Stacking Slots; Figure 4: Stacking Transceiver - Allied Telesis AT-XS916MXT Installation Manual

Stacking Slots

The S1 and S2 slots on the front panel of the switch are used with special
stacking transceivers to create a VCStack of two switches.
Here is a list of supported stacking transceivers:
AT-SP10TW

AT-StackXS/1.0

Note
Stacking cables must be purchased separately.
The stacking transceiver AT-SP10TW is shown in Figure 4 as an example.
It has two SFP transceiver-style connectors and one meter of twinax
cable.
The switches of a VCStack act as a single virtual unit. They synchronize
their actions so that switching operations, like spanning tree protocols,
virtual LANs, and static port trunks, span across all the units and ports.
The two main advantages of stacks are:
You can manage multiple units simultaneously, which can simplify

network management.
You have more flexibility with some of the features. For instance, a

static port trunk on a stand-alone switch has to consist of ports
from the same switch. In contrast, a static trunk on a stack may
consist of ports from different switches in the same stack.
Note
This guide explains how to install the devices as stand-alone units.
For instructions on how to install the switches in a stack with Virtual
Chassis Stacking (VCStack), refer to the XS916MX Series
Installation Guide for VCStack.
Note
The stacking slots may be used as regular networking ports.
XS916MX Series Installation Guide for Stand-alone Switches
Figure 4. Stacking Transceiver
23