2-6
MAX TNT Hardware Installation Guide
Preparing for Installation
Understanding the shelf-controller back panel
Status lights on the shelf-controller back panel
The status lights (also called LEDs) on the MAX TNT back panel can be helpful if you
experience a problem, especially if it occurs shortly after power on. Figure 2-4 shows the
location of the status lights on the back panel and Table 2-2 describes them.
Figure 2-4. Location of the MAX TNT status lights
Table 2-2. MAX TNT status lights
Light
Color
Description
1
Green
On when the unit has power.
2
Green
On for any functioning shelf in a multishelf system, whether it is
configured as master or slave.
3
Yellow
Behaves as follows:
•
Illuminated when you restart the unit
•
Goes out after the unit passes its power-on self test (POST) and is
running
•
Blinks if a fatal error has occurred
4
Yellow
This is the multishelf alarm light. If the master shelf stops operating, this
light illuminates on each slave shelf for about 9 seconds. It does not
illuminate on the master shelf during a multishelf alarm condition.
5
Green
On when power supply A is installed and working.
6
Green
On when power supply B is installed and working.
7
Yellow
On when power supply A is installed and a fault occurs.
8
Yellow
On when power supply B is installed and a fault occurs.
9
Green
On when an Ethernet 10BaseT link has been established.
10
Green
On when an Ethernet AUI link has been established.
11
Green
On when the Ethernet link is active.
