1-10
Cisco CGS 2520 Hardware Installation Guide
OL-31444-01
Chapter 1 Product Overview
LEDs
Power Supply Module LEDs
The switch power supply module LEDs are labeled PSU1 and PSU2 (on the switch) and PSU OK (on
the power supply module). They show whether power supply modules 1 and 2 are receiving power. See
Figure 1-6
and
Figure 1-9
.
Alarm LEDs
Console LEDs
The console LEDs show which console port is in use. See
Figure 1-6
and
Figure 1-9
for the LED
locations.
If you connect a cable to a console port, the switch automatically uses that port for console
communication. If you connect two console cables, the USB console port has priority.
1.
POST = power-on self-test.
Table 1-4
Power Supply Module LEDs
Color
System Status
Off
Power supply module (1 or 2) is not installed
Green
Valid input is present, and the output is within the operating range
Red
Valid input is present, and the output is outside the operating range or is not present
Blinking red
Valid input is not present
Table 1-5
Alarm Input LEDs
Color
System Status
Off
No alarm
Amber
Minor alarm
Red
Major alarm
Blinking red
Critical alarm
Table 1-6
Alarm Output LED
Color
System Status
Green
No alarm
Red
Relay closed, alarm present
