GE Reason RT411, Техническое руководство

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RT411 Chapter 10 - Appendixes
42 RT411
Appendix B – Application Examples
Application Example 1: Traditional and Modern Time Sync
The first example illustrates the traditional and modern manners to synchronize
devices, using a single time source: RT430. In the left, the clock provides NTP and IRIG-B
for legacy IEDs, and in the right, the PTP represents the modern protocol for time
synchronization. Using Ethernet networks, the PTP is distributed through PTP-aware
Ethernet switches and whenever a legacy IED needs to be included in a modern
architecture, the RT431 acts as a PTP translator converting PTP to IRIG-B or PPS.
Figure 15: Traditional x Modern Time Synchronization
Application Example 2: System Wide Grandmaster Clock
Using the RT430 along with GE JunglePAX is a great way to have PTP over a wide
network. The next figure exemplifies an architecture which a given application has a
local PTP Grandmaster clock, which commonly will be the Best Grandmaster Clock for
the local IEDs. Whenever this local clock became unavailable or does not represent the
best accurate clock, the local IEDs can count with a remote PTP Grandmaster clock,
which is called as System Wide Grandmaster.