Chapter 3: Subsystem Monitoring
Status Indicating LEDs
3-3
appropriate action to rectify the problem. Failure to act in a properly specified manner to
a system event (like overheating) can cause severe and permanent damage to the
subsystem.
3.3. Status Indicating LEDs
3.3.1 Brief
Overview of the LEDs
The following devices all come with LEDs that are used to inform subsystem managers
about the operational status of the component on which they are mounted. The ES U16U
has a total of 42 status indicating LEDs distributed over the active components in the
following way.
♦
Controller Module
– 3 LEDs used to indicate the status of different controller
module components.
♦
PSU Modules
– 1 LED each
♦
Cooling FAN modules
– 1 LED each
♦
LCD Panel
– 3 LEDs
♦
Drive Trays
– 2 LEDs each
LED definitions are given in the following sections.
3.3.2 Controller Module LEDs
The rear panel of the controller module is shown in
Figure 3-1
below. The LED’s are
numbered from
1
–
3
. The definitions are shown in
Table 3-1
below.
Figure 3-1: Controller Module Rear View
