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3.2.2 External Backup Power Supply Connector
The backup power supply constantly monitors the status of the internal power supply. The
backup power supply automatically provides power to the switch in the event of a power
failure. Once the switch receives power from the backup power supply, it will not
automatically switch back to using the internal power supply even when the power is resumed.
3.3 Front Panel LEDs
The LEDs are located on the front panel. The following table describes the LEDs on the front
panel.
Table 2 Front Panel LEDs
LED
BPS
PWR
SYS
ALM
Gigabit Ethernet Ports
1000
100
Mini-GBIC (SFP) Slots
LNK
ACT
Chapter 3 Hardware Overview
COLOR
STATUS
DESCRIPTION
Green
Blinking
The system is receiving power from the backup power supply.
On
The backup power supply is connected and active.
Off
The backup power supply is not ready or not active.
Green
On
The system is turned on.
Off
The system is off.
Green
Blinking
The system is rebooting and performing self-diagnostic tests.
On
The system is on and functioning properly.
Off
The power is off or the system is not ready/malfunctioning.
Red
On
There is a hardware failure.
Off
The system is functioning normally.
Green
Blinking
The port is sending/receiving data.
On
The link to a 1000 Mbps Ethernet network is up.
The link to a 10 Mbps Ethernet network is up when the 100 LED is
on.
Off
No Ethernet device is connected to this port or the port is
transmitting at 100 Mbps.
Amber
Blinking
The port is sending/receiving data.
On
The link to a 100 Mbps Ethernet network is up.
The link to a 10 Mbps Ethernet network is up when the 1000 LED
is on.
Off
No Ethernet device is connected to this port or the port is
transmitting at 1000 Mbps.
Green
On
The port has a successful connection.
Off
No Ethernet device is connected to this port.
Green
Blinking
The port is sending or receiving data.
Off
The port is not sending or receiving data.
GS-4012F/4024 User's Guide
48
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Troubleshooting
