Allied Telesis AT-x510-52GTX User Manual

Chapter 1: Overview

38

SFP+ slots 27 and 28 on the 28-port switches and slots 51 and 52 on the 
52-port switches may be used as stacking slots to build a VCStack of up to 
four switches. For background information, refer to the x510 Series 
Installation Guide for Virtual Chassis Stacking. Table 10 defines the LED 
states when the slots contain stacking transceivers.

The Switch ID LED, shown in Figure 10 on page 39, displays the ID 
number of the switch. A stand-alone switch has the ID number 0. Switches 
in a VCStack have the numbers 1 to 4. Chapter 5, “Powering On the 
Switch” on page 69 has the procedure for verifying and, if necessary, 
changing the ID number of the switch.

Table 9. SFP+ Slot LEDs

Link/Activity

Off

The slot is empty, the SFP or SFP+ 
transceiver has not established a link to a 
network device, or the LEDs are turned 
off. To turn on the LEDs, use the eco-
friendly button.

Solid green

The SFP or SFP+ transceiver has 
established a link at 1000 Mbps or 10 
Gbps to a network device.

Flashing 
green

The SFP+ transceiver is receiving or 
transmitting packets to a network device 
at 10 Gbps. (The LED does not flash for 
activity at 1000 Mbps.).

Table 10. Stacking Slot LEDs

Link/Activity

Off

The slot is empty, the stacking transceiver 
has not established a link to a network 
device, or the LEDs are turned off. To turn 
on the LEDs, use the eco-friendly button.

Solid green

The stacking transceiver has established 
a 10 Gbps link to another switch in the 
stack.

Flashing 
green

The stacking transceiver is receiving or 
transmitting packets.