HP 10BASE-T User's Guide download pdf (Page 72)

Diagnosing with the LEDs

Most problems with the hub can be diagnosed using the LEDs on its

front panel. This section describes the normal LED pattern when the

hub is being self-tested, and LED patterns that indicate error conditions

on the hub.

LED Pattern During Self-Test

When the hub is first turned on and whenever it is reset, it performs a

self-diagnostic test during which time all the LEDs should be lit. The

LED pattern varies during the self-test depending on whether the hub

has an optional HP Ethernet SNMP Module installed.

For a hub without an SNMP Module, the self-test takes

approximately 3 seconds during which time all the LEDs (except the

RPS LED) are lit.

For a hub with an SNMP Module, the 3-second hub test takes place

first (all the LEDs are lit), followed by the SNMP Module self-test,

which lasts approximately an additional 57 seconds. While the SNMP

Module is being tested, the Activity, Collision, and RPS LEDs are not

lit (or are flickering if there is network traffic on the hub), and the

Exp Slot LED flashes slowly.

When the self-test completes, the LEDs then go into their normal

operational state or indicate an error condition.

The tables on the following two pages list the hub’s LEDs, their possible

states, and diagnostic tips to resolve any error conditions.

Troubleshooting

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HP 10BASE-T User's Guide Page 72