HP AdvanceStack Hub-16U Installation And Reference Manual page 19

2. Check the LEDs on the hub's front panel.
When the hub is powered on, it performs a self-diagnostic test.
During the test, all of the hub LEDs are lit for approximately 3
seconds.
When the self-test completes successfully, the following events occur:
• the Power LED stays on
• the twisted-pair Port LEDs enter their normal operating state
• If an HP Transceiver module is installed, the AUI/Xcvr LED will
display the state of that port
A Port LED stays on if link beat has been detected at the port. A Port
LED turns off if link beat is not detected. If you have an optional HP
AdvanceStack 8U/16U SNMP Module installed, the Port LEDs have
additional meanings. See the documentation accompanying the
module for more information. If all of the Port LEDs stay on after 3
seconds and you have not connected end nodes to these ports, the
hub has failed its self-test. See chapter 2, "Troubleshooting" for
information about diagnosing your hub.
3. After the hub has passed its self-test, you are ready to mount the hub.
Before mounting the hub, unplug it.
Installing the Hub
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