IBM PC Server/Enterprise Racks 42S - Manual (Page 54)

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Hardware Maintenance Manual: IBM PC Server/Enterprise Racks
Making connections under power
Additional servers, can be connected to the selector switch while the selector switch is
running.
Failed devices such as a keyboard or mouse can be connected to a running selector
switch.
Note: When new devices are connected, the selector switch recognizes it and
configures it to the settings of the currently selected server.