Examples of devices that accept both 802.3af and Cisco power: Examples of devices that only accept 802.3af power: The presence of a gigabit Ethernet port on a powered device is a clear indicator that the device is 802.3af only. Because of the relative newness of PoE+, few devices require this level of power.
BHT or butyl hydroxytoluene is a fat soluble synthetic compound which is commonly used to preserve foods and cosmetics to slow down the autoxidation rate of ingredients in a product that can cause changes in the taste or colour.
The selection of an antioxidant or antioxidant system is dependent upon the configuration of the polymer and its final end use. Since BHT is a low molecular weight molecule, it is sometimes used with a higher molecular weight antioxidant to obtain a synergistic effect. Polymerization conditions, as well as end use performance, will dictate the antioxidant system and amounts used.