3Com 3CBLSF26PWRH User Manual

Also see for 2226-SFP Plus: Installation and user guide

Contents

4-2Configure a new userYou can use localuser command to configure a new user through the Console Port (see CLI ReferenceGuide).Forgotten Static IP AddressIf you forget the static IP address that you assigned to the switch, you can use display ip commandthrough the Console Port (see CLI Reference Guide).Solving LED IssuesThis section lists some issues that are related to the LEDs on the front panel of the switch.z Gigabit Combo Ports (RJ-45/SFP)z Link/Activity Status LEDsz Power LEDA link is connected, but the Link/Activity LED for the port is offThere is a problem with this connection. Verify that:z The switch being connected to is powered on and operating correctly.z The cable is connected at both ends.z The cable is not damaged.z If the connection is to a workstation, that the workstation's network interface is installed andconfigured correctly.z The correct category of cable is being used for the required link speed. Category 3 cables can beused for 10BASE-T operation only. Category 5 cable is required for 100BASE-TX or 1000BASE-T.3Com recommends Category 5e or 6 cables for 1000BASE-T operation.A fiber cable is connected, but the Module Active LED is offVerify that:z The fiber cable is in good condition.z The SFP module is correctly inserted.z A 3Com SFP module is being used.z The equipment at the far end is installed and correctly configured.The Link/Activity LED is on, but network performance is poorThe switch supports full-duplex auto-negotiation. If the connected device does not supportauto-negotiation, ensure that it is configured for half-duplex operation only. If the connected device hasauto-negotiation disabled or overridden, and is configured as full-duplex, the switch will configure thelink as half-duplex, causing a mismatch that will reduce network performance when data is transmittingand receiving simultaneously on the same link.Ensure that the connected device has either:z Auto-negotiation enabled, orz The ports are configured for half-duplex operation