111. Product OutlineSwitch-M48eG is an all Giga bit Ethernet Switching Hub with managementfunction having 44 ports of 10/100/1000BASE-T and four pairs of10/100/1000BASE-T port and SFP extension slot, one of which is selectable.1.1. Features Has wire-speed Layer 2 switching function. Ports 1 to 44 are 10/100/1000BASE-T ports corresponding to autonegotiation. Also their speed and communication mode can be switchedby configuration. Ports 45 to 48 can be used as a 10/100/1000BASE-Tport corresponding to auto negotiation or an SFP extension slotexclusively. Also their speed and communication mode can be switchedby configuration. All twisted pair ports support straight/cross cable auto sensing function.Simply connect devices with straight cables, whether it is a terminal or anetwork device.(This function does not work if the port communication configuration isset at Fixed or Link Aggregation. Ports 1 to 44 are set at MDI-X. (default)) Has a loop detection function, which notifies when a loop occurs withthe corresponding port LED and automatically shuts down the loopedport. Has a loop detection history function, which notifies when a loop occurswith the corresponding LED and enables a network administrator toidentify the looped port after the loop is removed. VLAN function allows free grouping of up to 256 VLANs Fanless design solves noise problem or fan failure. Use of LED indicator switching button saves power consumption of LEDlamps. The IEEE802.1p compatible QoS function is supported. Has an Internet mansion function, which ensures security between eachdoor. Power saving mode detects the connection status automatically andsaves power consumption to minimum.