product description : 3com officeconnect gigabit switch 5 ports : 5 x autosensing 10/100/1000 ethernet media interfaces : 10/100/1000base-tx/rj-45 power : external power supply, included ethernet switching features : store-and-forward; full-/half-duplex auto-negotiation; ieee 802.1p traffic prioritization (priority queuing) ; jumbo frames dimension (h x w x d) : 22.5 x 108.0 x 85 mm weight : 162.0 g * five non-blocking, autosensing 10/100/1000 ports can be used as ultra high-speed links to servers or power users, or to connect the rest of the network through a central high-speed switch for bandwidth-intensiv operations * auto mdi-mdix on every port simplifies network expansion by eliminating most common cabling errors * full-duplex feature supports two-way data transfer, doubling the effective bandwidth of the network * jumbo frame support for reduced network load * compact, fanless design ensures quiet operation in small office spaces * connectors at rear help reduce cable clutter