3Com Baseline 2848-SFP Plus User Manual

Also see for 2848 SFP - Baseline Switch Plus: Datasheet Release note

Contents

32 C ONFIGURING THE SWITCHperiods of high traffic. Flow control is enabled bydefault.■ Speed Duplex – Sets the speed and duplex mode ofthe port. Available options include auto, 10half-duplex, 10 full-duplex, 100-half duplex, and 100full-duplex. For 1000 Mbps connections, see“Speed/Duplex for 1000 Mbps Connections” onpage 32.Auto (or autonegotiation), which is enabled bydefault, sets the optimum combination of speed andduplex that can be supported by both ends of thelink.■ Priority - Sets the priority of the port. Availableoptions include high, intermediate, standard, or low.If you modify any of these basic port settings, clickApply to save your changes.Figure 11 Basic Port Configuration ScreenSpeed/Duplex for 1000 Mbps ConnectionsYou cannot preset the speed to 1000 Mbps. To run aport at 1000 Mbps, you must enable autonegotiationfor the port. When autonegotiation is enabled, theSwitch will automatically connect at 1000 Mbps,provided the connected device also supports this speed.1000 Mbps connections are always full-duplex.Half-duplex connections are only available for 10 Mbpsand 100 Mbps settings.CAUTION: Before manually setting a port to full-duplex,verify that the device connected to the port is alsomanually set to the same speed and duplex setting. Ifconnecting link partners are left to autonegotiate for alink manually set on this switch to full-duplex, they willalways negotiate to half-duplex, resulting in a duplexmismatch. This can result in a significant reduction innetwork performance. If you are unsure of how toconfigure the speed/duplex setting, simply enableautonegotiation for the port.You cannot modify the speed/duplex settings of portsthat are members of a trunk or aggregated link.Supported SFP transceivers only operate at 1000 Mbpsfull-duplex. Inserting an SFP transceiver into a Gigabitport disables the corresponding RJ-45 port, even if nofiber cable is inserted.