HP J9981A Installation And Getting Started Guide

4-2
Troubleshooting
Diagnosing with the LEDs
Diagnosing with the LEDs
The first section shows LED patterns on the switch that indicate problem
conditions for general switch operation troubleshooting.
The second section shows LED patterns that indicate problem conditions for
PoE troubleshooting.
LED patterns for General Switch Troubleshooting
1. Check in the table below for the LED pattern you see on your switch.
2. Refer to the corresponding diagnostic tip on the next few pages.
LED Pattern Indicating Problems
Diagnostic
Tips
Power Fault Port LED
Off with power cord
plugged in
**
➊
On Prolonged On *
➋
On Blinking
†
Blinking
†
➌
On Off Off with cable
connected
➍
* This LED is not important for the diagnosis.
†
The blinking behavior is an on/off cycle once every 1.6 seconds, approximately.

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