HP J9981A Installation And Getting Started Guide

4-1
4
Troubleshooting
This section describes how to troubleshoot the switch. For more information,
see the chapter “Troubleshooting” in the HP 1820 Switch Series Management
and Configuration Guide, available on the HP Web site,
http://www.hp.com/support/manuals.
This chapter describes the following:
■ basic troubleshooting tips (page 4-1)
■ diagnosing with the LEDs (page 4-2)
■ forgotten IP address or password (page 4-5)
■ testing the switch by resetting it (page 4-6)
■ HP Customer Support Services (page 4-6)
Basic Troubleshooting Tips
Common problems and their solutions are listed in the following table.
Problem Resolution
Switch fails Power-On Self
Test (POST)
Troubleshoot using the LEDs. See “Diagnosing with the
LEDs” on page 4-2
Link light does not light when
a cable is connected.
Look for loose or obviously faulty connections. If they
appear to be OK, make sure the connections are snug. If
that does not correct the problem, try a different cable.

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