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Take the following picture as an example. The upper Vigor2925 is regarded as primary device,
the lower Vigor2925 is regarded as secondary device. When primary Vigor2925 Series is
broken down, the secondary device could replace the primary role to take over all jobs as soon
as possible. However, once the primary device is working again, the secondary device would
be changed to original role to stand by.
Vigor2925 Series User's Guide
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