HP J9981A Installation And Getting Started Guide

2-8
Installing the Switch
Installation Procedure
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.
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.
Power and Fault/
Locator LEDs
Port Link/Act and
Speed LEDs
Port Link/Act and
Mode LEDs

HP J9981A Specifications

General

Management	Managed
PoE	No
Jumbo Frame Support	Yes
Form Factor	Rack-mountable
Model	J9981A
Layer	Layer 2
Weight	2.5 kg
MAC Address Table Size	16, 000 entries
Power Supply	Internal
Operating Temperature	0°C to 40°C
Ports	24 x 10/100/1000BASE-T ports 4 x SFP+ ports
Humidity	15% to 95% non-condensing