AT-3612T Connectivity
36
Hub Status Indicators
Figure 36 illustrates the layout of the hub indicators.
POWER
—Green whenever power is applied.
FAULT
—(OFF under normal operational conditions):
❑
Stays red for a very short time while power-on/reset diagnostics are
run; remains red if a malfunction is detected during the
diagnostics.
❑
Turns red (on a Master module only) if the Master module fails; if
the Backup detects the failure, it takes over the Master function.
MASTER
— Amber (on the Master module or on the Backup when it has
taken over the Master module function) indicates the currently active
Master module.
Note
If the Master fails, its software may not be able to turn OFF its own Master
LED; consequently, the Master LED may be illuminated on two modules.
In this kind of failure, however, the original Master module’s Fault LED
will also be illuminated to indicate the failure. For diagnostic purposes, the
Fault LED takes precedence over the Master LED.
COLLISION
—This indicator will flash whenever a collision is detected
on any port.
ACTIVITY
—This indicator will flash when Ethernet packets are being
transmitted to any port.
Figure 36:
AT-3612T Hub
Indicators
MASTER
FAULT
P
O
W
E
R
COLLISION
ACTIVITY
STATUS
