Shure Digital IntelliMix SCM820 Manual page 32

Do not connect the primary to the secondary port of the same device.
Redundant and Split Networks
The Primary and Secondary ports require dedicated network switches in Redundant Audio and Split modes.
Isolated Networks for Each Port in Redundancy and Split Modes
Redundant Network Recommendations
For the most reliable Redundant network, it is recommended to set up both networks without a DHCP server. Connect each
unit to a network switch without DHCP or to a router with DHCP disabled.
If it is not possible to disable the DHCP server, configure the mixer to a static IP address:
1. Disconnect the mixer from the network.
2. Connect the Primary port of the mixer directly to a computer.
Do not connect the two ports to the same switch.
Do not connect mixers together in a loop.
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