Allied Telesis AT-DC2552XS - Manual (Page 23)

Stack Installation Guide for AT-2552XS L2 Data Center Switch
23
LEDs
Here are the descriptions of the switch’s LEDs.
SFP+ Slot LED
Each SFP+ slot has one Link/Activity LED. The LED is triangular in shape.
The triangle LED pointing up shows the status of the upper SFP+ slot
while the triangle LED pointing down shows the status of the lower SFP+
slot. These SFP+ slot LEDs are shown in Figure 3.
Figure 3. SFP+ Slot LEDs
The SFP+ slot LEDs are described in Table 2.
Table 2. SFP+ Slot LED
LED State Description
Link/Activity
Solid green The SFP+ transceiver has established a
link to a network device.
Flashing
green
The SFP+ transceiver is receiving or
transmitting packets to a network device.
Off
The SFP+ slot is empty or the SFP+
transceiver has not established a link to a
network device.
LED Upper L/A LED
Lower SFP+
Slot
Upper SFP+
Slot