D-Link xStack Hardware Installation Manual page 16

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xStack DGS-3120 Series Layer 2 Managed Stackable Gigabit Switch Hardware Installation Guide
S2
Fan
SD
Stack ID
Link/Act LEDs
PoE
A solid green stacking port 2 LED indicates there is a secure connection (or link) to an
Ethernet device at any of the ports. The LED blinks green where there is reception or
transmission of data occurring at a port. A darkened LED indicates no link on this
stacking module.
This LED blinks red when a fan fails. No light indicates all fans are working normally.
This LED will light green if a Secure Digital (SD) card is plugged in. When the Switch is
reading or writing, the indicator will blink green. No light LED means there is no link. A
solid red LED indicates SD card failure.
For standalone Switches, this will display number "1". For stacked Switches, this
indicates the position in the stacking box ID. The box ID is assigned either by the user
(static mode) or by the system (automatic mode). When "1" to "6" is displayed, this
indicates the stacking position of the switch. An "H" indicates the device was assigned
as the stacking Master. "h" means the device was selected to be the Backup Master. A
"G" is displayed when the Safeguard Engine feature enters the exhausted mode.
The Switch has LED indicators for Link and Activity. The LED will light steady green
when there is a secure connection (or link) to a 1000Mbps Ethernet device at any of the
ports, or steady orange when there is a secure connection (or link) to a 10/100Mbps
Ethernet device at any of the ports. The LED will blink green when a 1000Mbps port is
active, or blink orange when a 10/100Mbps port is active. The LED remains dark when
there is no link or activity.
Only the DGS-3120-24PC and the DGS-3120-48PC switches are equipt with a PoE
LED. When this light is on with a solid green light, it means that the corresponding ports
are feeding power to the PoE devices plugged in. When this light is on with a solid
orange light, it means that the port is in an error condition state. When this light is off, it
means that the ports are not supplying power to the devices plugged into the ports.
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