ES-4024A User’s Guide
Chapter 3 Hardware Overview 45
To connect the power to the ES-4024A, insert the female end of power cord to the power
receptacle on the rear panel. Connect the other end of the supplied power cord to a
100~240VAC/1.5A power outlet. Make sure that no objects obstruct the airflow of the fans.
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 COLOR STATUS DESCRIPTION
S1
S2
Green Blinking The system is transmitting/receiving through the stacking port.
On The link through the stacking port is up.
Off The link through the stacking port is down.
PWR Green On The system is turned on.
Off The system is off.
SYS 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.
ALM Red On There is a hardware failure.
Off The system is functioning normally.
LNK/ACT
(Ethernet
ports)
Green Blinking The system is transmitting/receiving to/from a 10 Mbps Ethernet
network.
On The link to a 10 Mbps Ethernet network is up.
Amber Blinking The system is transmitting/receiving to/from a 100 Mbps Ethernet
network.
On The link to a 100 Mbps Ethernet network is up.
Off The link to an Ethernet network is down.
FDX/COL
(Ethernet
ports)
Amber Blinking The Ethernet port is negotiating in half-duplex mode and collisions
are occurring; the more collisions that occur the faster the LED
blinks.
On The Ethernet port is negotiating in full-duplex mode.
Off The Ethernet port is negotiating in half-duplex mode and no
collisions are occurring.
