AirLive ES-4000 v2 - Manual (Page 156)

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ES-4000V2 features High Availability function. While there are two ES-4000V2 devices available onsite,
High Availability enables them not only to synchronize to each other but also to substitute for the malfunction
one in just no time. It ensures the enterprise an always connecting Internet access.
Definition
High Availability Setting：
„ This can synchronize the system configuration and firmware version between Master and Backup
devices.
Master / Backup Status：
„ It shows the connection and synchronizing status of Master and Backup devices.