HP ProCurve 6120G/XG Configuration Manual page 624

Network Out-of-Band Management (OOBM)
Concepts
Advantages allows centralized
management
Disadvantages can be affected by events on
data network; does not show
boot sequence
G-4
In Band
Networked Directly connected
not affected by events on
data network, shows boot
sequence
requires PC to directly
connect to USB connector;
networked terminal server
needs to be attached to OA
serial port
Out Of Band
Networked
not affected by events on
data network; allows
centralized management;
allows improved security
does not show boot
sequence