The other type of power sourcing equipment is the midspan, upon which the remainder of this presentation will focus. A midspan PSE fits in between the switch and the powered device. For example, if a company has a 24-port switch and only five PoE applications, power only needs to be provided on five nodes. This can be a very cost effective solution using single port power injectors on the existing switch. It also provides for an easy upgrade compared to the expense of buying and installing a new switch with PoE.