POE-GSH1008ATU builds in the 2 SFP port which is ideally for application which need longer connection. For some application, connection between two switches may over 100m. In this case, Fiber connection is necessary. POE-GSH1008ATU’s SFP can work with the SX or LX SFP module , thus, the connection distance between two switch can up to few Kms. Embedded high quality Power Module increasing reliability and easy to use．Power stability always is the first priority for the electric devices. IP cameras and Access Point are extreme concern the power source.