3Com 2426-PWR Installation And User Manual

Also see for 2226-SFP Plus: User guide

Contents

If the Problem Persists 77The Link/Activity LED is on, but networkperformance is poorThe Switch supports full-duplex autonegotiation. If theconnected device does not support autonegotiation,ensure that it is configured for half-duplex operationonly. If the connected device has autonegotiation dis-abled or overridden, and is configured as full-duplex,the Switch will configure the link as half-duplex, caus-ing a mismatch that will reduce network performancewhen data is transmitting and receiving simultaneouslyon the same link.Ensure that the connected device has either:■ Autonegotiation enabled, or■ The ports are configured for half-duplex operationAll ports appear to show continual activity.There may be broadcast storms on the network.Remove port connections one at a time, waiting a fewseconds between each port. If the LEDs go off afterremoving a port connection, the device that was con-nected to that port is introducing an excessive amountof broadcast frames to the network. Some pieces ofnetwork equipment operate by sending out broadcastframes regularly.Refer to the documentation that accompanies thedevice for information on disabling the broadcastoperation.If the Problem PersistsIf the problem persists and the unit still does not oper-ate successfully, contact your 3Com network supplierwith the following information before returning theunit:■ Product number and serial number (printed on alabel supplied with the unit).■ A brief description of the issue