Chapter 3 Hardware Overview
MGS3520 Series User’s Guide
33
3.2 LEDs
After you connect the power to the Switch, view the LEDs to ensure proper functioning of the
Switch and as an aid in troubleshooting.
Table 3 LED Descriptions
LED COLOR STATUS DESCRIPTION
PWR Green On The system is turned on.
Off The system is off.
SYS Green On The system is on and functioning properly.
Blinking The system is rebooting and performing self-diagnostic tests.
Off The power is off or the system is not ready/malfunctioning.
ALM Red On A hardware failure is detected, or an external alarm is active.
Off The system is functioning normally.
10/100/1000 Mbps Gigabit Ethernet Ports (MGS3520-28 & MGS3520-50)
1 ~ 24
1 ~ 44
Green Blinking The system is transmitting/receiving to/from a 10 Mbps or 1000 Mbps
Ethernet network.
on The link to a 10 Mbps or 1000 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.
100/1000 Mbps SFP Slots (MGS3520-28F)
1 ~ 24 Green On The port has a successful 1000 Mbps connection.
Blinking The port is receiving or transmitting data at 1000 Mbps.
Amber On The port has a successfule 100 Mbps connection.
Blinking This port is receiving or transmitting data at 100 Mbps.
Off This link is disconnected.
1000Base-T Ethernet Ports (in Dual Personality Interface)
LNK/ACT Green Blinking The system is transmitting/receiving to/from a 10 Mbps or a 1000 Mbps
Ethernet network.
On The link to a 10 Mbps or a 1000 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 Amber On The Gigabit port is negotiating in full-duplex mode.
Off The Gigabit port is negotiating in half-duplex mode.
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