process PTP messages and extract PTP information.
