HP AdvanceStack 10Base-T Hub-12 Installation And Reference Manual page 7

Front Panel
hub status LEDs
and reset button
Optional AUI port module
ThinLAN
installed in AUI/Xcvr slot
network
port
chain ports RS-232 console port
(for distributed management)
Back Panel
power connector
vi
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twisted-pair port LEDs
twisted-pair ports
redundant power
connector for the Hub-24
and Hub-48
cable management
guide
cover plate over slot for
HP Ethernet SNMP Module