3Com SuperStack 3 4400 SE 3C17206 Getting Started Manual

Also see for 3C17204: Datasheet Getting started guide Getting started guide Getting started guide Implementation guide

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3Com SuperStack 3 4400 SE 3C17206 Getting Started Manual Manual pdf 59 page image

Solving Hardware Problems 59■ Auto-negotiation settings are the same at both ends.Auto-negotiation problems will occur with 10BASE-T or 100BASE-Twhere auto-negotiation is disabled and incorrect cables are being used(cross-over or straight)Auto-negotiation problems will occur with fiber if:■ The Receiver (RX) and Transceiver (TX) cable connectors areswapped■ Fibers are broken■ Auto-negotiation differs at either end (a link appears at the ‘fixed’end and not at the auto-negotiation end)The Unit LED is flashing greenThe Switch unit physically forms a stack with other Switch 4400 units, butcannot be managed as part of that stack because one or more units havenot been upgraded to software version 2.0 or later. You must upgradeeach unit in the stack to this software version, which is available on theCD-ROM that accompanies your Switch.Port LED Status LED is flashing yellow (3C17205 only)The Switch has a Power over Ethernet error. You must press the LEDMode button to see which ports are affected and to see whether it is afault or a power budget issue. If there is a fault, then the Packet LED ofthe affected port will be yellow. If a port exceeds its power limit, then thePacket LED of the port will flash green. If a port has a Power overEthernet POST error then the Status LED of the affected port will flashyellow.Solving HardwareProblemsIn the rare event of your Switch unit experiencing a hardware failure,refer to the list of suggested solutions below.An expansion module is installed and the unit will not power upEnsure that the expansion module is fully seated in the slot and theconnectors are engaged so that the securing screws can be tightened.A fan failure warning message is receivedYour Switch has a fan monitoring system that will generate fan failurewarning messages. Fan failure could potentially reduce the lifetime of theDUA1720-3AAA07.book Page 59 Wednesday, March 17, 2004 1:14 PM