Mode 1: BMC Snoop - This is the default mode when the IMM is not installed in the server. It allows console redirection on either serial port A or B. If the IMM is installed, it also allows the mBMC or BMC to monitor the bus in a non-intrusive manner.

Note: Mode 1 is the only mode that allows console redirection on serial port B.

Mode 2: BMC Takeover - The BMC takes full control of the RJ45 port. The port acts as if it has no physical connection to the motherboard and that the BMC has full control. In this mode, serial port B is disabled.

Mode 3 and 4: BMC Direct I and II - These modes are known as inter-chassis modes as they allow two chassis to be directly connected to each other. Only serial port B can be used for this type of connection. The modes are identical except for the physical connection on the motherboard where serial port A is connected to (DB9 or RJ45). Mode 3 communicates through the DB9 connector. Mode 4 communicates through the RJ45 connector.

In most cases, Mode 1 should be utilized.