Diagnosing With The Leds; Led Pattern During Self-Test - HP AdvanceStack 10Base-T Hub-12 Installation And Reference Manual

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.
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Troubleshooting
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