Allied Telesis AT-8088/xx (MT and SC) - Manual (Page 28)

Overview
28
Module Expansion Slots
The AT-8016/xx, AT-8024M, and AT-8088/xx switches have two
expansion slots. The AT-8012M has one expansion slot. Each slot can
accommodate an expansion module. You can use the slots to add
100Base and 1000Base fiber optic and twisted pair ports to the switch.
Note
For a list of the Allied Telesyn expansion modules supported by the
switches, contact your Allied Telesyn sales representative or refer to
our website at:
www.alliedtelesyn.com .