Allied Telesis AT-S97 - Manual (Page 36)

Chapter 2: Stacking
36
AT-S85 and AT-S97 Management Software Versions
To create a stack, the management, stacking, and media converter
modules require Version 1.4.0 or later of the AT-S97 and AT-S85
Management Software. Earlier versions of the management software do
not support this feature.
A stack supports all of the features described in “Command Line Interface
Features” on page 25.