ETC Congo Family v6.4.0 - Manual (Page 248)

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Network - Server/Backup
Backup consoles/Light Servers are used when it is imperative that control of the lighting
system be maintained in the event of a failure of the server. A Backup sends no data to the
lighting system until it has activated and taken over by converting to a server (either
manually or automatically due to loss of communication with a server).
It is possible to use a crossed cable with just two consoles. But if you are using Server and
Backup, you should use a Switch AND have a Net3 gateway (or similar) that is taking care of
the output of DMX. They can be connected as Server/Backup, or Server/Client. The client
can be used as a separate workstation in parallel with the Server, while the Backup is only
used for programming once converted to Server.
Server/Backup
The first system to boot will become the Server unless it has been set up differently.
See
Network - Backup Setup .
NOTE
If two Servers are active on the same network for some reason, the
header bar at the top of all screens will show "Warning: Dual Servers
Online".