Front Of The Hub; Hub Status Leds - HP AdvanceStack J2610B Installation And Reference Manual

Hub Reference

Front of the Hub

Hub status LEDs

The hub status LEDs indicate whether the hub is functioning properly. For
further details on error conditions indicated by the Status LEDs, see chapter
2, "Troubleshooting".
Power
(green)
Activity
(green)
Collision
(orange)
3-2
LED State
On The hub is receiving power.
Off The hub is not receiving power.
Flickering ON while a packet is being transmitted. Normally, the LED
appears to flicker. In heavy traffic, it may appear on all the time.
Flickering This LED is on while a collision is detected on any of the attached
cable segments. If collisions are infrequent (which is normal) the
light may be imperceptible. In a network with heavy traffic, the
LED will glow and flicker dimly, indicating collisions are
occurring. If it appears on continuously (with no flicker), it is a
possible indicator of a network fault. See chapter 2,
"Troubleshooting".
Meaning of LED