If we are talking about 3Com technology the 3Com Switch 4500, up to eight units can be operated together as a single larger logical unit to simplify administration. This is called stacking.Stacking allows you to add ports in a site or location increm...
http://www.ebrahma.com/2013/12/introduction-of-stacking-with-configuration-3com-switches/Labels: configure-stack, stack-configuration, stacking, stacking-in-4500-hp, stacking-in-hp