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System Back-Up
1. How the IRC back-up system works
The IRC system incorporates a back-up system.
One of the satellites can be designated to serve as a back-up master.
When both the master and back-up master are in order, the system works in the following
sequence:
(1) Each satellite sends updated GLU/PBLU data to the master.
(2) The master receives the data, processes it and sends it back to the satellite.
(3) The satellite sends the updated data to the back-up master.
(4) The back-up master receives the data, processes it and sends it back to the satellite.
(1) Updated data (3) Updated data
(2) Processed data
(4) Processed data
Satellite
Back-up master
Master
(Processing)
(Processing)
If the master breaks down, the back-up master serves as the master after a master declaration
procedure is made at the back-up master. If the back-up master breaks down, the updated data
transmission to it can be stopped by a master declaration at the master. When the master or
back-up master recovers from the breakdown, it resumes its function as the master or back-up
master by the recovery declaring operation.