Leds - ZyXEL Communications MES3500-24S User Manual

Figure 17 Daisy-chaining an External Alarm Sensor to Other Switches of the Same Model

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
PWR
SYS
ALM
10/100 Mbps Fast Ethernet Ports
1 ~ 24
(MES3500-
24S)
10/100/1000 Mbps Gigabit Ethernet Ports
1 ~ 24
(MGS3520
-28)
1 ~ 44
(MGS3520
-50)
100/1000 Mbps SFP Slots
Chapter 3 Hardware Overview
COLOR STATUS DESCRIPTION
Green On The system is turned on.
Off The system is off.
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.
Red On A hardware failure is detected, or an external alarm is active.
Off The system is functioning normally.
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.
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.
MES3500-24S/MGS3520 Series User's Guide
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11 10
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11 10
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11 10
Pin Assignments
33
3 2 1
3 2 1
3 2 1