Out-of-band Management, including: Break Key, System Request, Serial Port, Out-of-band, System Console, System Management Bus, Null Modem, Pc Weasel ... Lom Port, Baseboard Management Controller

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More info: In computing, out-of-band management (sometimes called lights-out management or LOM) involves the use of a dedicated management channel for device maintenance. It allows a system administrator to monitor and manage servers and other network equipment by remote control regardless of whether the machine is powered on.