3Com 3C16753 - OfficeConnect Dual Speed Hub 8 User Manual

Also see for OfficeConnect Dual Speed Hub 16: User guide User guide Datasheet

Contents

16PROBLEM SOLVINGThe OfficeConnect Hub has been designed to aid you whendetecting and solving possible problems with your network.These problems are rarely serious; the cause is usually adisconnected or damaged cable, or incorrect configuration.If this section does not solve your problem, contact yoursupplier for information on what to do next.Perform these actions first: Ensure all network equipment is powered on. Power each piece of network equipment off, wait about5 seconds and then power each one on.Check the following symptoms and solutions:Power LED not lit. Check your power adapter connection.If there is still no power, you may have a faulty poweradapter which needs replacing with an identicalOfficeConnect power adapter. Do not use any otherpower adapter with the Hub.10Mbps Port Status LED lit for a port with a 100Mbpsdevice connected. This may be because the cable is not ofa high enough quality to carry Fast Ethernet signals (werecommend you use a Category 5 cable), or due to aproblem with the network card (NIC) of the attachedequipment.Link between the Hub and another OfficeConnect hubnot working. Check your connections; follow theinformation given in the “Connecting AnotherOfficeConnect Hub” section on page 13. It is likely that anUplink/Normal switch is incorrectly set.Port Status LED not lit for a port that has aconnection. Check the following: You are using a ‘straight-through’ cable which is properlyconnected at both ends, and is not damaged. Refer to“Twisted Pair (TP) Cables” on page 10. The equipment connected to the Hub is powered on,operating correctly and contains the correct type ofconnection. Refer to Figure 6 to compare the wiring of astraight-through and a crossover cable. Your PCs network drivers have loaded and initialisedcorrectly.