HP J9979A Installation And Getting Started Manual page 22

Installing the Switch
Installation Procedure
2-8
The HP 1820 8-port switches also do not have a power switch. They are
powered on when the external AC/DC power adapter is connected to the
switch and the adapter power cord to a power source. The external AC/DC
power adapter automatically adjusts to any voltage between 100-240 volts and
either 50 or 60 Hz.
2. Check the LEDs on the switch as described below.
Power and Fault/
Locator LEDs
When the switch is powered on, it performs its diagnostic self test. The
self test takes approximately 45 seconds to complete.
Self Test LED Behavior:
During the self test:
• Initially, the Power, Fault/Locator, and all port LEDs turn on.
After several seconds, the Power and Fault/Locator LEDs remain on,
•
and the port LEDs turn off. Then each port Link LED is sequentially
turned on, then off.
Port Link/Act and
Speed LEDs
Port Link/Act and
Mode LEDs