S1 And S2 Sfp+ Ports - Allied Telesis AlliedWare Plus Installation Manual

Chapter 1: Overview

S1 and S2 SFP+ Ports

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SFP+ ports 27/S1 and 28/S2 on the front panels of the 28-port switches
and 51/S1 and 52/S2 on the 52-port switches can be used either as
regular Ethernet networking ports or as the trunk in a stack of up to eight
switches with the VCStack feature. The switches of a VCStack act as a
single virtual unit, synchronizing their actions so that switching operations,
like spanning tree protocols, virtual LANs, and static port trunks, span
across all of the units and ports. For more information, refer to Chapter 2,
"Virtual Chassis Stacking" on page 57.
Note
For a list of supported transceivers, refer to the product's data sheet
on the Allied Telesis web site.
Note
The S1 and S2 ports are the default stack trunk ports if the switch
does not contain the AT-StackQS Card. To use the ports are regular
Ethernet networking ports, you must disable VCStack or use other
switch ports for the stack trunk. The ports on the AT-StackQS Card
are the default stack trunk ports if the card is installed.