Mode Button; Reset Button; Power Connector - HP J9979A Installation And Getting Started Manual

Switch Overview
Switch Hardware Features
1-6

Mode Button

The HP 1820 PoE+ switches have one Mode LED per port. The Mode LED
shows either the port speed or the PoE status. In PoE mode, it shows whether
the port is configured to provide PoE power. The operation of the Mode LED
is controlled by the Mode select button. Press the Mode button in to select the
PoE mode, or leave the button in its out position for Spd (speed) mode.

Reset Button

The Reset button is used to restore Factory Default settings, reset the switch
while it is powered on, and enable Smart Recover mode.
■ Resetting the Switch — Press and release the button. This action clears
any temporary error conditions that may have occurred and executes the
switch self test.
■ Restoring Factory Default Configuration — Press and hold down for
over 5 seconds, the switch will then complete its self test and begin
operating with its configuration restored to the factory default settings.
Any configuration changes you may have made through the web browser
interface are removed.
■ Enabling Smart Recover Mode — When the switch is booting the Fault
LED flashes rapidly three times in succession. Within 2 seconds of the
third LED flash, press and hold down the Reset button for 5 seconds. Once
the button press is detected, the Fault LED blinks for half a second each
second until the button is released.
For more information on Smart Recover mode, see the HP 1820 Switch
Series Management and Configuration Guide.

Power Connector

The 1820-24G, 1820-24G-PoE+, 1820-48G, and 1820-48G-PoE+ Switches do not
have a power switch, they are powered on when connected to an active AC
power source. The switches automatically adjust to any voltage between 100-
127 and 200-240 volts and either 50 or 60 Hz. There are no voltage range
settings required.
The 1820-8G and 1820-8G-PoE+ Switches do not have a power switch, they
are powered on when the external AC/DC power adapter is connected to the
switch and to a power source. The external AC/DC power adapter supplies
12 volts DC to the switch and automatically adjusts to any AC voltage between
100-240 volts and either 50 or 60 Hz. No voltage range settings are required.
The 1820-8G Switch can also be powered on by a PoE PD connection to Port 1.